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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autodiscover.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autodiscover.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic p7) 8nzeo(;oil qzy5pflux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induct b3 )zpha)ll)7k 2twfcion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on 9gjtzvl/3 u+uthe induced 9v ltz ujug/3+$emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magneo hnzswbc )e 1;/0b(cppkli(,tic field through a loop of wire produces what kind oflez,0si( b/cnp)1kc;bh (owp change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind ofi9j50fmf/pzgp 6 hx+g change on the induced f0j5mi pfx69zpggh+/ $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic v82u6ynlr .h( b3awbi*ox vvrl585ovfield an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conz0aoo:b my*f e 9.wk(r2zxf4 mductor will be that which tends to produce which of the following eff:emw f0xzfk o.rz*9oby2a m4( ects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ab3wf(gc)9c pj qove its center with its north pole pointing down. The stationary magnetq(pw9 j3c )cgf induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal t(b2 mtxs4bgd6able. A bar magnet is held above its center with its north pole s b(gx64tb2m dpointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where t2-u tu n857 1iuehvenahe magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induit 7vah ee2nn85uu1- uced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a regiq1 bh(uh)tg bxw:)y j-iz).ku on where the magnetic field vectot )b:1hkyhju)(uz gxw b)q.-ir points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where thep;s8n udq :/me magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced dn ;ue: p/msq8current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an everg biymq615fp ej ftk (2r6.:ez-increasing current northward. Two coils of wire lie flat on tm62itf e( 5gzrepk6b1yj:q. fhe table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. l:y.f auhi)o*b t 7d5e As the noyul. f) b a5o*het7:dirth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an ax4qg9zfm; na /qis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis z4n9f;mq/aq gof rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wdze*;e ,soxckr8 n 2y+ire is rotated at constant angular speed about an axis whose directiozydnr+8e2,xsk o*c e;n can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.i 2ziw*p d7bx9
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways trv,5mnrt nd82,e 8n:z95ldx/k eeqeo hat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fi ,b /0tceq:qsdeld. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented iy zr3c wlb/w e-5c-je/c/i+ xen the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pobcjw5/-c xle3z- i +ce/e wr/ytential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a cons q64/ u: xa1evs 1r vhv)k3l/jtp,kunztant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator7mb19*s 9nod/zexfmz dn2 r+ l transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency of yu7o+rwz1fy.24 pn b sthe ywz.1o2u4 7yprnb s+f$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device uum/m cnlfo885 zjs19)4rorb alkb s46sed to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device th6u pugtl,hj m;y. -jw nwf+.q9at

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops kc7 ct:jp(/kgh: . r0*yqzlyl than the primary coilrc/q*cpt.z y(kh g0:yj7: llk then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secg).3qsj :e jotm7* jlmb.h* iaondary coi oj:mjea3 .qms*g7*itbj. hl) l then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the.04 o;azg vtbt power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant wa3mz2c.rr ub 9),-g2vfrnbucircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in7 ;o utzephzz;z,0ek , series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltagek;h ezozutz7p,z;0, e across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal brj1pkfd) ,c(kattery of constant terminal voltagkd,fc pk )rj1(e. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductancedy pkq11cd1ny -4 kd foxf-2f1 L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected0t ,mbqqa8pw, to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seripz 9t);vud zes h4j5 ckj):6xfes to a battery. The time constant for the circuit represents the time required for the current to hj6kxcjzuf evds4; 95)p)z:treach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a bah/q6h5s a /u:mw-jpbz;/ jfebttery. The battery is suddenly removed from the circuit. The time constant for of the circu6hjqb 5a w hm;-/esu/:/jfbpzit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units ld 8-hd:qo e(ml/vi4aexcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected pv9pbf -r2,qx to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an;pl nu4jm -me: AC power supply. In this circuit, the currentme :pljn4m-u;

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when tz 4 8n.cbs:c1wt;utiuhe frequenc ;wbi1c 4:zcts.utn u8y is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inducte,el u1f935 /lwmg/ h4jtpeqi or is doubled, the inductive reactance of th34g9,/w/1jm uf pe5liltee hqat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across ann4b6fx.es ;wj inductor approaches zero, the inducti wjf64es;.xnb ve reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circui;;u)eyom+-i 5 r wkiaqt, the current-wyk m+ero quaii;)5 ;

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the 9ppe1 jt1fcp8iv f. au,(h3 ncfrequenic8un,apv1teh3p ffjc1.(p 9 cy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acrossimbifv53., g z a capacitor approaches zero, the capacitive reactance of that cvbm.g z53,fii apacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacie-m05c x rm/uutor in a RLC series circx-u 05/creum muit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit pe .fourq4qxv3gs2)cg ;o 92iis defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impe2ck9djt,us * tdance of the circuit increases if R increases. Wd2*tkc9 tju,s hen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedanceg61s-k w p:1to :sel +quq:kzf of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the cx /no/z; qmi*t p,gn/yj+ bw3xircuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and thx 25f :ckgw)5zy3.ipw q2 d2, kjbtu, mid8jyse capacitance both double in an LRC series circuit, the resonant frequency of kzp. y8:ud,ftg,bj2)5kd2c yqsx3j2miw5i w that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that -yuu 3ssxl3xxp 7;7bo is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occursbasphz l pic6kaw/.eb* n8,m:63dqc( when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatin34afzbk/ d 3wov(kavb 2no z*(j t3i;hg in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop an3h/ 3o(z2tkvaizfn vo db4wba(*3 ; jkd the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0e77r;v:sqc0 ei ry9mq;p xsj;.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectoqscy: m;;r;07x v7 eprqei9js r are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uni.w mr5ep6:t svwmgy/, form magnetic field of 0.20 T. Find the magn prtvw,ew5 yms .6mg/:etic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single lozkumox7gkacg6/ pn :5ebhu7::d v335fd 8 kpuop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from 3gi, 2fpnnpicdv k f8sjd:2h;n+)z 1j$4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire o *t bqey8;zt:xn a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the x8 zyt; eq*t:bfield changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with *fwyiyt3se:awfkuhb m6+l8n .+ +q 4f15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and arealki)zv 9:mqm1 $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locatvxck u;s*4j ,v imfc41ion where the downward component of the Earth's magnet*;s4fci ,vxuj1v cm4k ic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constanm: jy :ywokia. ;f)fyh-x6c hpw+ .pn0-r rm0ft angular velocity of xf-y+mf my0a.ynrp.6: :;rkjicwpwf-h)oh0 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectioo * 5s2a.orpdlnal area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of 4cjx3+lsghl 26 17zf vqn5owg wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectanj n 0x9vidfkt/: *i.bagular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpe iant*kbdvi 9f0 /.:jxndicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a*uxub4y) yy+ i ,z)fvv;22dg5pryjgdrea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wishhby8, /m idyk. to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field obki8 ymdy. h,/f 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxsjbzl 1lw 5qhgv7f 27:imum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The moto y 4ufi5e;va -0squ-73ga, dp k:edpffr operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Theta r) xa6jxu , lcx,:1.z.igzuc1wc0y motor operates on 120 V AC, and when running at full xgzl6 w., j:. ,i1) uct0zcyxra1cxauspeed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power v9 2a (jb1yz iui x1juitrm/b;u1h:3 ksupply. The operating current is 1.0 A. What is the start-up curryib uzi/j9jb3;( a11 x1u2:urtvmhkient?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6 kd ;/ r*m(yin8rykb0a.0 W is connected to a 24-V power supply. The operating current is 1.0 A at fulm d* 0n;(8iy yrkbrak/l speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to r8cnf9d 6,,aud zph/g uxn3l:a 24-V power supply. The operating currenfuc,d d3pl/a6 , hnxgz 8r9u:nt is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to red;woi l,8e eg2a/ fvp jm.9vm.kuce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secong;q 8j7x1km :(kbkrp es-tgg*3:hq cndary. How many turns are in tms*jgqk-kgebr(:p g 3h7 qc:x8 tn1k ;he secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary kx2+mnx c3jg/(t s w4ein a 110-V primary if the 24-V secondary has(m2 tckw /x3+xsjn4 ge 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 0v8dbt-s hpui u .bu7fppd,0; 500-turn primary coil and a 2000-turn secondary coil. If the current in the fv pb s;hpd, 0-7.pb0uudi ut8secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiencf xc jx31s;rw)y, how many amps at 24 V can flw1)sx3j fxr c;ow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign tran b+nlm*k2*:d 5 epz7qnmk(vol sformer provides 7500 V at 10.0 mA. The primary coil operates 7l2q+ z pe mkm*k (do*nvnb5l:on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 tu;os- f;gwagv yjmuj4yo 6,g45rns on its primary coil and 300 turns on its secons6 4,y u fyjj4awogm-o5;v;gg dary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coi argm0a+3m7k0x jlg 0xl and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the priaxx3jmgmk+00l7ra g0 mary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a trantu,d8u-ojh)l/ oq rzn p**9 wysformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the sn-p/ qyrtoj*, hd w9lo 8uz)u*econdary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transbedw+u*x hufw7++w 5zformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, w*x+ f +5b hwz+ue7dwuwe can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer h /coef2v/h neb1:mbgr/ 4dpn4as 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negf1/ 4g/pb2/cvb 4medrn:no eh lecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of zxw;s9j+ a bg8g,st+pbin *n5current at 120 V. The voltage is usually stepped up to 450pjxwb8s*g 5i+ tg+nnbz ,s ;a90 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The v4v) qun/t v/su8y a7 ku77iuejoltage is usually stepped up to 4500 V by a tjuakui qn u uy7t7es/84/7vv)ransformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuazq4:80p ) 7tzud xms/3owcwt35 qllib lly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lmc3 zp o:30 btsuwd)7z qxtl/4i5 ql8wost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A got(d2-2:5 pcoawh krlenerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line,dao:22(tck- w hrl5 po the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 5 *v4mifvf ak1W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissvm*f1 akvfi45ion line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would be lunyqd/b(r27 cp-ucsnmv4tw r .4.o7tost if the power were transmitted at 3000 V instead of at 1000wbunc7 dr u c4.-r/ytnvq2o(p7s4.tm V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitnhbx2 oo9k*)y1mpz i,04m5xnf 6hxsnted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is notkpx)x10 29oho mn6,f*mibysxhzn 45n to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the cje llcmk.(7s(ac h 8*coil's magccma7e ls8j(k*cl ( .hnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H qzgww.d(4:uy6cmfi ;v-mh3 m inductor. What is this circuit's time consmi( v ;.m-4wum d:c wyfghq3z6tant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit whdx27/o-iuu xc 8jg7an.gyr.b ere the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is place 2dxf,tt*3 o tglqg.k-tdix7dgw:8o:d into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the re;1*h4 j;kr pftt0aflk sistance of the lam;lft f pjk1ak04 *trh;p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is con*zj5x9uoad4j :: snq rnected to a 120-V ac power supply. What is the peak current through th sr jx*j4na9:duq:o 5ze resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. W6agxu+ir/v8 ehat is the power dissipated in the resv xeag+68uir/ istor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resi/l5:p v d5n:tv+irjd vstor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto5 triy:jat2u 7r is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resis/vt .)5irgdfoj53zol1*8mh cta c ;q btor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of ayp,aj nq4a4);s6jw wi 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2;tq deb1di5l 8.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive zsq0fo 05oq5+cwi2ca 25wi gwreactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of induct61z;5xymu sd)k/ qy8eza)v jzive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH y2-thlw,jw aw -a g0e8inductor when 120 V AC at a frequency of 20 kHz is a-j 0y-gal8w2w,eh tawpplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sour gcer3wj an/a;(t+ tf7ce?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor atrcak 2ng6j6n; 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is neejxhb*y51ft vob ,+xp5 k m3+iaded to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacagumehy)wh 93:5 ;caokhd96 opb3m,qitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitikwztna+w 3x,f zyz/.+ve reactance of a 0.010-mF capacitor be 100 W+akztzw,3. y w+ xzfn/?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through .jy gslor xhe) 8q5(l)c02ysj) igcr/a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resis-8zfz32thi vy tance, 15.0 W inductive reactance, and 10.0 W capacitiveft3 zi-8v yz2h reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance s)(fjt1*va jk at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitot )a f(1ksj*vjr are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, uj+i ckjf. *c420-mH coil, and 1.0-mF capacitork+jc.j cfu4 *i are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor 3i5 bgx+oj(aeis connected in series with a 20-mH inductor, what is the impedance at 1000(gbo xie5ja+ 3 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what j1s 7q6 zv j9n:wbrri6 ;hzzw2is the phase angle at 1000 Hj 9zq6iwsw7;jnrbrz 1h:6 v2 zz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a seriesez0 q+x86blt yr6x:sr circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hz?rrtz0 s :ylxx8be+66q

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following *kl m4bp:-a lhcapacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 lahlbk:4mp-* Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor amcs7, )rk jfu/t 5000 Hz for a total impedance of 40000,)usfr jk7cm/ W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100pfmx;(gcd57p qhz y j1( lf6r,d4zqi*-kW resistor at 1.0-MHz for a total impedance oq4x 7c lz,f(zd5( pghqry;j1 p6*dm fif 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is t3k nm(bce27 (oyxuys+ he impedance uy( +3kxe2oc bs7y(mnat 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with ac5qan 6,zeu70x1dz2mef , oho 10-mF capacitor at 1.0 kHz for a total izq2a xu 1ozcfdoe ,nh06 ,7e5mmpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needis0vsipd 4nlb0+ r *0ued in series with a 10-mF capacitor at 1.0 kHz for a phassirpsdn 0*04ilb u+ 0ve angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistoft:rao )n2 vt6r at 1.0 kHz for a total impedantto a) vfr6n2:ce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the) ,(r,*bjnetr i )wpzt phase angle )(rrtz,e pwt *nj)ib,?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-+-/e lwdorh9 kmH coil, and 1.0-mF capacitor are connected i- lkhre9+wd/ on series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF caph i*ej4xicl)3ib 0.x w-s3wldacitor, and a 0.350-H inductor. The circuit is connected to a 1c3l bw di)30.ejs4hlx-wi*ix 20-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a cdvw;g4*wpfrf 9srv 5;apacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flow vwp9* ;rrfvs54gfwd ;s in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a se4t;2rz-s9hqse uy e1 rries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-; zqy 2h-rseu49s ret1H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resiszo*nc c/q3qv*tor for a phase angle of*czc3 oqq*n v/ $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 m z/t0 +qfxgq6t*e 7+k8w5l s9xncrb8ln7nr oi F. At what frequency should the circuit be driven in order 7/qx xrt+90zk i n t ogr57fbcl+q6wn8 8n*lesto have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series cb/c)i;lh m0skcr)j h 5mj94e aircuit with 12.0 W resistance, 15.0 W indu09mr/li cc)a5sjh;h mb4 e)kj ctive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit iwb s/ ;mnti xp:wg(.. (uryziy1y3 7lis $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedancejk1 3dtjv 5o:nv ;q9mb of 60 W and a resistance of 30 W. What is t3bvqv mn1:jt d95o kj;he power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC c9sccxq(r6 l4zircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to x(lr cz q9c46sa 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a8qwhd:k- 5 zmo 1.0-mF capacitor and a 15-mH coil in series?o-h8 5m:q kdzw

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4ps n; d+jkgpllq)f87.m3*wu b.7-mF capacitor for a resonant frequency of 10 kHz? u7 bdwnmp+kl 8;)jlfqs*g3p .

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in s. 0(md4:(i. yww0kr fnbmaoaxeries with a 3.7-mH inductor for a resonant frequency of 1000r( i.k00n mda :(4awoym.xwf b Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in ser8ry1 vwpec l;ue8 )noe1fx7 k3ies with a 30-W resistor and a 40-mH coil if the resonant frequeno fkye 1;x83l87r1c)uven epwcy of the circuit is to be 1000 Hz?

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