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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  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 flux exceeph(. wx7 8ezlbqv*: kpt

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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 inductio de:dz5.i h-* t6ja cx toq,sw,z;oso*n 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 /hz bs2.su8 ggw;k ow8the induced gwg u88ko .2s;wsbh/z$emf$, 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 magnetic field through a l3vegdsj,viy b-+ v*c* oop of wire produces what kind of change on tgcve-3i+*v ,vyjb ds* he 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 whazs9vxsj+sbi;u 4 7x e m-(xn8mt kind of change on the inducede x ixz8nj 4 7us-m9x;b(+vsms $emf$, 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 f1y ydty uk9o2iasn: :.hh6 j*nield 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 conductor wilmt 8: m l3izn-:chq-ail be that which tends to produce which of the following :38mimqn-lc zi a- ht:effects?

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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 fla*v x+ 7uiw9 *eviyin-0v: xqpzt on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stizeviq0un: x* w9 7 vp+xv-i*yationary magnet 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 table.xsca-yem2 y8acw78 0)-dlpk zc.g ub/ A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coilz-28 -mwea7 sclxy/cuc8 0k yd.a)gbp , 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 the magnetic field vec((q8eyir: ; 2uowl nactor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as nol 2ur(cy;: 8i(wqeathe 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 region where thv l0lwpbh5*z6 tkd;t5e magnetic field vector points straight up. The magnetic field suddenly grows stronger. When vievlzp0t;6d *hl t 5b5wkwed 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 tab2y:y+y id:yd;n ptp *lle top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as th :y+*dp:iyndpyylt ; 2e 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 ever-in(u b:p1ydb g a lb vv0onn:-jigsb(5+1creasing currentd (g nsuy1bb +ni bv1o0jg:v5a-p:b(l northward. Two coils of wire lie flat on the 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 kkpq1zs*h 0uxi6(8v e first. As the north pole enters the wire, the hvki8e ps z(1 *uk60qxinduced 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 igc,q0k/-prwp s rotated at constant angular speed about an axis 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 of rotationpk, 0-gpw/ rcq 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 wire is rotatedo +cs0 /o+kbqveps.p4 at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orienq/b s.c0pk+o+v pseo 4tation 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.4 /m+ cfdvq.ui
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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 that6thkvqlcq*5t rfvpgz. c+-( . 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 field. Thu/c8. htx n*4bzqj 5zae $emf$ 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 in the east-west directionpqt.*l n;: bxn) is moved northward at constant velocity through a magnetic field that poin *xqt n.:pbl;nts straight down. Make a statement concerning the potential 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 rotabwry m*39 y1mftes at a constant 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 generator transfh3ul*c pwpt o79/b5 guorms

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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 tyw 3op ca7pryn:th:8y:+c-ubhrough 60 revolutions each second. The frequency of the rh ayo:+c-p:ny37bcypw:8 ut$emf$ 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 used ,y cg3/p28uea1 xudh2f1titm 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 devi3c6m 8.yt xz3:-hmr)cs fm mehce that

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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 secou:ll7 mu.)-b)a1t jc-xp cqzondary coil contains more loops than the primary coil thuu) p x.l: )ojamqb z-7-lc1tcen 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 ss9)mfgj e;+ioecondary coil then it is oj9)im;+fe g sa

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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 powekephx/ gi:j+v(mw 26l z8*fm er 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 circuitgzu ar*wm ki((b1fb2o ic,*b0 ,

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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 in series u; xr-c, 7oieh/sl0xp to an ideal battery of constant terminal/eo;ixrc,ls- u7p 0xh voltage. At the moment contact is made with the battery, the voltage 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 xr4(* *j z7(as fn p3gkzu oy1y-g- 1i4qwshvmbattery of constant terminal volqap4vzowu sn*- grf 1g(* 7h41yizjsx m- y3(ktage. 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 inducta+szq bv//zx3 vnce 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 resiskr 1fhpnpj ija/1l-) )nb.j8z 3h;brqtance 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 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 inimw u,n3 qcpdhm2h*;2 series to a battery. The time constant for the circuit represents the time required for t di; uw m2hnm*,3hqp2che current to reach

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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 bad,u w.a v-cej7ttery. The battery is suddenly removed fromjdcw.,v u ae-7 the circuit. The time constant for of the circuit 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 the8zdv j2sx65gt(rt at. same units except:

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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 to an AC power supply. On this circuit, qe.pr w .kg;hz3h-5gdthe 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 AC power supply. *0 yzj zy+sll; In this circuit, the current0;zlyj*z ls+y

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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 v py7 aoxc-,sftd5e.j+(0s fythe frequency is try(f 7c +doyj x.atsvep5f0s,-ipled?

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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 aat (s /klxcjb b gfv78+h8*n-wcross an inductor is doubled, the inductive rk/-f*8(bb w+nhsc xgtlvja87eactance of that 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 an inducahia207d(u-:f7zriy g)9be:w w ulmjtor approaches zero, the inductive react:uw b7-jygiedau2ra) 0wm 7z:lfh( 9iance 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 connec)5w*gwm y6 qzi fg2,xcted to an AC power supply. In this circuit, the curren5zw2g xc,m yqwg*f6i) t

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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 cha)kp+3bjscyt. +1y h fhnges by what factor when the frequency is triplehk+3j1s.yc)t f bpy+h d?

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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 across a ca ,dirz4ol; pewpf o:1-pacitor approaches zero, the capacit;o1lepr d iop4f:w-z,ive reactance of that capacitor

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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 capacitorf 2*4x;mn tptnijznaak2 q.g: i(v+s. 2 mbbj, in a RLC serie m.g2imn,2* x(qkt b bf+t;vzapsj.ajn4:n2is circuit?

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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 is definaes8 t5.xh f;u6p ylq-ed 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 impedance of the circuit incby8oi9h*( qefrpi 1z:reases if R increases. When is this statemr pqi 19ie8ybzo*: fh(ent 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 impedance of the circuit increases-0c uxi1-vbn j3 ;xvwr 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 circ; )xg bs)s g2pgg(1;+ferwy bguit 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 the capac.d(v vv/jdl7 ihkf.m5itance both double in an LRC series circuit, the resonant frequency oj.i(hv7/m5 dfk .ldvv f 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 is driven by an AC applied voltage. At resonancjhs ycfazobs t8d0+7* g ,ob0,3.woqpe,

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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 circ,*4vjzh3q x*v hrq*vwuit occurs 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 rotating in a uniform magnetic field of 0fe6ota-/ c y1m,gunhp e)3 x(d.20 T. Find the magnetic flux throoyxnch (3/16te -meu)gdp,f a ugh the loop when the plane of the loop and 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 0.10 m is rotatin4wupbsp,e17b7 uz /cpg in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thecp4/z p,b bwu7u1pe7s magnetic field vector 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 uniform magnetic.4/xonr xmk10(qcv q)sa 6v3te wqoj5 field of 0.20 T. Find the magnetic flux tsv/q6vrjx k n0.ew aq(q5om3 c14o)xthrough 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 vgg z*d/)d7mf* ev5qqkyxt+8loop 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 chp3bbocbvfnj6kt 6 pyvpr8 3, ,0bn;n6anges from $4.0 \times 10^{-5} \; Wb$ 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 on xi6;t3kd ki 6fa square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field if6di3 6xkk;tchanges 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 15 turns and an area ow;2wea,xax 4r ua1d+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 1lkwut-7xn(c;pd 37ks 2nkq -;j hoqoarea $0.20 \; m^{2}$ 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 o.bw( 3cr6c pmwf 60 m flies horizontally at a location where the downward component of the Earth's magne.w(wc b p6r3mctic 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 moltu2c p l(aq*4kxr+ xc3/b o; long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through 4ootkx x cla(* c+rpq/ubl23; 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-sectional arqz*mge..*t oe ea 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 consissr m-nl1q -jf1ts of 100 turns of 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 rectangular loops on its armature. Each lo8suc: ,6nljcjw4 f g4rop 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 perpendicular to the axis of rotation, what will be the maximum output6j4 f 8cgjnlwus,c:r 4 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 tur2kmzfsh ; apx;.6r-e ;* gmimj7 f2jzcns of 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 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 wish to construcf,fcsw y 6c93o*gs, rxt a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is s os3 g,f9,*wy6xrfcc$100 \; cm^{2}$, 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 genp/ bt oelqd)zz 67n1bvc.3y:xerator with a maximum $emf$ 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 hav.pq v6(hud -aie a resistance of 6.00 W. The motor 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 6b0usfr:5tq h / r;usc4x6g6q c.00 W. The motor operates on 120 V AC, and when running at fuu:ts4 /gqh;6cr0c6 5fqbsx rull speed 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 cony wuk,3i5 -2kyzhjo0nnected to a 24-V power supply. The operating current is 1.0 A. What is the ,kyi yj2 0ohu z-n53kwstart-up current?

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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 6.0 W is connected to a 24-V o zlxwdc3(++j6d) icdpower supply. The operaix3zc)+dl w(d c 6+ojdting current is 1.0 A at full 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 resxon/6-85if z t,jt hspistance 6.0 W is connected to a 24-V power supply. The operating current p6/jno8t hi-zx t,f5sis 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 is2iz*v)w g0ud t needed to reduce 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 seco,lv.kz , c8-v w)u vv6uzod-npndary. How many turns are in the secondarn,-)u-8pwv. zo,v v cvduk6zl y?

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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 + : fq 1zhbuuwu1w:1ebare necessary in a 110-V primary if the 24-V secondary hazq :u:uu1hefwb1w1+ b s 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 500-turn primary coil and a 2000 yn3mqt9bl 1t8-turn secondary coil. 3nqb198tmyltIf the current in the secondary 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 )l7kkat;v yg1 pzr1rhbtu4.* k zz.k/ the primary of a transformer. Assuming 100% efficiency, how many a.y ur7k*/r ;ztp kazbz4)1hlgkkt.1vmps at 24 V can flow 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 transformer provides 7500 V at 10.0 mA7p x 1silez :ylis, ,8 *xsfbpu+:c5ga. The primary coil operates on 120 Vx pzi8s xl:s,*s g 1,i:eyp+cb5 u7fla. 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 turns on its primary coil an7op0y:zanu /nd 300 turns on its secondary coil. If 120 V at n7oa/p yn:z0u 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 o184eckgxx6l gn its primary coil and 300 turns on its secondae46x81k glgx cry coil. If 120 V at 2.0 A is applied to the primary, 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 transfoksu/5(v,qddkzvk , j4rmer has 100 turns and its secondary has 200 turns. If the input current qd /v ud4vk(k5jsk,z, at the primary is 100 A, we can expect the output current at the secondary 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 transformer has 100 turns and is3//0 g mi5qwakrrh /lowm,kci o(+,l ts secondary has 200 turns. If the input voltage to 5 rr (ol0wo,iw/3 q ms/clgk km+a,i/hthe primary is 100 V, we 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 has 100 turns and its secondary has 200 turns,kb.c4de 9guds3tuh4 . If the power input to the primary is 100 W, we can expect the power output of the secondary to be 4,g. d49h3d t ukseucb(neglecting 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 current at 120 V. The voltage is usually steppedtd,.li mm , uw;/ahw n9i2;vir up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of wm di. , h,iw9l2r/tmvnaui;; 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 curren w na(y)yis*3jt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmissio j*(w sayi)3ynn 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.ik pl7,e/ak*su+ibsq 2l*9* 8nb clri The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepp*sa likln2 9lpeb s,/ q*+ir*ki87cubed 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 r5rwg6mxxxd/ sp+ jea :aoc393esistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of /ecax5: xm+opasg9d3wj3 6 rxthe transmission line, 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 tcv(ca k;4n gp1y .uflyhk8 /f(otal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of th;a(1f uc (/cyh klpf.yk8 vgn4e transmission 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 )y-fzt: oy-q ua 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of af-yy-uo) t:qz t 1000 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 transmitted on a ling,g ; sxlbu(hif 9vtm x3q51k1e 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 not to exceed 0.010% ,svx1q ( 5ft31l;gxhgmb kiu9 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 st 0. qaq013bp7zokar0.sqvfx f ored in the coil's magnetic fie.qoqfv0xk3017 srq baa zfp. 0ld?

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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.u/tlxv+ )sn (rq z0bu 6.0-W resistor and an 18-H inductor. What is this circuitx utzs0quvl(.r)+/n b's time constant?

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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 where the rms. kgid)/3 urtdwe +w;b 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 placed into a 120-V AC outlet. What is the peak +ihpc9,..oa ;r8pki: jt g cbdcurrent?

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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 3yw(.rnpmxe5: ,w6r, a tthgo into a 120-V AC outlet. What is the resistance of the lampe(,t :n3xmg o5r y.w6har wt,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 connected to a9 j(ou-vp com4 120-V ac power supply. What is the peak currej4com p (9vou-nt through the 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 suz0ltwjn9 2lb v7zx6td1rce9 + pply. What is the power dissipated in the restz cvx291e6bdr79nwt +lz l0 jistor?

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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*p1am8*ez(otpw v 1 lmstor 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 azcx2:mz92l cl*io;a 50-W resistor 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 a6x*dd+p+gb /jgnrn*m 50-W resistor 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 a 1.0-mH induujnq.9r .nga) ctor 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 2.50-mH c)hxoxt h4x (7gnw*8 duoil 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 1gry8fby2qau4s/; l/ e4.0 W of inductive reactance?

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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 q o5n,6aj 16 yf.-rvplobk1zk157 W of inductive 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 inductor wj/bf3 -e fq2 5dgkqk-j 71yxpchen 120 V AC at a frequency of 20 kHz is applied qkg/ 3c7f d2f5-y1pxj-qje kb 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 duen3/i860pf f33 91k1m kxventcindu 5 vpn r,kq to a 110-V, 60.0 Hz source?

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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 at 10 kH 4 rx18 wyauxe9s75opoz?

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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 needed to h1,. ;2vk 2:qshtlfyu7z) wkz ,qnrwuwave 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 te04bm 2m-iiy h8 d,yy10-mF capacitor 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 wil - x(yj+bl a/d1tvmq2 hr)o(bsl the capacitive reactance of a 0.010-mF capacitor be 100 W?r) hxjm (la bodsq2y+vb(1 /-t

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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 a 0.0010-mF capacitor at 1000 yf2t /09ax o0ptn6aq cHz 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 resivr+ 2t0,ti*w nu1fc gqstance, 15.0 W inductq*+ fi0rgtw t 2nvcu1,ive reactance, and 10.0 W capacitive 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 at 1500 Hz if a 100-W resistor, d u+(t.6amknz20-mH coil, and 1.0-mF capacitor are connected in series? a. nk+utdmz(6

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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, 20-mH coil, and 1.0-. +3df l4 b6/nfr:vxolsu:zixmF c3ix:osnu+l/b6z :frd. f4x lv apacitor 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 is connected in series with a 20-mH inductrfty,*joxr -(9 ej*j wor, what is the impedance at 100*9(f yx-rrj* wt,joej0 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 inducto3jg 2p p1aazbv 1q/-t83ycu rnr, what is the phase angle at 102y bpa-t 8cpq/n3 g13zar uv1j00 Hz?

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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 series cy wq1 ibzovkeh .(1g*.ircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance (heb.vw ik*yoq1.1gzof 100 W at 1500 Hz?

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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 capacitances is needed ijx v;epug. yui;qwhq 474y6c -n series with a 100-W resistor and 15-mH coil to get a toy;g6 ;ce-vquhqi 7 up4xyj.4wtal impedance of 110 W at 2000 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 at 5000 Hzd fn4s tftv891mw (-d1vqb5th for a total impedance of 400ndv4 t(8 9tv-fdsfh 51m1w btq00 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 100-kW resistor at 1.0)+gfv+8e*sm,yg+o)wn m kj nk-MHz for a total impedance j o,m*ks+gnyg)f+ nvw)+ m ek8of 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 withn00 0ioc:cnbi.)eaedqxrj 0 8 a 20-mF capacitor. What is the impedance at 100n)b q: 0o0aj0r8x0cc nieied.0 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 needed9hiwm7g1 on: x7mbpv)-dc +m r in series with a 10-mF capacitor at 1.0 kHz for a tota vc 19mp )i+rg7nod: wmx-m7bhl impedance 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 needed in series with a 10-mF caparzmoie*39e-vnbex ke i8:)d/ citor at 1.0 kHz for a phase ange8)dxn*ie/mi - eo zrek3:v9b le 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 resistor at 1.0 kHz for a tothk -va++ 5dij+7d 6ha7mrjgkbal impedance of 45hjkig+ad77b+5h6 m dk-vr+ j a 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 a9. t6 s;zrbm wj6khf9d 100-mF capacitor at 120 Hz. What is the phase w6 ;zhb9rf9.mkjd6 tsangle?

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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-W2w 5y.i 6ebw,s6uqce1lva;o k resistor, 20-mH coil, and 1.0-mF ob ;wc 6ky6 i,v.5uaeeq12lws capacitor are connected in 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 rsf(.:bc:e;y eyg 2h s3uupfk n2(r7dconsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What ;y(cf3.f72:u rys h(k ebdgp2:s ernuis 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 capacitor of capacitive reactance 30 W, and an i(.+1h yohkw aonductor of inductive reactance 30.ok( wohy1h+a W are connected in series to a 110-V, 60-Hz power source. What current flows 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 anee;w;y53ekb ung :4y dgle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sub eud4;wgk 53 :yeeyn;pply?

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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 resistor for a phase +4l:jjnw hoya b;).eu angle of uwl;hj y) jone:4ba+ .$40^{\circ}$ 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 mF. At wha ttu7:sw0e5j *+npddg t frequency should the circuit be driven in order pj*t7s:etgd +5n 0duwto 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 circuit wixikjunkzbg.;s uc9/) q 0e+0q;d(kjxth 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive res0dgqkbcn(9. i eku +u;/0kjzqx;jx )actance, 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 is +i+mmn qq .+ctopdv4;$63^{\circ}$. 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 impedance of 60 W and a resistance5yesbtvjfb u-8xqi i+;/ ,) rg of 30 W. What is the power,8xe/b5yu- f;gtrb ivq i)j+s 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 factc/2q8vhk , wpvor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to akh/2w8pvq,c v 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 frequencb p szee*0/3 mwc5s8vfy of a 1.0-mF capacitor and a 15-mH coil in series?ee* swfcb3 85/szp0mv

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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 4.7-mF capacitor for a resonant fre/*bpca5pgnpo2 ql 4s0quency * 0n2 gpl/sopcapq 5b4of 10 kHz?

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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 t9r:gn/njo8 2 2 dkfbp)j 3mmvseries with a 3.7-mH inductor for a resonant frequencm: fn2r29vmtgd)n/ b8ojj3k py of 1000 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 series with a 30-W resistofu.nhj; :x ,vhr and a 40-mH coil if the resonant frequency of h j:vn;x.u,hf the circuit is to be 1000 Hz?

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