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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 2ik. npk5)b 4omd+eb55tacjqmagnetic flux 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 indunw446 jngqr7qi d.sf8z6fl*r ction 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 *p3 39o+7j jmzo9eikr3q kclj produces what kind of change on the induced lqeoc3k33o9ij+ jmj*prz7k9$emf$, 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 loop of wir251,56zf h/4ptx.xw tec toqbtla 3eoe produces what kind of change onh b 6p o.o2415tex wfc35atxlt, tez/q 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 of change on th-*brn u s6v,c-hfgx c*e induced xf h gcsnucr6 --,*v*b$emf$, 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 magnwbl+yc ,:k:wl etic field 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,n-k ovyt4 3,af the direction of an induced current in a conductor will be that which tends to produce av3n,t4- kfoy which of the following 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 flat on a horizontal t1l ,(;sknv)o hmb)nvjable. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abonson) () 1v,h;jlbmkvve)

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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. l 5 5pvjtvs/;m A bar magnet is held above its center with its north pole point /5mltvpjs5 ;ving 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 regrpn/ bcupo8r* wwe)(:ion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the r8) w/oupw r:npbe*c(sense of the induced 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 region where the magnetic fieled2 z(dkf a(+7 *wtzvmd vector points straight up. z7 wfd+*d(vm2at( zek 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 regiuk-),(b +m ny pa-b txgija07mon where the magnetic field pa7 -(xtym)b0 aj+mbin-guk ,points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current 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 ever-increasims*,q o /h/4ypifkt jj0a6 ;vj5/zeaqng current northward. Two coils of wire lie flat on the table, one on either sidza ,5e/qk*j;4/p/misa0tof h6qj jv ye 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 )uxk4 k lggq1ijmb /5wiwa2+3uy :x/o the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed froo3 b) 25iiakwx/+4g kmuu w1yq: /gjlxm 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 rra0e45wrhdd h5 l98z xx ue,n.otated at constant angular speed about an axis whose direction can be varied. In a region where a uniform ma.8 xa5n9xhuedr045 zr e,dwhlgnetic field points straight down, what must be the orientation of the loop's axis of 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 wire is rotated at constant angular speed/dg)*x7j kt rz2y2nyn about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, zkjgd/xyy7n2n2 *)rt 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. h)3t.;kn4c-t -im e jjrk-bpr
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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 t3n: 9wd8r+0havc 2m1rp sgibqhat 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 magneua *q 9juk c+66eu4 jg hx6o(q7jrf1cctic field. 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 (or;jmo1jv;h.:l, ed kwp iented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the roj,hp.dke mlw;:o1 v; jd.

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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 rotkd3zu *x c3fo :x-t6cfates 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 transformwcw*3, ya2j y /kb.whds

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rot ud0g r/d(lj2jates through 60 revolutions each second. The frequency of td2( ul g0/jjrdhe $emf$ 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 device0tf2: amzqq m;29 8)j7amggs2 ammftp used 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 devio wd.hugbzpi; k fmr(,5b+ce7q/3 hn,ce 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 secondary coil contains more loops tha pa iuu; )z:lkzd8j+3fn the primary coil then ; az)+38f lujkpuz :diit 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 odtjx;-z.5 g icoil contains more loops than the secondary coil then ittdx o-izg.; j5 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 power iqen5l(b6 v 7tqnput

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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 cj4 gxjr0lrr5 -a w*dannx4xvhd286w7ircuit,

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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 to an ideal battery of cz6 -i,patid4cwlkdk: fk + /t0onstant terminatczdk6 i-f/dt +p,kk:a04l iwl 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 ser ,yjgu8:vp8z :5w:at9 pn yrpeies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage a w:pg:p8 5vzt8ar unj p:y,y9ecross 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 inductance L and resistance R is0is4wfsgkix0713, hj2 kzs xx 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 inductancef52iq1qc . v7sgh/uop: dm 4to 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 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 co),2u(me*3f-dwzub ek g z;yoonnected in series to a battery. The time constant for the circuit represents the time required for the currentmgo*)2u b; ywu(ze- ,fe zok3d 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 inbsz;0 /n ieuh( n(yyl*ductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required fuln(by nes/ (hyzi;0*or 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 following3 w qakhvd78+ldts.;c have the 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 uxg3e0jo+zytp +4 )va 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 AC pow- ne ut,)x1mgi-3bx eher supply. In this circuit, the currenee ubxht ) n1g--i3,xmt

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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 fy 1 *lg 62ghxygpn(o4iactor when the frequency is tripled4(l*y2 y ghoi 1xgngp6?

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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 inductor is doubled, thkv, f 6z z/0zbgomps0.e inductive reactancbzp 6govm/z. f zk,00se 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 voltag6x ;*6x id w+lja;byqipr2o h7e across an inductor approaches zero, the inductive reac+hro 2 w;xii ;*lj6a pyqb76dxtance 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 lok q ud/2.)d(mef.mb an AC power supply. In this circuit, the curreb m2)f .le(mdo/.dukqnt

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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 whatin/f,a-*s jj e factor when the frequency *e j-asf/,jn iis 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 across a cam fm+;9tl)oc ppacitor approaches zero, the capacitive reactancetpm9); cmfo +l 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 ind 1gql we/*ib;kou xs8 4;vvb4juctor and capacitor in a RLC ;j44 8;l1uq k/i* bxbevowgv sseries 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 xki2ik o +9omg z.b0h9cat;k*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 impedance of the circuit increl fn j9g0xeb-,7 uwzh6ases if R increases. When is this statezxgn 0l whf u-ebj,769ment 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 the5n* m.e;slsq kzz7lcg +c 3: g3kf0bma 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.j6/v; pdx1pb04kb fdg The impedance of the circuit 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 capacitanx39 bj+hyg q4kce both double in an LRC series circuit, the resonant frequency of 3khxb49g+yqjthat 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 xm)chjkbc 8- :zo )qf.that 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 RLgj4rt;qkxfbj a p2-8qq2 n+l(C circuit 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 rorq )fe.tj6 s4utating 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 f r .jse)4t6uqfield 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 rotating in a uniform magnetic fireii,:p*n-bw swgx8 ( eld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendw8xs p,i*b( ir:we-ng icular.

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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 ra,pj 3kqf/ 9qvf 5cevpva czc( +w6h73otating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane f 63(f ,apw k 739avc5qq/jchc+zvpev 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 loop ismi,a:zddw ,3 dts83ky 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 0;vcv b tm.b*w.p) bovhi-k3jchanges 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 a square frame with sides 18 cm. yqlay/ e 6u,f3A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.5ulyae6y3, qf/ 0 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 ayw ozlql j.qy61a23dn89 7aj2p2jpt w rea 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 areab(,/acdnaz) 9kmtv d+ $0.20 \; m^{2}$ 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 ;d e.rxofg* . adrl0+rhorizontally at a location where the downward component of the Earth's magnetic field is e..xrard* f +gld;ro0$6.0 \times 10^{-5} \; T$. 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 atw5hyc 97we;uf3j; bg n a constant angular velocity of 2.0 rad/s about a vertical 9n 7g;;bu5fcww eyj3 haxis 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-sy)45r-g s pads ,xfe+qectional 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 wire of areaj,tbg/*t/ugn8)chpzh. s nk ( $0.090 \; m^{2}$ 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. pes67 / :tplscEach loop is 12 cm long and 8 cm:cs6ppt7 sle/ 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 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 as:u /)fa2fx .vb 4zjmturns 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 consw8in6r,6e b uqtruct a simple AC generator with an output of 12 V maximum when rotat8w6iq ,uber6ned at 60 Hz. A magnetic field of 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 witve l7erd;,i,xh 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 have a resistance of 6.00 W. The mo;t t1mq7ot :hstor 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. The uh)m supp *4(8if x2gp3m/cpn motor operates on 120 V AC, and when running at funm2usp/c3u 4*)gpmp p(8fxih ll 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 co5u ,i8q(gam0y/t ckrmnnected to a 24-V power supply. The operating current is kr0t58y (gi,mcauq/m 1.0 A. What is the start-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 connecte bwubwsnt2nsf*im0 yp3r96a 24x:c. nd to a 24-V power supply. The operating current is 1.0 A at full speed. What isn s*2: purfn0x . bmwst2y9n 3bia6wc4 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 a 24-V p40zxuj 2yqlt/xj; ep+ower supply. The operating currenz4tly+ x;2 juxj/q0 ept 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 neededn+o)/gv o e0h:alpx*;ksb7rz 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:l0q vdst h8k 0yqe3m9ndary. How many tuklt9 ys v80q:0e3m hdqrns are in the 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 naj)x7 c.opfm:ecessary in a 110-V primary if the 24-V seco.7 :opafj xmc)ndary has 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 2kf9 nbr,unnb o r.)52flbwj;and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the n. bluw2 fno;9nkj2 r r,b)5bfprimary?

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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. A0 *nevhsz3:c7)mskpc8scxim v p78 4qssuming 100% efficiency, how many amps at 24 V can flow in t0:c8h*cxivm3p) semn ckqzs4 sv 787phe 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 ttc-4 qgil;ba9,2 xcfr ransformer provides 7500 V at 10.0 mA. The primary xtl9q c ria f-4;,cg2bcoil operates 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 turns oh wm*5,.l8ej o2m t /c:jswxkhacj;u*n its primary coil and 300 turns on its secondary coil.t2cxe w:/u m;5,k * 8jslcj*a.jwhmho 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 coil af cbnj61-p9y)u eysil -oy4 6n j7,hlfnd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what 4j ysp)li- f6cby e-16nh7lfj o,9nuycurrent 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 tra )9 jf8opwuopbg,w9 5b.xi 4gansformer 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 secondary to,gopgpa9)wo84bf .xw9 i5 jb u 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 its secondaork r4m 8nqyj, f2n29i0j .xeyry has 200 turns. If the input2m yqr exji8nf 0,ork4j29n.y voltage to the 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 trann f*k o0 4wvtzv3.pw-hruq4;nsformer has 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 (neglecting frictional losses)u0n.4wzk p h- tv;qf*3worv4n

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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 steppedil s)t4xin*xr, 2uny 9 up to 4500 V by a transformer and transmitted through a po) *2ux9yxntnr ,lsii4wer 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 voltage is usually35b+a(zm hcc; bpajb ph1(+l hvk.d8w stepped up to 4500 V by a transformer and transmitted through a power line of totam1b b(++a; wchpjpah3hc8bk( d. vzl5l 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 currh(g-zvl7y)q t 6ct4r rent 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 lzqthycv(r g6l4t7 -r )ost 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 resistanc5soygset01e 97 qe ;fnr12i voe of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the 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 no9 0ni2se7rt1 sovee5fq1;yg ot 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 ra shuj2/:-wv uesistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What phus2- juv w/a:ercentage 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 100h .y uokb:.+/r4iyt5s8)l samoti y*n0 V. How much less power would be lost if the po5i84o * tsyr uylbm:/ +y.tahkn.iso)wer were transmitted at 3000 V instead of at 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 lh0gj+cwc qu) dd)o 0lgy4ru7:yla b* 5ine with resistance of 0.60 W. To what voltage mugld*w4r +jc :) l7b0yhyu)a odqgc0u5st the generator output be stepped up with a transformer if the power loss in transmission is not 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 5.0yrbe*b0 4r5sjaj)1yd A. How much energy is stored in the coil's magnetic fiy1a*5sr ey brj4b)dj0 eld?

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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 i;byf +d6 (7qo*uanmn anductor. What is this circu u6n7 y m;a*no+d(abfqit'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 voltage x*z tkt18sfa*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. Whatd fvvjg1cwh 3c0:7 s3h 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-eu02hf m).(d/u ost fsV AC outlet. What is the resistance of the lamp?s o2uf.)ustmde/ 0hf(

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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 cw phxirlomw.m 0hy+g- w/c9kc9-*s .ionnected to a 120-V ac power supply. What is the peak current through the resistor?lm0 .-iik+9w/sw.phg * r ch- wyxmco9

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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-V1xnes6fbr; aq w*1ys- ac power supply. What is the power dissipated in the re b1wy -rseq1x6fs;*an sistor?

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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 j1t 3oqm9g)r/hwwmu; resistor 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 resistor itx 5lj 8hpt -5dtvj 52u8dpw2vs $I = 0.80 \sin (240 t)$. 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 resistor isg6 x3r+k3 euimjxk4 b8zp;be5 $I = 0.80 \sin (240 t)$. 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 y2iw q vu;jdk;t1 x8 ov)4ow;sof a 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 2.50-mH coi/ 6m) lmiaedct+ hnv61l 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:hasbtj0) p/u v 4x)tdhh +x6g coil have 14.0 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 157 W of inductuo9 5 ea, c9yslhq/z3give 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 when 120 V AC at a frequency of 20 kHz-f 5vb(zgua9c is appl ugavf9z5cb(-ied 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, 6o7ui dqf5opei6d d 82-0.0 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-:zdb,q9q( e1gu4oj 1fy s6kpfmF capacitor at 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 needed to have 50 W of capacitive rej f efwn-eqh.i3 :(n8bactance 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 capacitor havewb8 cx qc6-2 c-c7oojs 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 capacitive 2rowc+eb v7/e 2d+ kgr sg5l0hreactance of a 0.010-mF capacitor be 100 W?ek+g2l v rge 0/dshcob 2w7r+5

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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 Hz cq3vx .pm/ d0h+ 3uofvand 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 wyyy9: )lms8h;lwz mvf2 a9qy: ith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capafymyyl9 9hsaw28mv :lz;q): ycitive 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 10k;p* y;wc(i6w kci 87dlq*pc0 v6 uwca0-W resistor, 20-mH coil, and 1.0-mF capa6 *iw0;6k*8cd q;vcw kyia lupwc(cp7citor 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 angjhc7tn)-x,h+b / 5jh zdfw f9tle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in+cjhhzj5 7 9n t,fxf- dh)wtb/ 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 20hxtx /b7;,wnm -mH inductor, what is the impedance a;b,x7hmwx /tnt 1000 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, whartr 2q7lzd y;p07)q qbt is the phase angle at 1007rtq7z0dl)2 p;qyb r q0 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 circuit with a 20-mH coib1 i339wh+x0 sqg ofqil and 1.0-mF capacitor for ao0 ig31 +f i93xwhqsbq total impedance of 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 in series with a 100-W resistor a ls6 (z0sjnwao+4tg 0mnd 15-mmla+j4 gs n60z o0tw(sH coil to get a total 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 Hz dp +m9 clbb+n3for a total impedance of bdc n3pbm++l9 40000 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 )q t4 p0xsiyctuc-qigt2 + :n4put in series with a 100-kW resistor at 1.0-MHz for a total impeda042i)4pqtx i uc sqgtny -ct:+nce of 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 the im qm7c.1whmms4 pedance 7m mh.c s1m4wqat 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 witj+ )vh .81jhc5g) wfbob4 2f tqjz;oa*bly,wjh a 10-mF capacitor at 1.0 kHz for a total impedanc),lgzjj)fay5+vo b h twjb84f; .2bc1oqhw* je 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 capacitor at 1.0 kHz ft(t +y7uk kp5 fv9oty(or a phasfot7y k+(py9ttvu 5(k e 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 resistor at 1.0 kk lwj6-mgpxs+q03 p7uHz for a total iml pkm+jx73p g6 qu-s0wpedance 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 H u.;wzeag4zd) z. What is the pha ueaw4;gd.z z)se angle?

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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 res,pzb(0bk8 (wtpsrg xv i sj(-9 3sug-sistor, 20-mH coil, and 1.0-mF capacitor are connected( tsu js- z3grib bp(9(8sv0p,sk -xgw 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 consists of a 100-c*;b*e :ehv b pfl2ss5W resistor, a 10.0-mF capacitor, and a 0.350-Hfe25s* bphvs:;lc* eb inductor. The circuit is connected to a 120-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 capacitor of capacitive reactance 30 W, and ak5yw)qrre/ v8c:l t(47gou yve/e q c0n inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What currentuo 8yc/tqwelgeq47rc:) er v/5y(kv0 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 angle for a skft/me,y6iabt (h24 jeries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Haie/ k64b2,t tmf(jhyz 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:eh53h4 igs+u8al- 9b ,ql9fysz xzbb resistor for a phase angle of fuzl iy-b+3l q 9hahes8z:4b5g ,sx9 b$40^{\circ}$ 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 what j)i3 e4uk/b gsswd7o/frequency shodwb j3siueg/4)/7ks ould the circuit be driven in order to 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 with 12.0 W resistance, 15.0 h p)ghq( 1,lw dz9s9:u5 prnhpW inductive reactance, anr 9hunlph ),59hz( 1p:pqdswg d 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 iax4gq2+x)jclos c+ruw/ i0l 1s $63^{\circ}$. 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 impe 677uhdg:3gp lwfh xq.dance of 60 W and a resistance of 30 W. What is the power facto6uhf 7wg 3:.l qd7phgxr?

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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 circuit co7 xym0,,sp,2wi.q *lumr:(qf lp u g zyoy+,abntaining a 50-W resistor, a 10-mF capalwi m:mf* r+,2 ,xy gq(,lqupyzb uyo,0ps.a 7citor, and a 0.45-H inductor, when connected to a 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 freq-+w yr,te0f geuency of a 1.0-mF capacitor and a 15-mH coil in series?g,ry+e- 0 tewf

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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 wi )dyv-9 7nr; ruzjo;vqth a 4.7-mF capacitor for a resonant frequency of 10 k)q9 u;7r-zj ;vnyvd orHz?

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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 series with a 3.7-mH inductor for a resonant frbz5/tw1,wofysr;fro 9y 80cbequency of 1000 Hz ;rw1rwf cs9 5bo/o0byty8,f z?

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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 +t n2m7ls3pug resistor and a 40-mH coil if the resonant frequency of the circuit ip3ug +s 7lt2mns to be 1000 Hz?

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