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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 magn7j/ :xjp7 at9i b)ugfmetic 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 inductionz2o*j0brwp 1 e xped0;j(:5lbe gqz s/ 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 t.e 5floq iz58jhe induce o e5qf8.lj5zid $emf$, 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 lo9q4gi j, lw;b ub96dggop of wire produces what kind of change ob4w q 6g;i9bgudjl,9gn 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 wirei.sx0*d- c,yy o;k b 0,s6q xmez5zsga produces what kind of change on the induced s0 mckei;,x0z5ob, 6. dzs-ysgq* xay$emf$, 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 fielx xnmmt*5i0i)rwg ; *pd 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 i *mqa :,*a2 krhbayxu)nduced current in a conductor will be that which tends to producem2qb u*aah:xa r)k,y* 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 table. Ajonk)yh-mh ,:48kf5iyrs xk; bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from 4os f5k;x :-kh) m yry8knhj,iabove)

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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. A bar magnet is held udu);353 h9jucu esh6y3 dj svabove its center with its north pole c3 s9j)y h6d5;h u3u3j evuduspointing 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 the magnetic fin/ us4t* vdk5peld vector points st4/ ktp*vnusd5raight up. The magnetic field vanishes suddenly. When viewed from above, what is the 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 th*rg 4lu .sqanig9be:g i-0b9 h7-gzfx e magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced cur a fgg.:q7bh-0grbezi i4-s *99gx nulrent 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 the magnezbd.fp)ky z7 0,hg1cwctmi-, tic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil )z7,pd0yfm ,ibzcw.- t1cg hkas 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 ta+w8o bn(bwdi 64myzk 1ble and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When vi 16yb4 w8io(mk+b ndzwewed 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 ol; c vo2ab1z (/u7ia0vmzb,zcf wire with the north pole entering first. As the north pole enters the wire, the induced current , aibzo 12clzvm;c/(abu7v z0will 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 y :h6hiw q*.a;vrqzf)vdl. )w constant angular speed about an axis whose direction can be varied. I )vi :)h;dvhfyqw*ql6wrza..n 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 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 ang., ;cn4x puknbular speed about an axis whose direction can be varied. In a region where;bpnn, 4uc. kx 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.z0ea)oz onnz bl,n -d1h c *+rb+g/mh:
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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 tl ek;qnpzfr (l,z,;d0 k4o ,mbhat 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 fiel qm+(1kit 1ycar kt,+rd. 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 in the east-west direction) is moved northward at con:gim- lo ixc/mfs/ 17ostant velocity through a ma1i 7c /l/oxmsgf -m:iognetic field that points 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 rotates at1yd76g5sa n1g/ jubaa 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 trans,x. x 2zpzyfq,6v nhcsb1dj 4*forms

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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 frz5lwu+ 3j,r itequency of thjz5t +ul3ri,we $emf$ 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 oh7w in viijrw3(2y , 1l*bu+ato

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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 thath2x1bj.d dg/ l

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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 seconda(iv ,z zfl(xhqy7gwqt0 5dy3:ry coil contains more loops than the primary coil then it isw, qgih(0z7 3dyzlx (5 vyq:tf 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 the7)2uwc: uj; f trunu:n primary coil contains more loops than the secondary coil then i7ruc::2nuw) j t;f unut 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 pown6ychgj*: *hnzc z --der 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 ci 6i ciporbcg msa1y58.* gw-j*rcuit,

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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 (t0e2jyq/ kwx in series to an ideal battery of constant terminal voltage k/y w(e2tqxj0. 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.v u 02a hw3jyx v)c-oa)lp2f7,srzco in series to an ideal battery of constant terov) chjurv.02), l y-7 asfoxwap2zc3minal voltage. 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 vrrop 22xl 834 )l.r8wi dkeyywith inductance 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 an ro0vwt .,7iqyd 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 connected in series todp2 n;yjix*yl+ozl82-2hudh f6p j1d a battery. The time constant for the circuit represents the time reql2n iz8;j hldd2do2f +puh p6y-yj1x*uired for the 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 idc(laz m9,a :ak.c.m xn series to a battery. The battery is suddenly removed from the circuit. The 9 a(mdmk, cazx..l a:ctime 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 the same units exc*uz3b 9zhxm- z(;ssst ept:

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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 powvq isa6zi)9 b7ri61prer 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 AC power supply. In (z rs a9kfbv;qca;m)n4-od s,this circuit, the current4zf, rm 9 ;asbsdqo-)acnvk(;

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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 facto.a8jpl9y8al xr when the frequency is tri98a .llayjp8x pled?

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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 thz:3q nm)k4qt7habuc, e AC voltage across an inductor is doubled, the inductive reactance of that inductokban 7t)qz: q4hmcu3, r

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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 inductor approaches zeroc8vhwgeo-h.c/d6 x3 *bbs / yp, the inductive reactance of t8/d/y*6- cvpxob eb.h cwsg h3hat 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. Injho z3mga6tir-ei0;j7 q.e7f this circuit, the currenqgmr60ahj73ezejoi- f 7ti ;.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 a*w(k(6r7p6edfak hc) f6 uiq6 grt )tdn ac circuit changes by what factor when the frequency6k(ftpq 67)fekt6ru6gwd a hcdi(*) r 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 otrg3e 2neu ,pmp -,q:voltage across a capacitor approaches zero, the capacitivn or,pp u,gm3-e: te2qe 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-ll 5fgoi bk7zmc o*(j.s m4b6 the inductor and capacitor in a RLC series cijl *obk4 76g5-l z fc(.mimsobrcuit?

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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 defined aozd 36oktl )3gtu u+wh 848dxhs $\cos M = R/Z$, 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 increases i5 kkt id)5j+awxpv3eap;+ vjo ,k5-jof R increases. When is ijx3+wvdj,jv kkot5;5ea5 +)kp oap - 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 impedance of the circui*yc;n/ )xbicn, vo2aauo s-;jt 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. y1eo78edn)l juwdcdo 9d78 s)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 capacitance both double in an LRC series circuit, the wzb3 gjh-q 5fx,t/ pu2resonangwu 5/2 bx hjq3,ztfp-t frequency of 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 driu*+i gk2: ;+1z wyorbm) s5ktxwa4aq pven 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 ocua.p9nzkf ) 67y2dl tzcurs 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 mpv k+dn)nn 8(p is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loovp8d np+(knn )p 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 rotating in a uniform7rb*6idkobwuy.yi;s +,f4 x e magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie6kf4 bd7y sbr.,;ow*iyix e+ uld 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 fieu w bbuh )c2x(t5* 83ba:n ilusxwz+(qld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are a823) buiu hw nl:+wtxx 5b szb*qc(ua(t 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 is reduced from 5.jqua2u ais4k 53bze izf /dg omcw-;gd;i 72$1.0 \; m^{2}$ 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 chyi a0un.,7 ycsuk:rwz88 q9z;oze i: vanges 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 fcxxg4( faux61 ewnu(4-sev o 5rame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil.5 e((-wxuux61c ov xfa s4ge4n If the field 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 15 turns and an are yj/a):ss1vph-y q+ fg)c-qel5 b 7moaa 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;d+x-tagi i +f :o;mky area $0.20 \; m^{2}$ 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 nw-o81y o*wvw2zp(dh m flies horizontally at a location where the downward component of the Earth'sh (w1dz -nywpoo*v 8w2 magnetic 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 lon:jfda w75 vcf1e+cix1j(ym 5vg rotates at a constant angular velocity of 2.0 rad/s abcf7ax1d5 :fmce 1(5yjwi vv j+out 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-secti5s p,2o-g/ juu i9dfrdbm.sv/w3(h e jonal 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 wirexi( z2ipf:s,w 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 igbp0am y7q b*0rqx8p5ts 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 perpendicular to the axis of rotation, what will be the maximum outp7rxp008 yaq g pbm*q5but 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 tg:.v.h/kz ah9kru/ a iurns 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 construct a simple o/h4if u g;6ljAC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. hioj;64l g/uf 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 l3 y3kndy(0p dmza ez9k7sh0( 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 .7+-j, m s cyr8yq(vm-o)qjyruu:x unresistance 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 6.00 W. The motor operates :u , ypco-5lvz5dqdy- on 120 V AC, and when running at full speed it generates uvco ydld-qp 5z5- :,ya 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 rflpy1 j:tr,uyr dz,81esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Whdjr8yzl1yu1 ,,: pfr tat 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 connected to a 24-V power supp ;mix1d ;+lluo nrd()bgon4 r.ly. The operating current is;1dlg(l)o4 nmdb. ri;n+ruxo 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 resistance 6.0 W/uqpe 46u:3ws-mip90h ailx ,v0vast is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bacv t4:a960aq il3p/ -msp0,suvwheuxik $emf$ 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 06pm9).jc;gbs030hqwvk s z5ihdpi u,2s zktto 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-turnp-9ep1 ti3qqv primary of a transformer causes 14 A to flow in the secondary. pq p9-1 v3etqi How many turns 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 necessary in a 110-V primary if the 24nv b-- a:3v sxv +0qbc1ukna1q-V seconda+ ana3-1vkq0 -bxv1vnu c sbq:ry 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 and a 2000-o+x:wqd6 3 .a c.lsjphturn secondary coil. If the cur:6xjda3 .sp+w .qloch rent 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 the pri56kgc,zoao5u tgw 0y6mary of a transformer. Assuming 100% efficiency, how many amps at 24 V can f g6ao506u5zoty ,gkwclow 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 750. z f)b--hy63ma/npd zi dfrw90 V at 10.0 mA. The prima9 pfab.3-n 6dfwdyhzzm )/-i rry coil 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 on its primary coil and 3 :kjky:r wx.w.00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the sex y :kkwj:.rw.condary?

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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 anjy,sx 6el-rv9 d 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondyxvs69,-ej l rary?

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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 tranq-c gjcgo( br/t hmo.35a: ,pjp2v+l rsformer 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 gpbjql r:g+/cop r3h(.2-voa,mtcj5the 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 its secondary has 200 turns. o:zyk:se 8gheu /kq6.If the input voltage to the primary isq e8zokey6h:g: uk/.s 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 1007z-vzp877y crt*rw ny turns and its secondary has 200 turns. If the powerrp7tnc * 8v7y7w-zyzr input to the primary is 100 W, we can expect the power output of the secondary to be (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 usv ug- )xxem53nz +r+)zubobhq*du23 hually stepped up to 4500 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 5 uq3xz xrb)h+*vd3unuo+m eb2z- h g)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 usu)d 31wp xfhm3yally stepped up toh pmfw1)dx33y 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.

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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 usuall/t4 q .(wonitey stepped up to 4500 V by a transformer and transmitted through tq(n 4oitw e./a power line of total resistance 1.0 W. Find the percentage power lost 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 gef 1loez.) g x//m9vtjhnerator 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 wie/ )9 1xtj fo.hzvmlg/th 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 lini xgmc7 6( kw97;idrbpe 50 km long has a total resistance 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 wigkripmxbw9d; 7(ic6 7 th 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.va: 3; rg :6ubac9)syu6;v s xdf0vlkm How much less power would be lost if the power were transmitted at 3000 V incs)d lxu:vs0vm6;bg f kyv:36 ur;a9 astead 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 4 o6prd.nzp7zs2o 9vq340 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the geneoorpp3v7 n9q6 z.zd2s rator 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 carriesfqre uh04 -a*hkj3h. l a current of 5.0 A. How much energy is stored in the coil's magnetic field?h.f3 r0e*hq-4 ujalh k

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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 a xqb,-h()-htluoj r z(nd an 18-H inductor. What is this circuit's timet o(x -(-z)ur blh,hjq 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 th3f :spd5 t5pst28wjmbe 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 placed into a 120-V AC outlet. What is the peak current+pr4wiooasr3c .tx4 m/5af;p t)j.k s?

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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. wz5b0hb9 c zkm+67jl(; c zcfu What is the resistance of the lamu;zb(5f b z0c k9h+67jlmzcwcp?

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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 a 120-V ac power supply. What is the peak .n r.+7 sxogmucurrentnru7+xm .. osg 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 powe7:u1v xbmj;5oai * pzwr supply. What is the power dissipated in the res:wa z1v; *7 5ixupmobjistor?

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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 resistor v ,/z.xibyv .wis $I = 0.80 \sin (240 t)$. 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 r,,h6 eoo(giti/ i9kjdesistor 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-Wxl,yjga+n33 - ojbc ipb y-,j( 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 reactanck;yuhg/j* d-be of 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 coil at 0:2,g hwvvlwh 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 re*jsyw574y xa qk:i z kthng*:0actance?

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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 inductive reactance at 1000 Hzgesh.k+ y 8 ayzvt.1f6?

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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 f *j1wold cq-9lt6z4fhrequency of 20 kHz is ap4w-chzl6t f1*jld o9qplied 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 soug4a-tlde. o ilcf+4ey7; zz. crce?

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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-m*z j6 .5nc(- tzagq;n j4dytqqF 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 i*3qnw p e br.fda:77pks needed 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 cap7m,zrdiy,f-ucr gycze* cq6:pod 0 r6e*+* lwacitor 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 cap af/s :u-mj5o84i dvw ugge,/xacitive reactance of a 0.010-mF capacitor be 100 W/:fj ,wevdg4ug mosi8 -u5a/x ?

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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 atrv - k,wm:;ppddhl xh8*2wa) k 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 resi.zr 837okr u y-owt0zrstance, 15.0 W inductive reactance, a0.or 8-o3 w7uyrz krtznd 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-Wid0k;g.v9 h1g jgub9u resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriej;d9i9k1gg0 gu .vubhs?

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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 1500l:sd(-5jsvx n Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacisslndx( j-:5v tor 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 witg3;:cs8 kgwpx 6gyzz)h a 20-mH inductor, what is the impedanp8zyc6 3g gxgws:;z k)ce at 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 conpp h0m:)ymysk84 .i7fztj m+tnected in series with a 20-mH inductor, what is the phase angle at 1+ kp7mhtf j.4:mz)8 iytpm0 sy000 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 coil and 1pu iysz 4nv w*b6f2q.7.0-mF capacitor for a total i wz2.nbp 7*sf yq46vuimpedance 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 followingu r-ibtlndz.cb,2ph( 0g u )4u capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 200dru(iclg tu 4b .),un-b0z hp20 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 450-9((eow8cjz av x41, cghdcno6mH inductor at 5000 Hz for a total impedance of 40000 ja c v9zw(1d8no cge(o,6 4hcxW?

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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 ar)3xjvq /+ wxjt 1.0-MHz for a total impedance of 150jr)xqwx3j+/v 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 serpu8dx46 3rnss x;t.q ug,.i+yn c;qmoies with a 20-mF capacitor. What is the impedance at 1000.6;r3 udp ,;+xtqcsnu mngy4i.xs8qo 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 nspvsb)-xkf1 - eeded in series with a 10-mF capacitor at 1.0 kHz for a total impedan1psfs--vk )x bce 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 serie- m9zox38k *wps glf4hs with a 10-mF capacitor at 1.0 kHz for a phase anxg439m -l8f*oz p kshwgle 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 1uw1 b e+xykpmd6,t40j.0 kHz for a total impedaywb ejkt0dum4x 6,1p+nce 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 pha *rvfpo 8)+owvse aw+rf)o *ov pv8ngle?

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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 resistvi ;87:yhu- 2oyml asbor, 20-mH coil, and 1.0-mF capacitor are c8m: 7yh- yvb iusa2lo;onnected 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)0qqg :m otdx,-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is cotxod ):q m0,gqnnected 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 capaci/k 9,ga mqu a+2a(0xotj be1yntive reactance 30 W, and an inductor of inductive reactance 30 W area t eno+u1y/29m qxj0,gkaa( b 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 angle nvdl l m2;d za2f9;,pbkf94ehfor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when con dfd4b, 2 keh9lnf lv;a9mzp2;nected 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 series9jbh + cuxvo., yfur4jf8.a)t with a 500-W resistor for a phase angle oy u.o9cf,b rju4 favt)hj.x8+f $40^{\circ}$ 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*ojdm: wlz:xf6 wdo0; = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order tof*w ;dwxd: lz:6jo0om 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 5 vxwf-bm4hc4p ln (o.series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W caomc4fh5w.4 (xl vnp -bpacitive 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 circuit5qr* q 9u 37fu:vf,dcxvsoeo3k e,2b t is $63^{\circ}$. 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 ann ske-5sz gl,/(g8heyj g5ia6 impedance of 60 W and a resistance of 30 W. What is thlg/gje5i,zn-s 8 6(e5k ghsaye 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 circfm.9 r0t fssq2+q3lwv uit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-fr 3+s0s.lmtw qv 29qfHz 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 a 1. -sam+sfic ;w2.zi mly8 :o7by0-mF capacitor and a 15-mH coil in series?-ymsi+bz w of.cm;sa7l82i :y

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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 i ejqhz -wx;;e2 f1(qjbn series with a 4.7-mF capacitor for a resonant frequency oj qx;-j1fbwhq ; 2(zeef 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 in2k-p+ l bacm1r series with a 3.7-mH inductor for a resonant frequenc+cml-bpk r2a1y 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 m+-ie s t4aai/hust be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of tai/h+i-s e t4ahe circuit is to be 1000 Hz?

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