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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 ofkft;yxx.zse((khcc;1b* + h n magnetic 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 induction states that the r /+esar(w8;df(szk b$emf$ 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 prozigh*9y5dk )4ckr3;ouh-d tnduces what kind of change on the k54)o* it3hdg-c9 nrhyudk ;z induced $emf$, 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 ar(+8mmjb jn*v una+p8 loop of wire produces what kind of change on the induc8 8 pj+bn +mnurja*mv(ed $emf$, 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 loby7ir,m, - p,r;xkt0 yuzp1 lz-) jlzaop of wire produces what kind of change on the inducedmp7;-irlap j,0 y bztlu, zx)y -1kr,z $emf$, 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 fi6b/b/ emcbv t7y4 q,ib:sax:ql9 xk4i eld 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, t gzc*an(.nq5x fyl.: fhe direction of an induced current in a conductor will be that which tends to produce whichcy5(g: xq nnf. al.zf* 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 7shgjsh qpw)q)t;02t flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from ab7 j)g2p) t;wthsqshq0ove)

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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 tv0 -+t7liy(4j( o xcd: jfgpbxable. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coibv (i jx g0x4+l:f-7y to(jdcpl, 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 magnz-*j lx jv6a1eetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in th1za je jx6l*v-is 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 fithv 0v) mmnd bugf);2*eld vector points straight up. 0nf2 )u*gmh;d)b t vvmThe magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnex p.u5:z)te yttic 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 tpttzexu5 .) y:he 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 1i ,e))eh7dobetg8wv a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the ind78)beehowv,1e ig) tduced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. iqi ;8nr,x i2gufb-anl8+ lj7 As the north pole entexbr,l;l 88f a7jngii n2iq -u+rs the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constah+bx .u6hme1zg+(ry. o6p iu6*w jki ent 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+(p1 hiuy *x 6r.6emuwkzh+6.oje b gi 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 rotatezp:g 9zgokrw/nw p/4)d 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 rotation if thz 49 n/gw/pgpow)k:r ze 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. mauq.+5ouop)ub /:nf
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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 th )njg- w)k9aei0d 5kjyat 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 fwc )g54zc j(fjield. 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 (orieny +b)uaf7i;54 bvjb vs(no(dqrd2:hs ted in the east-west direction) is moved northward at constant velocity through a magneh()iv obj5bdrby7 s;sdavnf:4 uq(2+tic 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 at a c7 18f z c jvt/qg wtrv3mg(c8hsl+-l:cdx:j;lonstant 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*61 bfxv5a obncs h.4kforms

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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 freqbdcv-38fu.y or4 f.p jt (-ubvuency of thuf pt fudb4o 83vrc-jy(b ..v-e $emf$ 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 devi3j9 yig cu;ee/ce 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 devicecj2-mij188fm awyqw ) cpo 05d 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 coizrk6hi.h. ;( a7suy fhl contains more loops than the primary coil then iz. sih6;(7 kfyra. huht 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 conta tt4z* cnh7x1cins more loops than the secondary coil7*t cnzc 1x4ht then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power input5a::fjb u xv0 kj)p9hr0r-1cin m9bgf

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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 c(l zz ma1b(q,w2e,h tsmth9)wircuit,

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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 indp lzqc8 5w t)y*bac7:dr;/hntuctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the r* ap78:lt5tncy/qbchwd ;)zbattery, 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 batter;v5)pd2e 8uc ;u .dttjr5bsljy of constant terminal voltage. At the moment co;cu;t2l.d 8j trp55j s)vuedbntact 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 inducemuh7/(8j oc ntance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectwi0cl 84 yeum:ed 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 (ow-k2x- u)w o0ezv5y tjht i8u ayuxw132 s3fto a battery. The time constant for the circuit represents yv3 xh1ou zxfsi2a jw(2 -0e8u3 tt5o)u-ykww the time required 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 in serie go ,*o9xmnhilr+:*0za tazl*s to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit rex0oml:znazor a,*l g* th+*i 9presents 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 sax ylr8j9w1wiwyb dg-d+ i;+c*8qcb- dme 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.( ;qk ei*byoj5 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 sup+(fxrjt7 zwnau)3 ucw+dn oqe580 :dh ply. In this circuit, the currentwuq3adf5wo+:jc0h)nnd e t+ u 7rx(z8

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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 the freque 2 bslzj92sl:gncysb z2gsl2j: 9l is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an jpwf( 6d)h7l dinductor is doubled, the inductive reactance of 7 w )d(fjphld6that 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 inducto u8ow-ka uy(9or approaches zero, the inductive ryk-u9(wo8uao eactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC mjbng s.hg4,kxg.z5 *power supply. In this circuit, the currentgn4mjz , .kbsx*hg.g 5

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what facgi i+or+5kmgon:d0 s. tor when the frequency is trio:irgk+i on5g+0 mds .pled?

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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 capacitor apjm iq162l qdr0proaches zero, the capacitive reactlj2 0q 1iqdm6rance 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 k4gpsbxu lq6bu f+. 7,capacitor in a RLC seri6pb 7+bfq, uls4ug k.xes 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 circ9;( r9vds3tx; nk sqgv co*ofo,t2a43hsis (fuit is 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 impe pv,ed/iyrd/p moa/f.gs*g,:5 nfo1 6r w okq;dance of the circuit increases if R increases. When is this statement t5n. *vr/pasf/mf :w d;6qyrkg /gp1, ,iod ooerue?

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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 impedanc:p,9buqh fs: y*dpqn7c ;icq3e of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impe18rz5xxkm ovzq 3 3xxka6:m3edance 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 doubdq ;kt2e *g*/le/wa kiaahp- 1/tz yv,xv17 vcle in an LRC series circuit, the resonant frequency of that circuiylhg1icevd a *2t ka,v//q;a/et *-wpx1z v7kt 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 vz.bo6*;jles5b -ti/ w hvv+ru4m *uokoltage. 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 serieup1 pq nyqmfk;ag1+ 9p-u*bd, s RLC 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 rotating in a jqo */vm9mixq+.+o2 why7c louniform magnetic field of 0.20 T. Find the magnetic flux through the loop when ti+/j y7wh.o +*v clmomqxq29o he 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 uniform magnetic field of 0.200skc 5mgg4 l(l T. Find the magnetic lm0c 4k lg5(gsflux through the loop when the plane of the loop and the 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 magnet(clsuml ,)p/mic field of 0.20 T. Find the magnetic flux t()mlulcpm/ s, hrough 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 sinr iqbq*x676)qmn fi1n) q6syvgle loop 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 changek+ -vcvxv ib)2n,bpqh 4x8p -zs 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 wit v:9t -)g ktyngel.bk1hz l.9ka08 czdh 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendic9 )lh bkga.l ctyd9n-.8v1zk :0k eztgular to the plane of the coil. 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 an + + vmsk: uawwy3jot0png8.-od an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area f8q*8y tddm ;x$0.20 \; m^{2}$ 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 f..c,e ix zg-cn3xo/gllies horizontally at a location where the downward component of the Earth's i c3c l,-xzeog.n/ x.gmagnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rot6 nchlixa )fc7r-4,mdd1s(s r ates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ef7rrcsl)-m cx hs(nd1 d ia46,nds 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 cccl7-,u:zc k8x d v3r3)vqdl has 50 loops and a cross-sectional 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 o( xz2ny9jimb /f 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 r04ajwf 4li4lnyj b07rectangular loops on its armature. Each loop is 12 cm long anrb jl4n0j4l40yi aw7f d 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 output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wirei27(r2t y7yg spkg, ze 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 AC generatrfiki1 p5-g;y22 9mif1sjjcyor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available.9-i2rk jyipf i 52;11fsg jcmy If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxim +c,tc, rdw,gld2 e+4mtnwn*lum $emf$ 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 motor14w 7iml q8ihz ;lbw:sd- 1lml 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.f s,2 n.)cb ok+uqnlphu0 c2i. The motor operates on 12ikfnc) u+0. q ,pso.2lu2nchb0 V AC, and when running at full 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 connected to a 24-V powe ,r 5cnh(3vsugx we/)pr supply. The operating current igxp3 ) /s,vhrwuec5n (s 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 connected to a 24f,c iu3rc9 ;rhfj/d1 w-V power supply. The operating current is 1.0 A at full speed. 1;c rd/c fhju93 fw,ri 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 isiq1cz)4(m 9ln+w+thflg -xkk connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is + lq twkifngz )(-19hk4m+lxcthe back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary vo6e 4/izhd(du1 z5lvyt ltage 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 1je1 c,rzyj9r 74 A to flow in the secondary. How many turns z7rjyj ,e91rcare 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 as9; r8.uzeji2zkif u4:donk ,b hy+d 7re necessary in a 110-V primary if the 24-V secondary han8 4 , ediz;uji 9r2uoh+zbkyskfd:.7s 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-tu- ywa-3pgyf *wrsd)1w rn secondary coil. If the current in the secondary is 3.0 A, what is the curr*dwygsyw )-1p-w 3farent in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transform6xxz4 b0q z4mpgq,ci9 er. Assuming 100% efficiency, how many aqz z6cb9mgx, 4x4qi0p mps 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 transform4ep2c. q 7w;p:2hu movjfee3 rer provides 7500 V at 10.0 mA. The primary coil operates onpuhj. 2;vofwq:32ree 4cpe m7 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 300 turns mt0 z 47u,x 0bcfkbh-gon its secondary coil. If 120 V at 2.0 Axc tkhug7-mfbb4 0 0,z 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 ttz mdmwqoyr-y- r: 9:-urns on its primary coil and 300 turns on its secondary coil. ymdz:9--:m rywtqor- 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 transformer has 100 turns and itdn::z,v3eyoq* wfu*v us *3dq s secondary has 200 turns. If the i*z:yvon:u,u eqdv *d 3*fwq3s nput current 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 its secondaryk*co5x2 h8xe61x,ssjsbsi(m has 200 turns. If the input voltage to the 5s xk(ss*m,xesb1h 2c6ox 8jiprimary 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 transvw7j3jc* 8+ rqm q0xfmformer 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 seco 3qrwf0j8mcqmjv +x* 7ndary 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 currea- yts0ad0n (oofb10b nt 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 number ofn da0a1oy0bf-o(ts b0 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 usualle9;gh x *a3;ym rug-ygy stepped up to 4500 V by a transform myyu 3g ager*;-xgh9;er 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 cs8u z +f/q/gjt8 zka7vo7e2fpurrent 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 transmission line if the voltage is not stepped up./2qv7fz7tp+f8zeukjg aso/8

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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.ab 01*tw y0zto 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 percent10z*w oab yt0tage 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 li) 61d wbe4 gxvkn +r+p5domn.ong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatin di) xb4rv1+. gp5mnow6+ekd ng 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 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 liij.dgmuu4 a,*x * dm6fne at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 10fx,jmi.u* g*ud 6d4ma 00 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 trans* yv:u6x5d0vgvi g6o p*x1yka mitted on a line with resistance of 0.60 W. To what vo6g5 :kgxuv 1d*yoa*xvpy 6iv 0ltage must 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 ofoyea 06zwm69 g 5.0 A. How much energy is stored in the coil's mzg 9wy6a0 moe6agnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. Wha k6ue)d,,v rznk 3p(lrt is thisd, e(3vl u)przknr6k, circuit'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 ul 09 g0bc1ldsin an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V 2kym k6,vtp(s AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of t0ba-v/;cyeta he lamp?cb aat;/0evy-

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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 (rc:q0qctt9 dis the peak current through(dcrt 09q: tcq 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 connecvx62 rl 1x-8p6y(tw/ vttn rbxted to a 120-V ac power supply. What is the power dissipated in6 1y x2vvwtb6 xtlpn8rr(t/x- the resistor?

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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 qxz;t.h ( tf3a50-W 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 5 v8z iuojaa+4)y)rb /3kdino*0-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 a 5; trd,i u,u2sa0-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 inductorlur8(lo ug2 nr p1w(/y 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-mc iqsj- g/w5a,H coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wij(4el(hcxr/ 94n rv7lt. d)gt/r zufjll a 14.0-mH 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 inductive reactan ny-p3dw9wf3 qce 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*g nmlqd8d. ;apzqp /1n92gio when 120 V AC at a frequency of 20 kHz is applp; pqn mq2dzgg1dn.il8*oa /9ied 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, 60.0hd9o4 -sw ,-s *vcbpp(k.i +deaz *bzr 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 cc xnnu+9xp0)k apacitor 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 reactanp54i nqdmvthz954s8s 3v 4ytyce 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 have a reacta kujpus86 d3x(zl l1f* .v*pkince 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 reactance of a 0.010-mF capacitor be 10+ c8l(n) zd1rw)0esu q x3vdcs0 W?s 81)dc3zr) l(w nc0q +xuedvs

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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 and 5.0.w8t6-- dp: u6. zmvvwncq i xa02jues 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 tlw;v20.v jq ch. 1obbe5is*swith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W caslh0c oi.2evb5j. 1*wqs v bt;pacitive 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, 20-mH ci6rbe,h4ev -i0 -h.dzt rahi+ oil, and 1.0-mF ca4hihevd+zir. 6h0e ib, -a-rt pacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 5b3tzwxcq *5v 4jmcc+100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serix543 5mb qt+z*cw ccvjes?

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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-wbo-i4a);n hoo 8u* i4f xnl/)rj bmp:mH inductor, what is the impedan:4u4b)-8 owifix h l oarnnm/b j;po*)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 connected in series with a 20-mHxl5gdb- y ge)o8wtdh;ssy( 007h qv+g inductor, what is the phase g0qd5bs+y8 osvge-d7)0yh( t l xw;gh angle at 1000 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 1.0-mF 08)dorb nf*j hcapacitor for a total fh o80drbjn*) 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 k(bfrp7:d/qe / 0 tvl c;mitxqij8l*4a 100-W resistor and 15-mH coil to get a total impedance of 14 8x ict //j keqfmrl(idv*p7bq;lt0: 10 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 7ld;d k ,-njny c,)cxjh5e7leHz for a total impedance ofc,cdl ehexl 5)-dkj y;nn77,j 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 put in series withn tmozjav;2pme2(,0bw dn.j) a 100-kW resistor at 1.0-MHz for a total impe nvt;2)mz(ajm 0dn2oj b,ew. pdance 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 tulp-- q5t0opohe impedance at 100p5q lo-t0-up o0 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for ahapa8cv 63e)q total im aphv )ec3a86qpedance 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 1p catxf n* l9o9nrs*; 0hlsa,;.0 kHz for a phas;ca*9 trlh,al0sf9*x; n sonp 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 skj2y4 q(*prgz eries with a 30-W resistor at 1.0 kHz for a total iq*r kpy(jg2z 4mpedance 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 apn5 k1qq; 0-nt 6zc)ncaybml+ pd )y6u 100-mF capacitor at 120 Hz. What is the phase u caylcd6)5t;n0pn y+ qk-qm1 nzbp 6)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 resistor, 20-mH coil, qq pdk 28ayr7k k:kq3)and 1.0-mF capacitor are connected in s ka qk:kk78py r2)d3qqeries?

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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 consisnfj;ca.vkg0+kgi5m 8d,, hhgk0:mf g ts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor g8.aff500c gvgm;:h,h jkgk nm+i kd,. 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 reaunw2ri/ovi+a19xg u5 ctance 30 W, and an inductor of inductive react/wr ix1+ u un5vag2i9oance 30 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 angle for a series RLC circuit containing a 50zxu .:n3-s wiklxc 0v4i-.smj-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when c4i -.c3v x0s l i-zsk:u.mnwxjonnected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phasuwryeqoofy :9m+k59b2p7tq c3vn4r2 10v kvfe angle of n29q 70 q:f4vy1e9yuw2v coop + 3 fbmkt5vrrk$40^{\circ}$ 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. xmq/qzlu/onsc 6 +/+fAt what frequency should the circuit be driven in order to have maximum power transferred om+ nqu6f/ z+sc//qxl 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/5 k rrapjvs-xww )8l77 xep+g ac series circuit with 12.0 W resistance, 15.0 W inductive reactavw /w lxxregsj5-p ra+k7p )87nce, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC c tb,ey p7rfb9,)rci +xircuit 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 hg cobt6h8u))p71zbuy 6i sic,as an impedance of 60 W and a resistance of 30 W. What is the power t6,)6cci8huo y 1b 7z)sui pbgfactor?

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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 R+p-yl2u mgqv-5 m/ whbLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pow-ugb5pw / v-q2myhml +er 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 1.0-mF capacitor and a 15-mH coil in ser juaux /+sea7+mkvlphb , 5o5*ies?pe+b5/m+j axsuu*o5,valkh 7

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needeh:mzb1 8zl toc*p kf/2ro.m- fd in series with a 4.7-mF capacitor for a resonant frequency of 10 kHz?. :ckml ztobz*/o -fh8 fmr1p2

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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 serpws :2am*j7d e+4 pulnies with a 3.7-mH inductor for a resonant frequency of 1000 Hz?pw2+ne: 7am4ujs* dl p

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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 30-5hy gt3 .e2ly* ,xy4toaz3 :-klqhck jW resistor and a 40-mH coil if the resonant freqcy-5:ya3,hl ke y*olx j thz2k34gqt.uency of the circuit is to be 1000 Hz?

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