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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.z vb jrs 5:z1e-lgz)e5rpke bw4.f3 q 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 stnrrzk38r(f :lg 0+)wc o7mknnates 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 onum+e8g a8) ojn*xg*f*/rgju k the uo*mke/a)xgf * 8un+r8g*gj j 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 a loop of wire produces whaj/tc u .es,/m ds*ke8jt kind of change on tsme cdu,s/.kj8t* /ejhe 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 tszp gf2 z2s,/lo0x. *qz gw7cloop of wire produces what kind of change on the indu 20,oz2 s fsq/x.zglt7 wcz*pgced $emf$, 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 fiel/de9,ww dko *xd 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(bl-q9ya *dm vhe direction of an induced current in a conductor will be that which te -b(dlmyva9q* nds to produce 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 t:pf1y ebwbm(z* s68r sable. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induce be86w:ps sy m(z*1brfs (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizo gte- wnoox- ;m6b/8edntal table. A bar magnet is held above its center with its north pole pointing down, ann xt; o/be8--egwmod6d 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 ref1 rw)kk9uopz9s dd2t/x7,5o2 kyug jgion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is tfto72)2/5k sg d dkpu9uxzjr k1yw,9 ohe 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 field vecto;m)8arz(z9 aawg2bytb2gwl 7 r points straight up. The magnetic field suddenly grows stronger. When viewed from aboveg w28zwz;l27)amra b(ytbag9, 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 magnetic f)q/kv: pf6wb w4pczc.ield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the fz/)6cwpc4wp: k vb.q 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-incgs wl qcu0.f1*reasing current northward. Two coils of wire lie flat on the table, one on eitu *.slq01 wcgfher side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pwz(t ec e53tfm2 39bbiso, +,q tpnmd.ole entering first. As the north pole enters the wire, the induced current will be (as viewed fromt. nsb,mpt2fi + e tz39(mo qdcew35b, above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speva xnu91z5u;58 hvda(nxnk5red about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wn rnxu 1xkauahz (5d9n;5v8v 5hat 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 a x61rmo, 3xpwkngular speed about an axis whose direction can be variekp ,x1o36wrxm d. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.m0ufgz*m2)x.,qihl e
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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 thatpkcm +:py*yj 2v-v,( s eelf2u 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 fj,u .q fim57ppield. 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 (oru*otv a3y/ 0i qy5mx0(2/zx md-s qsfliented in the east-west direction) is moved northward at constant velocity through a magnetic2 0myslz m/uovxx0/-y qa iftdq*( 35s 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 zza44hd* + sokconstant 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 generatosx8xxnxiplh364 0r 6xr transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutio)*f s-imudx z.vtg1 ;yns each second. The frequency of theid1x tzv*u; ).fms-yg $emf$ 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 to h*s0fpena+oavw7j+ ))oxa 4e

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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 tx)ie1/ c 4wtruhat

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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 than dnh8emv6/swu-t1 yyendv-zb 7.d(rm io48h( the primary coil then it isvh(h4 dntrmne7m iu/-(b -d8s8. doe 1y 6zvyw 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 containek-hsx+nbe kx vpcor 1(2 r)e7s73dl 7s more loops than the secondary coil then it ebl 77h)s rs(vkx3edpr-1on7x ec+2 kis 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 pmt xqt/tod4l)tv 1v0jt5 tl 06ower 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 circuieyua0k9 71z+hp5fc v bt,

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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+j7eg)whuei)g 6r3 c we 4lmx- ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrehxw ej67g i+c- me)wu)lrg4 3oss 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 battery of consta dh ,)c9tojp*qnt terminal voltage. At the moment contact is made wih9, op)*qtdjc th 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 inductance L and resistance R is conzuen43 gvh w1m3 ,p6xonected 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 connected to ae *99op4:z*yuu s ugifn $emf$. 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 to a battery. :cvb(ll1ge d+ The time constant for the+1gv(l:b clde circuit represents 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 series to a battery. The batte* 7kxwzc*lz/n bbxt:0ry is suddenly removed from the circuit.t/b* ckl0xb7zx zn:*w The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following h rothe0 ,8uyzjk1., tfave 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 this circuit,ef9tztfn) m 8dx8d8d -z8 m,iq 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 p mrg63il.vsqq,n qu79ower supply. In this circuit, the currentm6q9ivl3ngu q . 7s,qr

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance icr0agv .lf;-xl qdf3( n an ac circuit changes by what factor when the frequency .0v d qxrglflf(-c3a ;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 thl- vcvvm7rr ,1e AC voltage across an inductor is doubled, the inductive reactance of t, l1vvrr-7 mcvhat 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 th3+q/jafq:q mfe AC voltage across an inductor approaches zero, the inductive reactance of +fm 3:qqq/af jthat 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.+l4bby1 l myafm lgft+t 88au51e ,s9f In this circuit, the curren11g8 5elbsautybml ,8t a+y+lf 9ff4mt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reacta gx 1ar6i d)eaw+l20.zrgdy4rnce in an ac circuit changes by what factor when the frequency dw. z+i4axerr0rg) 6ay d g2l1is 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 thehxhc h3ebni 0.)h-9h g AC voltage across a capacitor approaches zero, the capacitive reactance of thahhighxhc b0- eh3n.)9 t 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 capac(u y;np5:tsot itor in a RLC series circui( tp;uo ty5s:nt?

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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 defin.1 v (5wq ul,:wieclpwed 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 increases ifa2ef)ccw1q3amrd:is 2d + v b0 R increases. When is this st 0c3awdr ema2c2)d+ bqf:1ivsatement 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. t4ryld/*r .fbg9h-g d The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit i q7ddn6alz m (8gdwx7 55bhpn/v4sq9 gncreases 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 sers 7bj 3e2ekdb+ies circuit, the resonant frb7 j23+skeb edequency 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 driven by an:om)o +nvn ggsck6w*) 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 ionpl;0fc 1+s1yo/ nn+yuhi5f s8z(n 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 uniform magne-noaat/x+tc- x e stl* :f697 ba0ipwftic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are s iow/-acp+exf f b 9tlx6-tn0*t:7aa 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 cah -dhr*2jqp z-u7n 2in a uniform magnetic field of 0.20 T. Find the magnetic flux throuhc-d-qp*2rhan 2zuj 7 gh 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 mago05tytlir 8 8anetic field of 0.20 T. Find the magnetic flux throughlt 0ryi8toa58 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 singlee l6qgw.ew .d8 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 ccpbtr:llb5wm)1b; *muso.jwic - t 8 .oil changes 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 rr-h87x:3w qpceq4 ipturns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 inq4p x- 7i:er rhw3pqc8 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 tfp,3v64zdz z xd r*:hturns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and kmsum*(/l *zb cxd i)2area $0.20 \; m^{2}$ 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 winghyc 4i:n0/iw 37g+rsf efghp9 span of 60 m flies horizontally at a location where the downward chwg 9f04:c+p i/egh3n7sr iyfomponent of the Earth's 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 bzex81 uy e0 9:kb7qjchar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertickque:cx0 j7yheb 1z 98al 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-sectional of ,9fo8zmmz6area 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 om./iip xsi7r*e jrv:a)g,+ ubw .7rywire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each l*f sk:8r.pwa ;l hih2qoop is 12 cm long and 8 cm wide. Thphk*.:8lqs2wa i fhr;e 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 wire of1.v(ngs nw.ku d4 0pjj 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 generator wtcu(crb: 9 d7aith an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. I (:bct u7cdra9f 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 generasta(/zs9e ia 4u,pja+tor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor havnb. q ( 69avtubpja-s*e a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of .k cop/5k mu60na)q egjn 7fc(6.00 W. The motor operates on 120 V AC, and when runoemcpuf(0kn 756 /. kn)c qagjning 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 power zh.lxd./)d gun e i0,hsupply. The operating current is 1.0 A. What ishidu)l/ dz ,nh0 .x.eg 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 powbl2j q ;9po)uzx fbl49er supply. The operating current is 1.0 A at full9 94 bof j)lzxqubl2p; speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24dcv q we50cv.7-V power supply. The opera0e.cvvwdc57 qting current 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 ned0h*,f bs t(sl 0pyaq-b*;el-mdc 9nkeded 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 causesii ef+deu+ xh-1lr(c1 14 A to flow in the secondary. How many turnl i e1r1+h-+iufc e(dxs 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 24-V setokwji1..k.5 qa0t e6yut.ib condary has 10iw ttuq. t1e 0bojyi.k56ak..0 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 kp.a vzkagarms9yk6v;k8k3cu+ 3 d+2 of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prikk.v8guaaa9 rsky6c+kv p;3z+mdk 3 2mary?

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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 sa v9kw* ggmhh 6w5x ,o :::.jhauuii-transformer. Assuming 100% efficiency, how many a,a6 mv.w ih:o-j hu:ahk9siuxw 5g*:gmps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 750zef3zg)m 7e i;0 V at 10.0 mA. The prf7 g m3i)ze;zeimary 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 h;3r9 dhg7rn emas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondr;ngd7r em3h9 ary?

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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 8( mbcfu: :zdvm9/jz-ea 5jegits primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presen:v z-zb:8 amj5c dm(ueg 9f/ejt 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 fidnylb(dz* f(86. bs has 100 turns and its secondary has 200 turns. If the input current a *yb(6.lfd i8snf zdb(t 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 secondary has 200 turn7lbv .r ; :a-9xqxvgsaqdd;/js. If the input voltagxlq;d7:.v 9/ arqsjxbgd ;va-e 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 transformer has 100 turns and i jki3knjj *qa1oz32 /rts secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of12j a zi3ok/qk*rj n3j 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 u yz xx24j:kep(sually stepped up to 4500 V:eyz(j 2x4p kx by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current a:p32c2 rhc vke crwou)eq(-2j t 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted th 2jpqc3 ew k2heuovcc:(rr2- )rough 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 o3ux ra3*dggs/t,5m pvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 * gs3rt3 g,x/u5m dopaW. 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 h 5vaol7vpl 5t)as 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 with a turns ratio of 100:1.t lop )vavl557 What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanceilq -mr)yjhq3t) :n)glh 82bx 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 eb):i htm3)l rq)2gjlq8xn-hynergy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How mucom5zvqnjpec y 4xn .16;g3wg,h less power would be lost if the power were transmitted at 30001 n.ycxwzveg5,3jpgn6q4m;o 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 genera-,rlp* x.ivegd. *xvotor is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stel*g.v,* oxv-ie r.d xppped 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 5.0 A. How much energy is sto: pkcgoisyl09pf. ,0c red in the coil's magnetic f ,ckypglspf0.i:o0 c9ield?

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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. What 09 /g5floprk00d iagtja-h +;c(mgiyis this circuit's time cca 0 ja pgl09(dy/gih0k;fr og +-ti5monstant?

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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 volta2pr.8wz qzi2 yge 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 currengt ((:y qeyd*rt?

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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 it, t2c qk2ms-AC outlet. What is the resistance of the lampk-2 t,i 2ctqsm?

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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 curmlrtfz8b5+7 ; / qmgolk2cgw1re1ro mzcq;gfk+8 tl bg7lmw52/ nt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply.fqtusu -w(1t0wjp w e)cqs,0- What is the power dissipated isw)wqqj0(tt w 0,us-cfu 1ep-n 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 (crbjax y w4;,*u2xrma 50-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 50-nx55q 6vwncvpw ti .6+(airg4 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 laq w xc0 b.oea.;/dh250-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 v3 fn vrb9pz:,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 rea1dor40 kigj 6i(k -nttqs7 d1bctance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wil0aovu d; jea53j t0vl)l 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 reactance at 1000 Hz?yux( *6 6q, wp5 n0dny(cdbmdl

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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 frequenc2lh;3 l,mce6 d3dmuzjy of 20 kHz is aem3lljmd; c32z , h6udpplied 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 so;yky(7w jpp / jone3n51usx5curce?

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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 re7,0hb.c-ljd e p8 /xy9kpjnqmp/zo* nactance of a 4.7-mF 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 capacicg-e8cwwq6hrp+70w b k 9 t2hotive 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 capacitor havez036bp08r oxf uoeed 2 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 reactance of a 0.010-mFyvlp 2k4 5uat. capacitor be 100 W?vt5pk4 . au2yl

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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 capac8q0l 3xn zyc;hitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12r5kux09 . d 3ji3jvzdd.0 W resistance, 15.0 W inductive reactance, and 10.0 vx33j iddu.zr59kj 0dW 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 c+ kb*ps)h2ifr 40zid100-W resistor, 20-mH coil, and 1.0-mF capacitor f)s4r +02idiczhpk b* are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, andm*z k8o wccj8s gwg9 ybq.4auc3c fjx15)(:tw 1.0-mF capaci qaw8 wkz5ufjgt(x 9c.go c*jc cy:14b 8m3sw)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 with a 20-mH inductor, what is rdkod(f994x j the impedance at 1000 rjkd9 4 o(9xdfHz?

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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 9wb fo5c.ovw*in series with a 20-mH inductor, what is the phase angle at 1000 w boowv9 *f.c5Hz?

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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 cstx 6u9/9-x ex;el+vb6xqa/0 x lmgra 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at xbx-66x9te xg0l/lmxu9/ esr +a;cv q1500 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 gr a.+a k1e zf+jvm23xa 100-W resistor and 15-mH coil to get a total impedancexf2r3 zaevgj.k1+a+m 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 s1lvbuc)a,(p p 6cjsxy5 +nl 3p l4/wrperies with a 450-mH inductor at 5000 Hz for a total impedance of 40000pxbnp ly,4vs/(la6 )3+cwjlc 5ppr1u W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance mustgxv fns64w2;d*z . vki be put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 .dsf2 ;4 v*nxk6g viwzkW?

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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 20azu2f vr8j2nourp49pnx9 -j )sv:k j8-mF capacitor. What is the impedance at 1000p2zvs)jf8jvp2rxku n94u ar9 8-j :on 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 a to3m.4a.p6fqs(ydd uzj tal impedance of 4d. sjz yp64au d(fq3.m5 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 neededr yp;uz4y8m 8d in series with a 10-mF capacitor at 1.0 kHz for a phase azur8yymp 8d; 4ngle 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 aw vky0(uj 4j*0 gtxnf44 zdlc+t 1.0 kHz for a total impew 0g0ln4*yc jk(fjd4vt 4+xzudance 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. ,ri(ttyu*xyl0h, hr9 What is the phase angle0h ,y,yurx ti9r(*t lh?

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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 o zn */4xvq+3re 7f r7nksnt)xcoil, and 1.0-mF capacitor are con3/qrn7x)o7 * kre tfxsvn4 zn+nected 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-W resistor, a 10.0-mF capacitor, a3tlo1ed.n05ub p , smgnd a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current i.d3p sgnob, 01lum5ten 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 reaclq de ,-+s54)kfivp3rqg+pcam1j0 .wi x bzj )tance 30 W, and an inductor of inductive reactance 30 W are connected qed pcamzwvf035 -gjj 4xsi1b,.qi+rp))lk+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 a5zwkn;a4uj 5+ i/kv jv 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power s iw jz4knv a5u/5;+kjvupply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase anglemcxpuel e; ,rwfm-,g,to 4 /f4 ofm4 o,e,4pxe,lw /tm;fuc fg -r $40^{\circ}$ 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 g wjug8ixedl559b5-h2zlu d: frequency should the circuit be driven inbe:gwll8dju5-d2 g zxi5h 9 5u 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 resis2 swqjeeu9+( hcp p;l-tance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is ce-;p+2 qehlsu pj9(w 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 mf5 uvzgx9( ,cis $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a(k 6k nbw kl)m4a+xhu6h3(svdp7j ck7 resistance of 30 W. What is tk6 ) m3hx(p(h+k vdwbc jnaku67kl4s 7he 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 circuit containing a9symiys 7vs: dc o9;h/q34 mvv 50-W resistor, a 10-mF capacitor, and a 0.45-H indu/h9v: 4c;svms y i3vsyd7o9q mctor, 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 frequency of a 1.0-mF capacitor and a 15-mH coiln 9bf2nra)y 2k in series?r yk22ba9fn)n

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonan c g8m4v.trkgy3;gq s (*emkfrwr346g t frequency of 10ry.43tg smgk3c6 rrm 4( kqgfv8*weg ; kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series wk/ eotiv/ 8f 6hsip87lith a 3.7-mH inductor for a resonant frequency ko7/fp vih/ ti8l6se 8of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH6 wq8w,b fxw6q coil if the resonant frequency of the circuit is to beq 6wqf 6wwx,b8 1000 Hz?

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