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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 o gdsk 48dpe ;,xpaz)n2f 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(cat6mbowcd ,(1 kqm 1 $emf$ 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 yyqwcrbh4a (-.5j-9ub pltg6 eo(vb6kind of change on the induc4yocuea(5 wy-qgj6-( hlv6rtbb p 9.bed $emf$, 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 mr/axp 3h. e49uzrl:xsagnetic field through a loop of wire produces what kind orr 3pe.x:h9/alzus x4f change on 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 loopx1sxeev)( 2av/ ra ahql/73cp of wire produces what kind of change on the indur12l3aqexa v/ea sc/(7vphx )ced $emf$, 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 mj du+ .lmk0xtvi. +ng8agnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, tj vj rf9l tz6v3-pf76fhe direction of an induced current in a conductor will be tv- f9rz3 6pj 6jvffl7that which tends 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 table. A bar mazen-9 tp.wfdr l/y0+i8,er re gnet is held above its center with its north pole pointing down. The stationary magnet induces (wh,yptz li0rd.9er/ 8w-+rf eneen viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is 77jg1 raduvi;1f+ep kheld above its e7j+ard ;kvpg17 f iu1center with its north pole pointing 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 71c9qwy ye6ewyd (y 0/9pgvyotable top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sensyyyc/ 9v7w1 gew 9y6oyd(e0pqe 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 t0r u1z hk;v0ltnu97k oop in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coi uun0ovr tk9hlzk0 1;7l 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 ma0*ur p7 wwpsn5gnetic field points straighu*5pwws 0p7n rt down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an e7(jpfof5 g 7wm2vz)crver-increasing current northward. Two coils of wire zwj7fr(v5fo p )gmc72lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole en t44aeuu 3q,k,a2fxrnj*i* em tering first. As the north pole enters tqrai 4n*xm,e3ekf 4t*a 2u,uj he 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 constant angular speed u-(e nu7rww8fabout an axis whose direction can be varied. In a region wheruw7nue(-wf 8re 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 rotat* jy34 s7tux+0 yhii3e zqx0f kb*c*ufed 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 the induced ix*q bs exfc yih+k3ft473y *z *uj00u$emf$ 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.3 hjg6 lwsn; l6/9yomh
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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 ), vdfi;zlo6l that 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 magnet1s cqunlf. (pjhu9-( behs1s;ic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west directionle(l8 i ex /e,m/qri2.sfqeq+) is moved northward at constant velocity through a magnetic field that poin /e exqfle mqi8,i+re.q/(2s lts 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 +c2t7 7n4mog 1yvbc iq126s iy2nvkrrat 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 omz9 v /pd4*o y.6f9rb emf*cdo3xw8mtransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rota::0 z k ;7 a.mjxiamxl0z cnmcqwp+.;ltes through 60 revolutions each second. The frequency of the a7cxkcz.+ ::w ;;i00 xlaq.lmnjmpzm $emf$ 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 usedqlepz(k p,y h 56qlf43 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 device tcpjo0p q6+ fhx/p79-j-6 np0byjiaez hat

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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 c 5 taqwuqmz:u*c1kcop2/*l0 afi,c9 eoil contains more loops than the primary coil then iuw9zu,c/:e1 2fqa*am pt5*qiokccl0 t is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than 7 2vq aroj*.yedmsk1 v6a6n8t the secondary coil then iy rea8nkjm q1 2.7asdvv66*ott 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 inrkvo16 ty7zf4 put

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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 xe79azi 1;3,u vg 2 4qxhhvnsbcircuit,

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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 inducta h4hd le95o8eb80 yfxor are connected in series to an ideal battery of constant byafehhl0x8 de89 4o5 terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal bz.1bpq,yw rj/ attery of constant termp,zy1jwbq .r/ inal 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 with inq te4/ )gxuenht bb0dl6m54qw 7)qnu*ductance 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 (2d)tik/l 8ocmsh3g uos);hl /cvb*td 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 connecteiqute.l1 n( c:d in series to a battery. The time constant for the circuit rt(:il.uce1 n qepresents 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 are1ha- ga-h:9nt.;ip hzulfd+ b connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requireah9ab;t-1 uz.h f-i:hdp gnl +d 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 samvb)kt o:; ;f/(q do 21ifjjtuwe 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 powe **o xz3pv-cxrp6j :gar 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 powspnt8+ u6yahm4ys0 z5u/o) hrer supply. In this circuit, the currents0/aos 8+4zt)p6u uryhyhnm5

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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 frequescpvm6fo +0; dncy is os +;m0f dvcp6tripled?

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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 volh1,pacl. 4 -1yw:e olpkwdez1tage across an inductor is doubled, the inductive reactance of that ind:ekle4 zo p1acylw1 -.,1dwphuctor

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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 zero, thekpgy;;amt:b z dv e-;: inductive reactance of;p:mtkz;;:bgav e -yd 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 connectfo *thet3nc8 bf+mwt: i*dxf 1pi5;p ,ed to an AC power supply. In this circuit, the current8 wpi15ntefdi+tmf ,* bfp;3ohx *:ct

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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 brfr3mj7slj+x2 i d0-cjb/d 9an ac circuit changes by what factor when the frequency isddbj+/s- 2i3xf7 rrb 0jmcjl9 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 t.c pw+h76 5zqkqwl 3fxhe AC voltage across a capacitor approaches zero, the capacitive reactance of that capacitorf +lpkq cq zwh7w5.6x3

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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 voltagest/a/ds jd i t/ae* eqojj-a;kv, e9d/- gt)*aj of the inductor and capacitor in a RLC t,ja kj/a v/a)t-e/qi ;-9dogtsaedjjd */e *series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as w-yprhd r 6hkfh;7a;, $\cos M = R/Z$, 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 circwlt phi-gw zh-1c;vtz c8:2b/z- hp.xuit increases if R increases. When is this spzght /p-zc-wh :ltw-z x2b1;ivh 8c.tatement 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. Thg h0:27ewb tehl i,/9itfosh-e 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 thec*8vd)jzt9 iz 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,uf;)u0 gu -0znf j.+qc*cjksa the resonant frequency of +z ;g0ffcu ku jcsau0n) .-j*qthat circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. Atn ke,1iaa53fcf,mi b 1 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 cir1f,oyz1uum) ng 2l yn.4w3shdcuit 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 radkj 45g8 brmx16r e; jvxu813b8mtouw0z n tm4uius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiujnr 4r5j1;zeg 6kbum1083 buv 8mxt mow84txeld 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 +rw/w.kg*s u e)x d;bpm is rotating in a uniform magnetic field of 0.20 T. Find the magp) ; kwge* xsub+rdw/.netic flux 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 magne,mge;dkn/( i,o nc) )gk2xoz 0wlgld 4tic field of 0.20 T. Fin z;w/( cdxn lki02m4g ,ogg)e,kno)dl d the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is .ik9 sdlvt ,3rreduced 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 changes fu0ph n x*;:oywrom $4.0 \times 10^{-5} \; Wb$ 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 ooph(axs r9sn9f560 / spikx7sf wire on a square frame with sides 18 cm. A u sn6k(frs705 9hp9 paxxos /siniform magnetic field is applied perpendicular 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 andpj8l w*yd41w3wa /mfa 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 andxcidmop/j:/ ss s6)8w 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 m flies horizontally at a location wh,tip8 lbhu a. t /3 fmzy.9dtsez7s2h5ere the do 7 yt,z2. 9s/dhlst 8mua5bhi3e tzfp.wnward component 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 bar that is 2.0 m long rotates at a constant angular velcmz97rgrhqr 1.0ea e-2ec3z locity of 2qelr3azcgmh 2rzr7. 10 ec9 e-.0 rad/s about 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-sectiona).3yzjo;(zy-tn nifzkl-* p+nlmu,pl 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 cv :;jw /, qki:ajzs+tturns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armatur6a;5 )zod fxmoe. 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 loo)oo;5dz 6famx p 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 tur 8rtjwbw8j+og 1i,ob*ns 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 AC generator with bh abn( ;q47)cnojn(.av c0ep an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the acbcn)aq ( j( ;nv07oeapb4.n hrea 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 maxik)rg.oqrl ,3 l /anmh/mum $emf$ 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 W1dmwq8 8 pc9uj. 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 optufd+ p; q+h1stva*.qerates on 120 V AC, and when running at full sa;u++.stfp 1thqd*vq peed 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 supply. .vp) z9ojjj 4te1zvjjw8m+ 9 j The operating current is 1w z.m +4v j9)jjzjpoj1tej89v.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 24-V power supply.r)qlj0wb)fg *f9rlq + The operating current i qf0l)qw*jl g)9rfb +rs 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 is connected to a 24-V power supply -p zm)rq hfu;0u8(y p 8mmp(xzywo1x-. The operating current is 1.0 A at full speed. Whu88 q(ro 0;u fp1pzh(-xmz )wmy x-mpyat 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 needed to reduce a prima-crapag w+:d8ry voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow ratc .lus g2.9in the secondary. How many t crs.ual.92gturns 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 pyku;7 pv +1fxyys).k9dn d-ocrimary if the 24-V secondary has 100 tur-k u.d9; 7fycsyok+ pv)y d1nxns?

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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 couywrrq7 3 o;a5ytik 0ckq*l758y1p joil and a 2000-turn secondary coil. If the current in the secondary yyw;lr j *3k78p7 iac5 1y qk0routqo5is 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 primary of a transfoh rgd;i7, ed9lrmer. Assuming 100% efficiency, how many amps at 24 V can flol; ,e9dhgi7rdw in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Th2sz8ri fv6 t)ue primary coil operates oui8f6 st)2zv rn 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 turnsz 0 egie:m*r3n,3e)n ja9ezjd on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primarynzm9g0n:r3eje,je ez a3 i d)*, 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 ts;gzetuq /fjoj *gfyypp xow( 86j)+*r1r x.0 urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pr8 +r6*;f/ppzj wq*rs)1xey jfo xjtgo( g.u0 yimary, 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 transforfd3g.jwc d 49dz pw-n5mer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, wec4 35 fzdwwgdd9j -pn. 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 se 1g.8sir3ghffcondary has 200 turns. If the input voltage to the primary is 100 V, we can exp18f3 hi.fgsrg ect 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 transfor pgw6hzd)pg1 6mer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the pd16g pzpw6g h)ower 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 1a *yne6,2jxy;oc an5f20 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 n5ay *nao2y; xje6c,f of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120x0umq: 9 aa(lrb)kd oq+ n/nb4 V. The voltage is usually stepped up to 4500 V by a tran)4lb/ mx(a: arqq9d0o +bnnkusformer 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 cn0tvs3z0*,eka cy0k / e;cekfurrent 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.een0ct,cezs3 0 vy kk/0f*;a k 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. yooknsr7.4 h3 b le9+x A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, s.439+oelh rybox7nk the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total d0cf2vi ,v e14kh,dip7q oqn /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. What percentage q1v kdvefcq,od/ h2i4 ipn0,7of 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. How much less power woul0, uj4zhvakr.d be lost if the power were transmitted at 300k,rz0h4.vu ja 0 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is tohan)l8mbn 7p m( q9fo7e-tb4o be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if optqfbe h8 4)9am nbo7l7-n(mthe 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. Howo9*mi/o,gv j6r +fixi much energy is stored in the coil's ma9jiov,o*6 rmifix g +/gnetic 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. What is;cpz 28a8x nz gb-- qyq-jw,yp this ciw 2yznzq jgyp,;qca8-pb8x --rcuit'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 ifb7vmnrnz /aco( 2 j3tno.h 99n 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 128w vwgok9;xlza6bt;6 0-V 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 tw ;v w48yrun9che lampvcnw9 r 84uwy;?

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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 4ww7ri9 v5*r6mzo fz z)yye(kac power supply. What is the peak current throughy z o4z7k*yz()fr wr6w9ei5v m 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 connectejo6mzl:fj4h-pw5)xe- yl m 3ed to a 120-V ac power supply. What is the power dissipated in the resistomele5)zj3-yof-wmx4: hjlp 6 r?

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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 resistor2v-cve4 o l8/jd * ex(brp.eil is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor isw5c4l4ey)5 ph dzj7 ya $I = 0.80 \sin (240 t)$. 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)3al;cljt pun0r*fo s0 2wi1o 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH 0x1/6pga6 k2grgary j9: dgfm t 4v.hminductor 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-mHi7 a* ir/mdc6.x 2kpk:aheke- 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 will a 14.0-mH coil have 14.0 Wvon04d t8brz3j+lg w 2 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 reactanc(63iv cm z;v jboe.;pne at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC)ce2z*zh gc n4s 3pfy; at a frequency of 20 kHz is app y2 czn;p*) f3he4czsglied 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 sourceb t kqkw,.)rl;?

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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 ccz g9ze21dn s:v; k7xnapacitor 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 ,s g)x29rho5dh+q q bkis 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 capacitor have a reactance 4ni ij t:6u2rudh0x/z2c;slxgb0 qv7of 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 reactwvk0p 5ja x0 ajkl6*6x u(i/izance of a 0.010-mF capacitor be 100 W( p6 xwxu0izav6ik50lk*/ a jj?

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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 capaki 5*mwcg*m m5citor 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 tw1eu3j*p ya;e s2) ;y6v7,vhfgg kxjwith 12.0 W resistance, 15.0 W inductive reactance, and 1v1jsp26kgew 3gj;t7va) f, uhy* x;ye0.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-eq6m- vn*8f uqmH coil, and 1.0-mF capacitou8f-n*6m qq ver 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 100ab7xj u 8ek99r-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s7r9 kab j89exueries?

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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, whxlmy a :-6w-qa5aoi0miu;sseb*5rp+tm x z+*at is the impedan xa s+u+ame sy--ot bi56xi0*m5;al*qw:mz rpce 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 connecvj5ln* h 4cf v86r-ilnted in series with a 20-mH inductor, what is the phase angle at 1000 Hz4 n* v8l5fvcr 6ilhj-n?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed0vwc fq3gcb 28 in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total imped 0v8f2qw cgb3cance 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 nq vsxenj3xa d z37lc:yy,+.r 4eeded in series with a 100-W resistor and 15-mH coil to get a total impcrvxsq4a3d 7.:j3 +y z eyln,xedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for hvn7x(0/irx jx 7mb o8a total impedan/ij7xv o7 hnm(xbx r80ce of 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 with a 1 b z(; 4ofm,oog1+vtxa/r q2gj00-kW resistor at 1.0-MHz for a total impedance of 150 kW?1qg+z(4vg;aoxro jt ,2mb/fo

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the *kni:m0 t,z ayimpedance at 1000 anzt,*m: k y0iHz?

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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 a9 ;.f4hwcl kxm)a17q bbgad)p od6d)z total im7 ;dqgaa hwlb) dk6pfodb49cx )1z) .mpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 rc,mvl;o0/bh31dp7hj eh 8rs kHz for a phase a1 o/h7v;c dp ebj0ls r3mh8rh,ngle 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-p-e j (f/gp;l0jy /q1se dlnb2W resistor at 1.0 kHz for a total imply f j/(dg/qne-js1pl ;b 2e0pedance 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 capacit wzb;0bcujwu9j.f/-9r,xp a gx1anu 9or at 120 Hz. What is the phase anglex a9f1 .un,wua;rc0 /b9uj9j gpbx- wz?

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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 3/3gpyfs3, 2tgz gdks.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacit,sfy33/ds3 pkg 2zggtor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capg r,hbmgy)i h5h2q0t9acitor, and a 0.350-H inductor. The circuit is connected to hhb95q gg)h0iy, rtm2 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 capacitihtl63,8*hdj gv suac ;ueg15bve reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz powe5 ;d hv6g8ju,3gb1 *lhustcaer 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 cirs; mvu :boer1*cuit containing a 50-W resistor, a 1o*1b e:sv r;mu0-mF capacitor, and a 0.45-H inductor, when connected 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 phase ang,-9njvv8 i uzj,msp(lle of, ipsvl8v,mn jz-j(9u $40^{\circ}$ 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 bq2n5, .)wx*o e401t5qk cuwrpvf px hfrequency should the ciwc)qp1b. ,v 052rkt 5o*px4wxufnqhercuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resist05x9 m. fgsoacance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supplyfgmaso5x. 9 c0?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is nmixj 2m25-yeth eg44 $63^{\circ}$. 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 res avr/x* j,93lu(8brdytry .zjistance of 30 W. What is txb(ru9zl*3 j/y.r,dtjyar v8 he 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 circu2hspms o8cg6kf c05+d it containing a 50-W resistor, a 2pdsh+ 56cfomskg08c10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant:+zey ykcdy5q82 t 9inde : p-,cvf(ol frequency of a 1.0-mF capacitor and a 15-mH coil in series?,+ 8 -:y cq(epf9yi ocyldndv:ze 25tk

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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 seriesz o 41ina*di5 09xjo iyyy5nv- with a 4.7-mF capacitor for a resonant frequency o i4dx5vn5n oj a* iz9o01yiyy-f 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 v tg3vrw9/ eoi37gcr-in series with a 3.7-mH inductor for a resonant frequency i/vorw c9gg-tve 7r33 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 muszq*4neenm1rj mg/g7mijw *)b)ws )- lt be placed in series with a 30-W resistor and a 40-mH coilmmnqg- zn)j*/rj 4bwwegm* 7eil )s1 ) if the resonant frequency of the circuit is to be 1000 Hz?

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