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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 iy,(ar te4lppb0+ g s2tv)bsk kd:j;+of 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 inductl0a 1ds be)8k8q;gjq (lser 9cion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a cbe0ydd -8ln)8 mx4rnroil produces what kind of change on the inducerr)e dbdm4x8- 8l0ny nd $emf$, 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 magnl2 -srau9r6o x0 8htkfetic field through a loop of wire produces what kind of cha6l st 8hur-oa902kxrfnge 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 loop of wire produces what kind of change on thexrdq rf. 2-a4a inducrqd42- xar af.ed $emf$, 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 magnetiq 3/uq w1p x:,r 1 i18vgmmgiyfk:hmm2c 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, the direction of an /t;tf hm0hp ,dinduced current in a conductor will be that which tends to produce wh/f p0; ,thdmthich 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 qf :3 ypx:ozxoipy6d 36nfq9,magnet is held above its q:x,9zff6 yp3 nxo:3pod6 qyicenter with its north pole pointing down. The stationary magnet induces (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 horizontal table. A bar mahd (g; .qm7m,te5)sd c+uhzcp gnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet inducs+;thg)m pc7d.qdhmu (5, e zces (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 regio63eoaq ;bt*tkn where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the q;o63kbea tt*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 whereov 0rcj ngi )kkol;p+v)-e0 5l the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction o lv)0i0; k e lvpjro-gc5+)nokf 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 rey;pz;e ga ) g1hmiwub3m4;k0egion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currmpg;;g3; i) a ywk4e0zmb 1hueent 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 horiz ,b 3-yv9xfklrontal table and carries an ever-increasing current northward. Two coils of wire lie f9l3vy rb-kf ,xlat 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 entexvy gs64;ik9eqn/k wj.i-uo : ring first. As the north pole enters the wire, the induced current will be (as v 9/sen.wk g4;u jqi:-i6xyvk oiewed 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 abouea) a cp-02k erur6nhe;1l2*p .pnqpot an axis whose direction can be varied. In a region where n1prc2);l*rq -0p.eo2ne6k heupaapa uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whop(.nspr10( q*pakd8pxpua: tr,te- rse 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 rot *pkau dp-x tr1(ast 0rp,:8enp(p.qr ation 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.jxh rx7x;sq 3p6t:bj,4ezd )rk5t 5ak
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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 that 2t9.q f1 0yykcaoobzr0dwy ..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 field. Thx.fk dzwji*xi+lm2 vc1uerr*5 c0(.v e $emf$ 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 rez p5qx+r2b flf9zt6 ;x-yf 2direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement conc fr fq;+te r5-y6zpbl9x2fz 2xerning 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 rotgdpyl/,- o+udates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trans3z.s ulj; 9fhrforms

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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 freq5kxfftq 6pf(9uency of the5pkffqt 9 6fx( $emf$ 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 usvi 7)c3pm:s oqed 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 crgk-q5kt(jt,p09t e 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 seconkfd0 k+zy4ar5ho q n6(dary coil contains more loops than the primary coil then it ia4zk5 fkyq+d0o rn (h6s 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 pripy7 etfk5e5 h8mary coil contains more loops than the secondary coil then it i55kph7yf8e et s 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 inputuummny+h,/1s5j;s vt

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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 cdph(n0c(fvxj:vwuc t(37v t;pamh5o*r +f l5ircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cons n1kjz/lcjy: 3tant terminal voltag:c3/j1 zy jnkle. 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 a q sg+uk(accu-cq 3uhrq* 1(d;re connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltag* cs-u;hr d(gq3uk+qc1cq a(ue 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 o c5wk, *2mphhqpo4194z f zu gcnv,u7is 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 resisum;.)bm ,pkwkrg 8 ;jktance 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 inhjy lt(.ne ;a92n9al8bp/ bkfductor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reac9n/ ybknab8fpt. ej 2a l9l(h;h

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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 connec;ncj 2d4inbgu ;y1je*ted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the te;;b2u1j cngny*4 idjime 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 s;(gyo,* g b(xgrk.t+h blxv15b;.larwnwb; xame 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 Ac8 +nvp x/stdn1;9k veC power 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 aik eg/l r1wmb*w-sd;1n AC power supply. In this circuit, the curren swr;1weid/lbk1 - m*gt

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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 chwwvg,l4(7 o kdanges by what factor when the frequency is gdvk(,o ww7 4ltripled?

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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 inductsa02e rr7nxh 7 (jj0vior is doubled, the inductive reactaxe7n2hjrr s( 0i07vja nce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the indun(i eds(-9jrp5b /t;xfl u*pdcti(* xppse;f t r9l/jd5(b-d unive reactance 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 cog),o ts 6m4ik/ cyx+ty0wii/iu/ttg/ nnected to an AC power supply. In this circuit, the currek tig4t6/+0 igiswuiyy, ot/mcx/)/tnt

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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 ak /wn*e; q3jxdn ac circuit changes by what factor when the frequency is /qkd n3jewx; *tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a (i;-d r*dbcybcapacitor approaches zero, the capacitive reactance of* ;(yr-cddi bb 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 ana6 isz db.ta5- k:amcza,(3tsgle between the voltages of the inductor and capacitor in a RLC serieta,dt ( sacaz5 ismk-z.3ab6:s 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 a ed,x0e 3(wwils $\cos M = R/Z$, 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 ofas16w53*xxx ej q1td y/q xe:n the circuit increases if R increases. When e*x :3wjaqq1xy x 1st6nxd/5 eis this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The i9cpwxda m(6 s-rd q97d58via bmpedance 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 th)djap 3gycx+)e 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 se ..zau vd b r35jxfqzeus0s:-+ries circuit, the resonant frequency of d :0szf.q.svz-bx+ ua35eurj 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 AC applied voltage. ec/p,)e sksab;5. huz At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circufb;n2 sndl6-/ljhbm 83 ro ;pwfnuy36 3tx5k bit 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 magnetic field ot c73mx6ildjo s:p1*gf 0.20 T. Find the magnetic flux through the loop when thjg36:m7 ot silc1 dxp*e 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 nj9vy6qdn.n0 a uniform magnetic field of 0.20 T. Find thed 9n nqyn.60jv magnetic 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 roe 9du+naoaml0: --uuu n3x j0utating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane0uxmnuu :l3 j0 dnoua9eua+-- 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 redd ,f/4udyq/. iulqc +hm js(. 0dq8mxluced 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 frjnb;(l1spj 9tk ;2napom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides sq1ww u2 ) e 3vfuj, +kaucj5 ;csyws7*uuw71t18 cm. A uniform magnetic field is appliedwujwqucjy1u23ss)sc;, k7wv +1 *a5ew7u tuf 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 witjyecs4uw 33 7ih 15 turns 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 / z 9m,8lxv/a7r7cscjf*mfa dand 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 e smz ,009wxvbu)v mo8horizontally at a location where the downward component of the Earth's x0w0mb)9 zvv8emu,o 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 )ospxvzdgn y.ouq01;oo0jvs4 n+v t*p:o9 ;a a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fi;pvvo*gs :)z9o4 0;qnxu .ty vo1dn+oposj0a eld 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 anhwae az(lqb93y2w *( zd 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 of 100 turns of 79tnpywl lq/-ws, fh: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 armature. Each loop is 12tzeetd o. o-.; cm long and 8 cm wide. The armature rotates at 1200 rpm about ozt d.te-o;. ean 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 wirez84cp3x)t m+s mk6) /;(ovwot7ehpqs2nc jnp 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 a*c 8k hlppilb(una ;11 ddh4+xn output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area ofhu+ia1xlh kd(pd pb*1;4lnc8 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 withxwfwc7-r.fztn) q a+ / a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of2-fk7cxn: f+l/ -n sfjuwz-hm 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 DClmft;bvnde5 nniv 7:*qio4bb5 t-)3wv q(j0j motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when runnin:n)vjdmf in-b0(ev* 7jtiq5 b 3qw v5tnl ;bo4g 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 6x-r+o p bdkn; )ct7hy 4o.oi2h.0 W is connected to a 24-V power supply. The operating +oo2n) r ty khodi;-7hbp4.cx current is 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 czk,lsjo7/lur ; q :d*a,th )xmonnected to a 24-V power supply. The operating current is 1 r/o 7s)hkqjazt,dx;l,* :ulm.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. qoop, z l2e:p6 The operating current is 1.0 A at full speed. What is the b2q ol,: ze6ppoack $emf$ 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 transformid,1mcd dn:7 dom1gn 8er is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 3-+nnnqbj3z .wq1y jxA to flow in the secondary. How many turns arexb1jw3zqqnn -+n .3yj 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 irgx74bn x1ez 6obq (+rn a 110-V primary if the 24-V secondary has 100 turngxznb +b4 (oe71 q6xrrs?

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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-turn secondary j*;p erwcv;y; coil. If the current in the secojp vwe;*;cy r;ndary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effici hne+38s6zzknrpd6of 34e3 j dency, how many amps at 24 V can flow in the seco+33nd h6d z 8z4sojner3fepk 6ndary?

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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 1m4m,sm tr7 6ekc;x8- pxfn* q lvyxz:eeh10*g0.0 mA. The primtpe *;x4m 8qgy6ex msc7-khv f 0xnm1l:*,rzeary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turn8 sctpf;q9z7 ns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in th n;qtfzs8 9c7pe secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 no +8y munn5rpvbz11-turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curreny n- vo+rb1n npzu158mt 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 /iru5 l .-tput zeg.b6and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the-ez..5t rgp6i/t uubl 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 *ssrg9e6t pc-has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sesspr6e c*g t9-condary 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 its secondary dn/7heg:ad4yjxy x;1g8b.h t has 200 turns. If the power input to the primary is 100 W, we can expect the power output gg8j1n e: ;4hdy.xahd t/yx7b of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stew.: r26earzlm9 mv4iw3u)l iwpped up to 4500 V by a transformer and transmitted mu 6lrr4w: .ewl 9mia)vz 32iwthrough 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 at 10 ,8sf5 )r l;ppbeteqs20 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 i5lfsre )te8;pp,sbq0 n 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 voltagu 7/ :rkjmtx+ e8m1ftte is usually stepped up to 4500 V by a transformer and transmitted throug tt j/f7mxetk+mu1r: 8h a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W) ) jgy ;;ou 3yp7tp0sgi)vdhw. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission linet)0ig h)u gs;o ;w7v ypdj3y)p, 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 resistance of 0.60 W.bul4,w rre-, yftth :y.09i sy A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage i srheryi f:-u4 9.w,b ytlty0,s 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 line at 1000 V. How much lesztf3q sql041i s power would be lost if the power were transmitted at 3000 V inste 4tzl1q0 isq3fad 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. c0dcc( 7-akev It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a e0cav-ccd7k( 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 curreyd /i *da9txc gr/ixoy0+w .t;nt of 5.0 A. How much energy is stored in the coil's0w ti /./;x ogd*ta +cy9dyrxi magnetic 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 id n0ttb;a)i ; tiv**ayb*a0xx nductor. What is this circu;b*txbxn tdta;v)*i *iy0 a a0it's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms volt3z1bu-h9uscw * wm3pcage 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 wv6yd82-mg y ro)rs.t a 120-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 resistan75rblgr(m)lu f cu7c+ce of the lamlc)r+rl u bmc7 (7ug5fp?

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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./0*:k 59ustelp lp43qzoe ixc What is the peak curren i*o e5kzlet:/4xpq9c lpsu30t 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 balgdaw*1/ *s a 120-V ac power supply. What is the power dissipated in the a *gb1/ dslw*aresistor?

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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- v stiuq.e.w39W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistrwl5uo* */p;ue6w dx sor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W*f3 artvxw* eg(w9r tgy0p1z/ 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 x3 o7 twjk//yrof a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coilh5e c2e gh/:as 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 W of inductive reacta1po8pp;h6igr 7myx ; ; jc3ugrnce?

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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 o s: m),q-cjchpznf3(qf inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mHuo-;-f:fb ig s inductor when 120 V AC at a frequency of 20 kHz is applied to :ffi-osubg-; 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 ubgx g*1 4emkpwzij.lx5 9 3-lmt:tj )through a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at keyc6gx+ ): 1zcz7b q7iky0a ;cuec 4c10 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 havy)lp5 iajb+ uk*p-9xre 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 c;vq qrrde7-+ xhgq:1 have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitkqty8bixjn q*.s f6xnd0ts7 a07 k 7g*or be 100 W? t biyqgk0n 7xn8qajkt.xs* 7s0d*f67

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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 1000s0dv 2gt acg5( 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 aru/ wp9 d+ 4kp3zfzc1cc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W czc9wp3kzr4+p u/1fd 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-mH coil, and 1.0-:. 9fc3 r-rc5r. blhdnuivp5hxla9i 7e 9tq )umF capacitor are connected in rqt:uha-ru9).hicfrd.nc55iv9 pb9x37e llseries?

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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 10lgkww i u; t34dn;760pi/bvbt 0-W resistor, 20-mH coil, and 1.0-mF capacitor are connected0 bu4; i/lgtwbvk wnpdi37t6; 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 rm cl (ocb;81zthe impedance at cl z(b1mco8 ;r1000 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+6p2sf0h(rik4 ku5ytqs:ond with a 20-mH inductor, what is the phasd65+y: p( suf2hor0skt iq4kne 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 impqar1)v-z84fa fubunn9i sd4 j)p .1n a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of ab.vjn)u8amfrq p -z4p4 )91 1snfuid 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 i24enc6)vj /jramhm( tn series with a 100-W resistor and 15-mH coil to get a total impedance of 1vj/ehnr4jc2t (a) m6m 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 50ap, j9(1l v(bdi6 tjv7qqy x9u00 Hz for a totaldx 9a6vl( 9 t7iqjqbu1y jp(v, impedance 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 seriesi 8ncuv1/w -p,lv l1a k67ftdw with a 100-kW resistor at 1.0-MHz for a total impedance il7ua /tl 8, w1fwcp1n-vvd6k 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 connectedun v6 d8pl(ra lwwzt1)wix2e,pk2v1 8 in series with a 20-mF capacitor. What is the impedance at 1000 up wvnt pk8(8e ) 6,llz1irw1 x2dwva2Hz?

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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 capaxl,r .sg5de4 sf w )h3mbsqt(7citor at 1.0 kHz for a total impedansq,74met )l (hs3.sbgx 5dfrwce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a php1 a9v/qa8mun q7inahq b 73a+asenq1 /3apa+mb9 n 8qvuaiha77q angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHzc3 ot4qt8r tl8 for a total imptt4qrc o38lt 8edance 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. Wjy qj-6xi l34what is the phase angl- y 6j3jw4qlxie?

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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, and pw1f7vjl dxce8/ .1w+9zhqtwtki3 m x9 bh3.k1.0-mF capacitor are connected in s xxqkib 31m9k7 we/lwpf9. 1.3cthh+jv ztd w8eries?

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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 10i1dhcy3vo6+u-yvxf g- rz : (x.0-mF capacitor, and a 0.350 xy-3iycv+gho uxd :- vf1r6(z-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an6 p;qw7 sq htss.ly)7q inductor of sq7)s 7 w6ql. h;sytpqinductive reactance 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 containizc :w1 sapp43kng a 50-W resistor, a 10-mF capaci1ckwz s: ap34ptor, 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 necesw96yj sy(,*stl,b tnm b*/ u:oio7 khusary in series with a 500-W resistor for a phase angle ofhuylboontk(jib /:* t sy, 9um6s,*7w $40^{\circ}$ 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.p2oqd4wg q0pnvb,7f vc1 76un At what frequency should the circuit be driven in order to have maximum power transferreddv7cpng, q2wqbv7opf 4 n610u 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 resista );(w.x i4i5l yxsww,awsvf4 s y8kn f6a,3lotnce, 15.0 W ixs 8ow3,4 sivwl6fn,wk.fs(;at lywi)a54yx nductive reactance, 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 ciri ;bpv3c+cfbl) i4n8l kz eebbw)h (75cuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance oft6e7gs)z,(q+g pewp j)x ; kja 60 W and a resistance of 30 W. What is the+j,67)( k )pjwaz peggqx;e ts 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 coqe6*jbk+//jc +gj v dhntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductj//j+kh g +ecv6*dbj qor, 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-ecya )-/yv v+mmH coil in series?yc+ev/a-y )vm

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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 inr4l/b) diemj gcap.w -3n, vh, series with a 4.7-mF capacitor for a resonant frequency of 10 3. ,nic/j mp4rl,)bwhad -g vekHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonangr: ptq j uj773ye w8pat8m5+x+u;oxxt frequenm5:r3 op +xtgax xu8upj7;w+ej87y qtcy 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 muy1f2t)fulzzw6xpccd0 jq4qh go xa /: *2s+i.st be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to bjxyod1 a f +wzsf:0 g2*zc). q pxl/2hcqu46tie 1000 Hz?

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