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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 magnetic fluxcbt9 o: 3-h br+,o l jyts vh68o0wmbm7jk(/xt 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 thyv9i. n *1eyrje $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on z b;70gbohx. krmz1xth/zq() tzzm.k7b)tx0b (g xhzq o r/1h;he 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)zntphkh*5vl qp 9 b)g.jw.,a through a loop of wire produces what kind of chanqpw hg9)nhtlkp,a.j*.z v) b5ge 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 tzr ji5p98 k2k3rw 07mlb,pkd of wire produces what kind of change on the inducm7tk0 ,prbjd 3rk 5i829lkpwzed $emf$, 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 field suyu n+px s:s)u99k-i0wzei; 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 induce8;xmhi ws0c5e d current in a conductor will be that which tends to pex 08ws ih;5mcroduce 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 magnet is held above itx7n n. (zuo7qsolr72 hs center with its north pole pointing down. The stationary 727uz7hq s(ox.rnn lo 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 magnet is 3/b*hz oocc)cmj a fj8tcty-f(z;m11 held above its center with its noz/o yoc1fcct jm8 b m*tchj3za(1;-)f rth 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 uv+r/5tk4yvw e2 kpq8 table top in a region 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 covy pu5v2k4/q+t8 kewril 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 vectof 4*.qbzh)5abkc u -mwr points straight up. The magnetic field sudde-k.bf4b 5haq) *mzuw cnly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic field:lp(y b4atc 7g points straight down. The magnetic field disappears suddenly. When viewed from above, what is the dir glap7(y b4c:tection 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 pe yq02:1mw1g99l uesxpj 3 iband carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on eithm9sylupwx:3 i 1pe0 egb1q9 2jer 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 entering fir ka; cnc r-/mkvhr +c ()e-ecln48d0 *eoucl2wst. As the north pole enters the wire, the iccwr;+dm-c rnueah l0/8 e)vcn*(l2k- ceo4knduced 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 ruzr m50pp-3)plzw) gi:lu z.yotated 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 u:)l0u) 3i 5-pzmwp rgylp zz.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 aw) g6hh *dc vdraxx8:)xis 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*8arx dhvdwh: g6)cx) 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.qjq1hm dl:,2y
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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 an41.zy-3xgsjmorg4g fz, -9 fnlrzo l) $emf$ 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 fieldb1y/sl.x )aj* zripaa g2i *-s. 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 e 3nzxxm8, +zpqn y-.huast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statemenz,3n-mzn x q y+puxh.8t 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 constant angular velocdd4 pt ta (27(thg)brdity $\omega$ 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 tr jpwdu. i,/avw80f/+ ydxgz8 tansforms

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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 se6u:z5z v -dvt2ww vex:uchk8:cond. The frequency of the 8 :5 txe2wd6:v vzuwu-hvz:kc$emf$ 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 tpxjhv - q6o1qse-m; z3 wy5yj2o

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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 deulq4q ski+i7vrm)v97bzb(su5 k .l d0vice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more 7f4adm .0ggp2ul)i.wlqg8r c loops than the primary coil then itl.p)i084w rag 2mld7u.fcq gg 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 the secondary co3+oycf -n. *verckx- uil then it isr-no*fkx.e+c-u c3y v 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 p4nhm-sbme 3j4x)tcz 5ower 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 ciri, vkyt,0bu*z cuit,

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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 serievasc kpuw wor,r7*r.:,;a 3mbs to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltagea;*. wbc,,ur s :rw7amorvpk3 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 batteh /l4h3.z(batab gvakti uu c -cv8(8+ry of constant terminal voltage. At the moment contact is made with the battery, th+tv(ci -. 8ag uz (34 t/lakcbvauhbh8e 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 res.jq;f *g32fwb0 bk.tx fp1 usoistance 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 indbiib3mw wy *g 7cheoud2*u3 7.;odqu fvq1c6) uctance 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 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. The )v(1vb7e bm f7 b*hmyitime constant for the circuit represents the time e7f1bmymb7i*) (vhvbrequired 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 aa;2 (n mzv:dt0 /j 9ilvsou fmd(id.l3re connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required fof l2tdidnm 3a0ul v d(:9.(s/jm;ivz or 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/ q/wrg41w vkyry*4b*a u +gjdfm +hn/ame 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, t 2jf, -b2d24utvqrhj ghe current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cur +be+lt0up;l**w pquh renp0 l;*blpuqh+ +eu *twt

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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 t4mm, i7*vv 0/hfjygy wmq0+h6v4ght changes by what factor when the frequency is tripl7g0jm/ wmft qm*064yhvt,hv igvh y+4ed?

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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 inductor is doubled, wpi pyndo 1;yswld46a84 . +lathe inductive reactance of that inidoa8 4y4d6 1s wp+.w;allynpductor

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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 a*bblwqwqh75p,5dddg qs +ge-h4z1 j0cross an inductor approaches zero, the inductidhwlq d5-7zb05 ewgsq g1+ h,dbqp*4jve 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 connecdw. iq7/m1n y6ag+ kz;ihg0fn ted to an AC power supply. In this circuit, the current1ghz ngf0 +;7imw nq.d/kiy6a

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when xa7*bbey,oi 3the frequency is tri b, io*7byea3xpled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zehn v3x/s (ke(:/7 of7a; zvbps/acpouro, the capacitive xvuba( o fp3h;ca/:k 7spozs(ne/v/ 7reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltagescos-jxa2ax9uh7wwg kpp- f965ln1i + of the inductor and capacitor in a RLC series cir5jawo9-fa 7pk-w2px + slhgn c6u 9i1xcuit?

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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 i.vt70nbyq z upz 5mo,a/05xdys defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of k:v(1a )q3djqd 0 vq tv.kci./ ip7smhthe circuit increases if R increases. When is this statementv7()sdk1. thpa kq3i vm dv q.c:q/ij0 true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases i1itf5ptx b4qp-w+ yc+f $X_L$ 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 c diop49j gl,+bircuit 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 a/rlmg1 jawo 5i(l6nzc /v0g zl- /h,ivi yay89n LRC series circuit, the resonant frequency of(ajwm50/i vy6ya/ig8,-/z9zoll1lc g nrv i h 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 9w )qgbf7 lti,an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circx-j xdih)s7) ah2duls 2vel29uit 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 of 0.6m i 4y p+dy yxck:d+pf9/ael720 T. Find the magnetic flux t/6lic9 me4+p:axpyd f k7yy+dhrough the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a /-qt;p34aa5x1iiaktxn 1uq iuniform magnetic field of 0.20 T. Find the magnetic iiqp q4 1aak -tu1/t35xx na;iflux 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 magnet8hbxw )a(s5p ar6rink.y2 og /a e5wf;ic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the5)nop8. w swh5a(kraexi; / r2bfgya6 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 2qe j+nfs0n dga*2s,nsingle loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chak6 )ra igt8w*atq* oq9nges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of w3.7tmfh u v*9 lo/xsoaire on a square frame with sides 18 cm. A uniformts39*lxva/mu .of7oh 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 and an area of n0dj1l *.e+ o yla1)wz4wnyim$0.40 \; m^{2}$ 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 blcv , eeqf0 .84qmkrodhbg w:311 fp2and 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 horizontf(g*xq ohek, qnq:: a6ally at a location where the downward component of the :oxang fq *, k6qh(q:eEarth'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 velocuj7jrlg+ .( rdity of 2.0 ra(lu +g7 jrd.rjd/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 hasv(vyyw-g ,klsuh 15d;npe.c 3ae*d4 l 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wi:p36ezi yxzg -lg b.+cre 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 rectangulakthax* wvl/ 7(r loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotaaw /t7*(lhvx ktes 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 to0 w *8*m1kq/w ir*pc gr,ry+xrifec3urns 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 t+zdhs/q( yq:ys,/wik o construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. d/sq: s /h+,ki(wzq yy If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a gen2kj x4jq)6al m9ehf 9aerator 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 havt6c 3sn:d6p tvund.4 kuiet+6 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 6.00 W. The motor operat)-n9pr2y.xk ; a l sqz3etfv1zes on 120 V AC, and when running at full speed it generates a.-9)1tavzze f3 ksn2q pyx;rl 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: gbew(g8ygr 5:jilf( connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up currenti5 ::8gy(rle( bgfwg j?

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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 nln+bq z50e9qu 3e) zo24-V power supply. The operating currentb3l9zq oq5eu )+ en0zn is 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 24qq7s (+uc gg8p-V power supply. The operating current is 1.0 A at full speed. What is the b+qgq8 p(s ug7cack $emf$ 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 redu 1rzfnt87smw 031g vduce 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 cae1xwzx -j2 segi1 b9dzpu(-p+uses 14 A to flow in the secondary. How many exd-iezjzg1-xpbw2ps (+1 u9turns 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 mb(b + ddlsn 0tyro5:u5any turns are necessary in a 110-V primary if the 24-V secondary has 100sb n+od:tyur( b5d05l turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-t9fy e+bczd 19yurn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the d1c9e9+byfy z 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 primn xpk(a* rbe1onu2:o( 1sjy, aary of a transformer. Assuming 100% efficiency, how ejr,n k n(o1p2by1:u aa*x(so many amps 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 7500 V at 10.; /j54uml+me gqy0qv p0 mA. The primary coil operates on 10;ygml/qujv5mqe 4 +p20 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secj3dzr: r/ctech c44rdu 9m9g.+r sgw7 ondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondarg/e.:w 3z9rmrtcdrcrcusj 9 +4 gd47hy?

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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 j skm 5 wwio8-o*9dfr,on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 Aw r5so8 ij9of -k*mwd, is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer hasm h+m1bi jo27aqc98wg 100 turns and its secondary has 200 turns. If maow 7+j qi12g9bhc8mthe input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer hal80v n hb a 0lh*mrac3;9l1vpos 100 turns and its secondary has 200 turns. If the input voltage tv38alh0vl9noc h ;a l1pr*mb0o 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 its secondary ha9 04jyb a g7(eg darj 58nfj:rdtn-9qas 200 turns. If the power input to the primary is 100 W, we can expec a:dnejar8 g90rg4 -5(jj qnb7yf a9tdt the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 4/o- fwdh u7:nz9vdk) bg0 xnuA of current at 120 V. The voltage is usually stepped up to 450n/g ):wx o9470b hd-d uunfkzv0 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usua)vndr8dr) 64t0 rem oblly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage powerr)4vobn8d)m rt rd6e0 lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually ste j,+ qt zgsth58)54dvs zgv(bcpped up to 4500 V by a transformer and transmitted )85zz4v htvsb sq+dtjggc,5(through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission lincqg+ 1o3 ,ut5 k9j;cbksd; wvve 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the s 1gkwk d j ;9vb5,t+vc;oquc3transformer 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 lozmpvxr:/*b a0 ng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce enr:pm/b azv0*xergy 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 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 a3sie* c+s0 gx yv 0fcfm.1 fsij3v0af4t 1000 V. How much less power would be lost if the power were transmitted at 3000 Vc0*ix300 4v1e fi vg fycsfjsa+3sm f. 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 x3:hew7gk: ayis 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 stepped up with a transformerha 7yew:x:k g3 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 stored /3svwlr wu8m )in the coil's magnetic lv3)srm /w w8ufield?

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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 contasf5q j /hgvuk5lo /le)nik :-o,rc 8j;ins a 6.0-W resistor and an 18-H inductor. What is this circocsu/ vlj)hne5 -rfk;,85koj:/ig lquit'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 wher7iohpr sft .)8e the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the k6skb w/bg cbxf 1)c/4peak 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 imu0) m.r*l,cchhze .a 120-V AC outlet. What is the resistance of the lacl. z*hc0u r,m mieh).mp?

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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 connec4mx1cb6 sh87fqn8ay pwg+rvq) tf vm 0b027ypted to a 120-V ac power supply. What is the peak current through the resist1 bpvw6fybmrqn847a0 7 2x g0cqv+)hfp8yst mor?

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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 1e4g)n 1-** 3irqikoqtd*fyc e20-V ac power supply. What is the power dissipat**rqg) ficnq i*e 1d-t3e4okyed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 526r2,u)l6jrs)czo 0 ggtx tb x0-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-W resistor7qmg9w+ m db0n 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 resistor is g-mrzg/ xpmx+r 8nd;9 $I = 0.80 \sin (240 t)$. 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 oflkixm k*c(9( h 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 akaaa7m v (l4.v 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 will a 14.0-mH coil have 14.0 W oi; 9o;fn5nei y:mv/p ff 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 ge0y0k4ofh:0 es ng9yzk, 73mhi9vsz 157 W of 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-mH inductor when 120etl 9zbb )pr/o:apmkp0vd ud:.052eq V AC at a frequency of 20 kHz is applieu .tq/2ekzvpd m: )5 p9la 0er:0dbobpd 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 sourl j2gm2q)0 h a;ykig-kjss91 oce?

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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 :(fnj-c 3br,eqnf fac .m(jv*h 35sitcapacitor 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 ilmj;1srv,vl+3(o cg,6 p qksfs 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 reactan.l3y hwyq a*:yce 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 capacisd,w 1t7 db,ntn-b;lx tive reactance of a 0.010-mF capacitor be 100 W nbdx1ldt;n stb-,w,7?

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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 capacitoxa3zgjx7ld q.w1s w;y( 06drhr 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 12.0 W resistance, 15jz swf* ,gl-8z.0 W inductive reactance, an8 ,-swzl z*fgjd 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.+gq/eu2s bbv +)yu/e n0-mF capacitor are connected in qne s)ue y/v/ u2b+g+bseries?

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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, an0i /2lx lf)zchd 1.0-mF capacitor are connected in series?/)z0 illxf2ch

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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 isv * pgm, j.t6yq,ql7gcqrs* u7 connected in series with a 20-mH inductor, what is the impedance at 1000 Hqc v j rq 7ys6q.lgm7*,tgp*,uz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what isefs1gyg 1(r x7 the phase s xgf1ge(7y1rangle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a serie,page twcb. ce-69*s os circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W t pb-*o,eg9s.a6w cce at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with3qy ,.vf hq,jz a 100-W resistor and 15-mH coil to get a total impedancjyf hq,qz3,.ve 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 z2ob0ycs;kx6hu5 *bu 5000 Hz for a tota6u*;bks x0hzu2o5bcy l 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 +1sjuzlar0b (put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 1bjr ( z1+a0usl50 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 cn8wv e,,r hd7zonnected in series with a 20-mF capacitor. What is the impedancee nvw7, r8,dzh at 1000 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 seriesi g9w oajrxwv8x ,2ad 0; jee(bk-a5b; with a 10-mF capacitor at 1.0 kHz for a total impedriex9(oj ,b kadxbewa5 g-;jw8av 2;0ance 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 h2+vfb1 zpmjgx3 6g i410-mF capacitor at 1.0 kHz for a phase a 3fhi6x1vzbpj2g+4mg 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-W resistor at 1.0 kHz for a tot(f :ieo k-ifn/al ine- i(i/f:kof mpedance 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 capact31nmo )hl6vt itor at 120 Hz. What is the phase angt v61 )mh3ltnole?

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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 4mmfmwnbikg.: pl9whssm6a+ iia6 0k u+a/*(Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecsw mk+iisf6. ( m/b60*ipaw9k u4mlnga mha+:ted 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 597 9q.xnjzp y8q vythconsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit itnzh98yypq7.v x9q j5s 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 reactanci(vm/qn.ip1 qe 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this ciii.v(n m/pqq1rcuit?

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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 circ aj z( pq))9-u8iw*nkqnp r-mgg3: njruit containing a 50-W resistor, a 10-mF capacitor, and a qg93- nkjr -i (nr)uwpmgz8: j)qp na*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-q;r8fe/dzk. aj/x9zhW resistor for a phase angle of9 .8kzj/faed rqz/;h x $40^{\circ}$ 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 freqonz5 r9me d(ul4hz 259 qa-tjvuency should the ci 2v eho(-zml9qut45z5d9 arnjrcuit 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 resistance, b n,(9pge 92ojmi 0chx15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power suppl9j xicmo pg2be9(n0, hy?

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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 isfy40 cfwirr 34 $63^{\circ}$. 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 ofi62fand5 5k ap 60 W and a resistance of 30 W. What is the power fi2a k fnpad556actor?

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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 fot(-(pfv*8kab ts. a pzr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplpkt-stb.f(v(pa8 *a z y?

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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 capacitor3 )5jq6cy:,brbdlbvz and a 15-mH coil in series?b5 rvq:bz 3ldcb, yj)6

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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 tdupj+m v*+gg()6v pf 4.7-mF capacitor for a resonant frequency of 10 kHu)+jvg fp+gmt( p6d*vz?

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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 resonavx;4 spmbd .x)nt frequency mxd4 x; )vbps.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 must be placed in series with c,n z3qk,r(/f5tr measg 9i b/a 30-W resistor and a 40-mH coil if the resonant fas/tmk/,e , (r35 bcrfizn gq9requency of the circuit is to be 1000 Hz?

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