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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 ma7 s8z8yp eys2sgnetic 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 stwhqyr *9(wluge9 gg ,o +r9f3)qj fg3vates 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*5d zyn sah,fj(- 4rk5oir l:j coil produces what kind of change on the induceioh( yd rr5k afs,:54j*l-nzjd $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a l-no j 5gqc .3gxgqvb)3oop of wire produces what kind ogvcoxnq.3 g3-qjg) 5 bf 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 loop of wvq,3 +vv t2 .1ci p8lsikp8zyyire produces what kind of change on the induceds. 2ik83+v i1vtlypy cpz,vq8 $emf$, 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 fielk3 5ur9pn,uttd 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 3q:s/ hvkkxym dk,1s2 an induced current in a conductor will be that which tends to produce which of th,khsd :2sk3vk y /x1mqe 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 magh;niyyox :6c0e19xtv net is held above its center with its north pole; yio06x 1yn9:exvthc 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 ji);kx4gf vg 2k vktjst,8;m4horizontal table. A bar magnet is held above its center with its north pole pointi 4k8 ,vmit4;vkxjs2gk)tj f g;ng 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 table top in abd+uicd* 25; *:p:vx qpz ntug region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is t:ucv2z* d dtigpun+*xbp 5 ;:qhe sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a4u/3az;+l8 hmku3 lvdchc6r m region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whenu3am+3dh rzhm/4vl;8l cuc6k 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 2lbsb2l:nx0n( m. -zkrff: /i:qfyp y field points straight down. The magnetic field disappears suddenly. When viewed frombxf lqn-fyn:r:./smk 2f( 0i bpzy:l2 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 vf8vp,pw 9o/s6rd os+carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When p/ of6r 9dv v8,po+sswviewed 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 loopqi1p st2yk3r3 of wire with the north pole entering first. As the nort2rq1kt 3isp y3h pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angkq *uy 0kf2-oy *a07n7 8ojycxqatmes9yb+p6ular 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 a+62q7 b-9yoa80ak*pj ckoxs0uyn m7*eqy tyfxis 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 *4ox5s;mi9qhtl5izkd : ,ey c( iq lg-speed about an axis whose direction can be va:lo,mx(-i 4 q5;q*9zedtc 5gisliyh k ried. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.gf xz qz90to/wl6l/w 7
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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 thiu5v;f4syd.o at 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 ft 2xq0u0 iyhf gz*eq .m,0llc1ield. 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 igdq)kz7x j64/qktm d *n the east-west direction) is moved northward at constant velocity through a magneqk 7xgk4)tq/j6zdm d* tic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a c xrug*chlwp o3-/l 5b)onstant 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 trazxy+-le zyi:i g6(bs3 nsforms

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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 fdv 4z i fa4u):xrvymte6d74g 3requency of thede4 uvv 4)m4rxaiy6gf7dz :t3 $emf$ 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 devicv d) qjwa y5yc+5gt 1ext(s)h)e used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devic; :k/fbx)zzyb lwb-4ge 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 loops than the 215kuqj ;ywnj4x4ndyw bs +-x primary coil xny524juwk1sy nw-j 4qd+ b;x then it 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 co62/qjbm;nxo;k,k hu aa4*gcl il thenx/c;* lon 6j h;ak,b q4am2kug it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, thf44 sti*fb m*alj*8 kqe power 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 resona .2n3-b:*hi fwpb ykqrnt circuit,

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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 *t dk: 6 bx1o.ju)9 sjp*uwabsideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltag*)b:b tsduk1apxjjuo. *9 s6 we 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 anma th;twl,xqc z;v,hltuq*-v .lj 32, ideal battery of constant terminal voltage. At the moment cont2 *, vtjqtwxcv , ;;qh,lmua -l.hzt3lact 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 ce;mc) ejachp :z6r3 n(2e5e qinductance 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 inductancpu,57 oj8suti a9 0ml i0utecq7j/8fse 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 battj n+qc;:qht.0*obn2 q,k c7b mc)kootery. The time constant for the circuit represents the time required for the current t 7c2+:o m n*.oqqq cnb;o,)chb 0ttkjko reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connectr1hfm7r4z ; oied in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time ref7o;4hzi rmr 1quired 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 same umpw mgah/.gbz295;dpa p7 v s8nits 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 connectetosz0 go4bgtp8x.86dd to an AC 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 h f0o/sp3.u tkan AC power supply. In this circuit, the currentf.u 0sh3tpo/k

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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 anm;:f2a vospxm no)oy 86qwo2+8he c/i ac circuit changes by what factor when the frequency is triple;82xy o mivswon8)oa cem6/hqfp+ 2 o:d?

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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 inductoru.x:hfax 3sz42u0xd t is doubled, the inductive reactance of thasdhx:ut3x z axfu420.t 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, jn5p6gv c.4yr +sui3uj 8 i;unthe inductive reactance of 6;uj8ugi3 +.vr 4pus ycn5injthat coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In t .i;t hn0kixim c *4l:atxjjs;+i3 lc-his circuit, the curreis 3t*+l an cx 0mljki.;txiijh;:-4 cnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance inj4 bxcb2u4j)scv+ ;a-aeyf -d an ac circuit changes by what factor when the frequency vc-+jx )f y-ebd2 4cus ;aaj4bis 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 capacitor approaoo+-m x6rkj2 eches zero, the capacitive reactance of th6okj-2rm+oex at capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor inadv:nlw;r0pww 8 snp ; x3/ly) a RLC series cirlnwwysln p 30ax dv/w);8;r p:cuit?

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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 definyx,l dt9w n1dv ((l(yaed as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the ciexrdmw h -gxpf*q9 4uvmx-s,q:j 23)prcuit increases if R increases. When is this statemrxqp--j,wu2 )sex :mg xqfv4m9p h* 3dent 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 ths oy nl2l0s6j/e circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increas g v0 0qjn1d1dw:ah2j/; gsxates 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*a;nl uh*x.2az ,xn (z+dvwgz capacitance both double in an LRC series circuit, the resonant frexd **n.av +n(zzul h; wzg,xa2quency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is dh h. b4ll u03de;7yr4mj;gc( (xm rfxuriven by 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 cibz-e5ov2p-yv; qmsl;u i:f :gk, w+fmrcuit 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 radius8 )d1yya;y:68/:1fw gcrh w aqa2wnd4ouhrdr 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through thfqy1aayhr w8rd d8c 26yrh/u)4wn;:1:oadgw e 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 rs7l,7okq y *gkotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plangyk lk7,o *qs7e 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 6:) b48j)dogk:bdy xubx2 yvcrotating in a uniform magnetic field of 0.20 T. Find 4 k::ybxxg jo) dvbcdu6)28ybthe 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 reduc3;fx6 8u+s7qeoxc nfwed 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 from i: a+5bea+bwr $4.0 \times 10^{-5} \; Wb$ 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 a3e;53bn7fvb lvfijd, square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the f j b,nbi;7lefv33vf5dield 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 efjt4f ao c1lk.o.u-5scj-m: of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and kb 1ahr,is;;x 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 608 rmbfe 70cpabvmf7(hv 6(u +b m flies horizontally at a location where the downward covarbm +vue m 6(b(7bph8 c0f7fmponent 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 )j/qs+4wvk rx6bf.ir long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a4).6+b ikrf jx/swqr v 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-sectionm; . wocrm lr9,cuag;fi:4ne )al 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 consix2nv7 lmw nn-,sts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loopsx:x.1vn vjb s) on its armature. 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 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 voltsbvx j1vx :.)nage 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.j9xxfodq.i(i7 v *mrns 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 wii(+ s)p-l 1timiw/-rfqgd8 bk*dn5sath an output of 12 V maxi-s(w + * g-/rq51ii n)kd8biatdflsmpmum when rotated at 60 Hz. A magnetic field of 0.050 T is available. 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 generato: w/5u aiqqvn2r 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 motl 0 3yv(qfv bl18miy4s4 mbv1oor have 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 DCkazc,h qo+4*o motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it g4+qoahcz* o,k enerates 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 pc5 d (tw; 7f:lfeai ia;i8l)htower supply. The c) f(a;l dfte5i hi t7wial:;8operating 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 connected to a 24-V p;-+s3lkf7l2 f m/4kfgb ssdq mower supply. The operqm- s7/ sb4dkg+s32f kllmf;f ating current 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 24-4a mzdr:e6h/0o 5fker3iuxm 5V power supply. The operating current is 1.0 A at full speed. What is the back kod:z36rem 054r ahmiu/5xef$emf$ 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 zvr nb )9zl t *5c**q*tdcy;ehreduce 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 9r kfuv6* p0ws95jtk :obwyk7causes 14 A to flow in the secondary. How man9j uw: ky05t6 wkpb7rv9k* sofy turns 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 ;spo zr9i3 8tmnecessary in a 110-V primary if the 24-V secondar8 ;zmt3 ios9pry has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil anlrcc1u:d-o 7bz6xr8bf r9sl ; d a 2000-turn secondary coil. If the current in the secondary is 3.uxrc1b l8:7d r6ocb;f sz-lr 90 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 cuqb 83 ntbb9+-h8mq ba transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secb9bnqbut+ m8ch-qb38ondary?

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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 wq-o3uz8zc6ha neon sign transformer provides 7500 V at 10.0 mA. The primar h3uc8 w6-qzzoy 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 pu8: 74l d5o nxir+hqgmkt(*cm0yve9 orimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secono x(c 5i8erh+0glt9dn ok um:vmq4 *y7dary?

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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 turns on its s5y 1r u;qodtn2w,we9 zecondary coil. If 120 V at 2.0 A is applied to the primary,w5 ,;9e2tzo qd1urn yw what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns /hw :o0g2gdr 0kf5ais )pr 7wnand its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the s2wiw)p gr7o5d:n gh0f0sra k/econdary 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 transform2,ff8 o -hpxlger has 100 turns and its secondary has 200 turns. If , fg f2pol-h8xthe input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turyjy2v u scm(wc/9k bzd( /7ee4ns. If the e4m2 7 euz/(bvcw(9sj k/c yydpower input to the primary is 100 W, we can expect 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 A of current at 120 V. The voltageeh vu b7 ;x.jyec:-qe- is usually stepped up to 4500 V by a transformer and transmitted through a poweey -7xbqh-:vj.ue;c er 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 6; 2jvi 4kahirof current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resisva i2h;k4irj 6tance 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 u37kozcm+z7d of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped uo7c+3kz7 zumdp.

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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. p5f)w650 vyq76t* rpfwv gwjxA 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 wij6 wrgvtyvfp5w *pw75q)06fx th 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 (hq/ c.f,n(dn tfsb+z 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 origina(c tqn .bs,fz+d/ hnf(l 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 f)np*c4au5u k4 i b*1eiehev- power would be lost if the power were transmitted at 3000 V instead of a-)v5 pkiab*eue 4*u 4nic1heft 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 gener(gie 47rcw pg,ator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transm(ercgw,p g 7i4ission 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 (on-k p+g6jpf9as:c tis stored in the coil's magnetic fieldoj( p+a6c-:st9 nkpfg ?

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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 hw8 jibg 9+,fxinductor. What is this ciw i,hfx+9j8gb 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 in an AC circuit where the rms v1f5o5k7 k+p5g hu eirooltage 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 12 gu,wje;6 :hncxlu cuh6d .+2k0-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 outlets+:bb3 j z*cyk. What is the resistance of the lamjb kz3cy*bs +:p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the pbc3 xpm94.d thhl irqni4+*,r eak current through the resl*ixqh +,c4 ndmb4rpir 3.th9istor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powb*wktf/-nayb-,bia 6 er dissipated in the re y ,6-a/bafkbbn*-wti sistor?

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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 resis+wbnib43 7qqq*)nz zftor 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 is j r. +b)k eqf z0g8.edw8*h)-rzr uvij$I = 0.80 \sin (240 t)$. 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 resisyrlh - l g xi6c(wavo3 x/xz2ep2tt+(;tor 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 indux(9avhy y3;a/n4nv zci+i4 b octor 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 remr0 ol;psn/ m8actance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil h7c,-7 0pxkwp ge qp :/h5tqjgeave 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necer0;tko nmq0ji;k y8 6e5- elgouns;/nssary for 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 120 V 2hb-zx m(0 iesmzp)s4 AC at a frequency of 20 kHz is2 -i) hzbez 4m(sps0xm applied 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 apqs u -7 6grry2 a74elyk7: +e6fxfqwc 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 y:,k 2+ -xzkexvdort 8k) iek.a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 1+p 0l8*v.o0,5ji amo y7pvn kw/rnuzw0 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 fwth h98ug3y6 10-mF capacitor 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 reactam n5tb7w) 3rcpnce of a 0.010-mF capacitor be 100 W?5 pc)b7m3wtr n

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 u vkm1li 2/t0,g2jfg wV?

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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, 15.0gh0icf oy5wha8kw/g 9f1a /0xey17 um W inductive reactanceh5uyk7y0/ao 1 w 9 8ec/gah0x fwfgi1m, and 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 resise9s 3b) /rla 0ba;akurtor, 20-mH coil, and 1.0-mF c);u a9rkba3ear0l b /sapacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W res;h/cdaa, (f pui5gg x5istor, 20-mH coil, and 1.0-mF capacitor are connected inuc5g dpx5f(g/ h aai,; 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, whi4nm1,lm+b l/o-j6 wm x szv-a7s,j8bd1owu gat is the impedance azo / dmlixj1wbb lm8w,gnm6v7 1-j-oa,ss +4ut 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-ckd**y+ 4r ol tz(5i2slidj4w q-wx)jmH inductor, what is the phase angle at 1000wxq5 - jd tis4y*)l2l4zcw+r ido(*jk Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF cap75ww frkm t.7wacitor for a total impedance of wfw.k 57twm7r 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 capacita*b fo6( w x9dg+gu xuqtwuj.2a3av0l.nces is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W a.ufb6u( dt2 w3 av.w+a g xg*0xujolq9t 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 50qk +rdcsu58 +z00 Hz for a total impedance of 4000+k5s+8uqczr d0 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 100-kW rxpl3 3cqw, l/f;1zvx mesistor at 1.0-MHz for a total impedan m llqf 3wxv,1xz3/p;cce of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF cap76uu m8 ,q: /ttgioubn6 :hmmxq)r2 ftacitor. What is the impedance at )nfqgiuqbuu hm6m 6x::2t8 7,/mtrot1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 1hqfl0mp5990j c,ium0wxtu9 l0-mF capacitor at 1.0 kHz for a total impedance of 45 W?hw 9 jip9fc0ulqu00m tm9 lx,5

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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 .b) 2c6j6t4 tlhcjsnvseries with a 10-mF capacitor at 1.0 kHz for a phase angs )ncb6h tl4j.t6c2v jle 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 resistg j*os iurh 9j6/l:4jxor at 1.0 kHz for a total im46u rgj9xjs: oij/hl*pedance 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. What is (f1:zwo zwz:q w1y j-qorn/: b:i5aqfz)t;pz the phase z:tw1a j p)n-: yo/:zfiwqz5owrqbzq( :f ;z1angle?

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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 uuu. ,g;wt-yf-W resistor, 20-mH coil, and 1.0-mF capacitor are c;uu,utf -. ywgonnected 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 capacio d6b vo2y.in)tor, and a 0.350-H inductor. The circuit i i6nob).vd2yo s 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 capa,8ch 9h6 uzia5o*l f/whtj)e jcitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series tj/6 *fe9hhiaz)8 ujlw,o5 hcto a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, alvv9z il *;vg6xk3fvszlma;c3 z)*m) 10-mF capacitor, and z;zi*m33 afl)mzvk;9)vlxv l* vsc 6g 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 s47xsu mi9fa*w a(wqf(eries with a 500-W resistor for a phase angle of 4s7 (w(f 9muqxaf*awi$40^{\circ}$ 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 0na3 )pqo/kye rztxod,;z5f1mF. At what frequency should the circuit be driven in orq ro5p;kfno,1z dy/)t 0xez3 ader 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 resihd1p,3tx8b-kokxn,jxzg *k 5 stance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is co- to, gbkhkx x3 pn15x8djk*z,nnected 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 circuitzt.v56,rdzqvo e,hqfchrs .-j q 7n.3 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 tn*x1 6gfo (lb2lvm5t-1oz hqimpedance of 60 W and a resistance of 30 W. What is the power factl1ztvo*(oq fxn2 5t gblm -16hor?

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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 conta +s sjlic 3vpto3pxfoi9-/qd0/k ;pc+ining a 50-W resistor, a 10-mF capacitor, and a 0.45+jkc /-v0f3ixl o 3+ spp;p9oi/sdtqc-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 frequency of a 1.0-mF capacitor and a 15-mH c(pd l(by sx6(aucv-f8oil in series?pfs-b8y6a c ((ulxd(v

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor foro bdf8*z53 gbsvqf8i(;j7xfx a resonant frequency o;o8q 85(s3if*dvbx gj7xzff bf 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 ino kk:bnikl ;0- zry1,o series with a 3.7-mH inductor for a resonant frequency ofl rkk;b:-yoz,i ok0n1 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 wispx(5y 5hw:kq th a 30-W resistor and a 40-mH coil if 5:y qkpw(hx5sthe resonant frequency of the circuit is to be 1000 Hz?

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