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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 flux exce f6u-3k 2xtpf4bnd 6hlpt

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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 ztbxs3( vne l8v-r ,c0the $emf$ 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 i2m5bwhp : ub nsk*bf4q;i ,ri5n a coil produces what kind of change on the, uk25:pb*;m4 ifnhsbrqwb5 i 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 0ho ym*b-l.yoiila-* of the magnetic field through a loop of wire produces what kindol*-y a o.ih* m0-byil of 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 wire produ069di hnuq .rem6c7es81 xf mpces what kind of change on the induc6c7med 0neq9sf8rhpu. 1mxi6 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 magnetic field an q5:, yi;sty/ml/ x swe$emf$ 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 directionb1bdv me8gc; 9 mh:u/a f3rtb0 of an induced current in a conductor will be that which cv18/;ur3m:mb hfbba0 d tge 9tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. a-1gn8h ithy 23uwsz) A bar magnet is held above its center with its north pole pointing down. The stationary magnet inducesu-n)2zgsi wh1a 83tyh (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 held abo9xee u- s:0wvx 4fkl1p a;1jqvks.u1wve its center with i;xxjswp1-v4ke9 lv .0a kuwq1fs u:e1 ts north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a tabl.,ktl9 dvrt8 te top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, w.,rltv k89t dthat is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vec6 ++kgtqgi *vetor points straight up. The magnetic gg+kei +*v 6qtfield suddenly 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 reg )9n+ f4lqm-yd08os*sno zkx -cyrv b8ion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappe l8rb d8*nys- )vcz yon+qs-9ox4kmf0 ars?

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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 v y,nbcl3s:k6sypwko38.gh 4 lies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the inducedb:oyv,pns . 3l46hkcky 3g8ws 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 th:m;udl et az,8e north pole entering first. As the north p:d ul,metaz;8 ole 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 consttty -)6 bx98agwugsj;ant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation8gxg6t-j yw b t;su9a) 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 constanjvtqusk9dt8q- )5ys/dqu 0 1vmo6ey +t angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wha6)m0u/dd 1y-+kqsqe 9syv5t quotvj8t 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.v/ ccx3cg6:mtg7 mb 8 :qp5wlr
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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 anal .jnny;) m2d $emf$ 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 l :9yba h6xp0thtla7k6gp 7o3field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moh9x :ijd 0 kn-r;n)nc ew7bm oud+m98aved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pohm87+ndm e0ic9)a djok r-b:uxw;9n ntential 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 velocito ze1,x:hf*6acz jk a1 bv3x)qy $\omega$ 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 tv) s)l4p7 is/svgr cl1ransforms

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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 ;,nl(4c rvag*6hu)ukzv g( fk 60 revolutions each second. The frequency of thk (lu,(cvarz*n )ukgfg 6h4;ve $emf$ 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 uf jv0qn 70 3pd m,nv,pi9i(ib 6xqp4ejsed 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 that 8crgm3pu4v9q 8io2 gd puwi6(

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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 primary cos--v i54.r,tmzpamt dil tiz,p-tta rmvs.45m d -hen 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 contain /1yihkkss(c ;-fprymf)a d2,s more loops than the secondary coilfd) (;icy/p1fhs akmy, srk-2 then 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, the power l pqel,m1999 d.cds /gs f/onqinput

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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 cizu8ll: lcxv(b4r*g;wo sv( 5k rcuit,

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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 au c; s: 8wq1+k:ll:bt6errvy 7f 0ghfbre connected in series to an ideal battery of constant terminab:6k 8q :hu0fb llsr7 1cf+ry;eg:vwtl voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in swqbfbo0d 6l +n.rb0hq8ajzur2 9l2 b4eries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltu b4. qljq6dbb2oa0 hl8r09nz2f+rb wage 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 m ,-mr4y,rs;f-lfolc L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an jgrz32 :f17bndkw k( f$emf$. 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 x/t fg 29t;fy5muhae-to a battery. The time constant for the circuit represents the time r5/;fa92 uty-t mhfgx eequired for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery ik:*gg d22 g*vxysbb6ds suddenly removed from the circuit. The time constant for of the circuit represents the time 2x*b:d* 6ksygvg2 bgdrequired 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 hacrd8 cum,qxs 2 zs*s (rb xvgqi4o9542ve the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connectez9l2hqgd+*)mk y o / 3nup,xrnd 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 an AC power supply. Izk:izd.1x;cpnuk -eg6w:1q jn this circuit, the currentd .np c- jkg:ui:1qw61x z;zek

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frequ- mkfw5+b rwye)1:q +ftn(tc iency isn+tqbf kwi yft+ (m:1r-cw5e) tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doub6 4cuk32 f xdpr8 m 9f4k:vsw,zfq7ecaym9b4lled, the inductive reactance4lk3qxu67 k4 8 mae9yr4wp vdzfb:f,2cf msc 9 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 6elu.; vi wpjsowh y*;cx(( :dAC voltage across an inductor approaches zero, the inductive reactance of thatipod 6;cj(;e.sw uw*y(h :xvl 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 this circuy *m4f* vr,a(pmfjd.1zn:zd fit, the currentmz4zfdp:n.*v, dfr 1 (af mjy*

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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 an6sw1av -)leq(s(7jpdfrf q*q ac circuit changes by what factor when the frequency is qsq*7 j q(w)s(dr1lfp6aev -f 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 approaches zezu(7qsocrk co rlrnx+/ 0v gx0/7m+-iro, the capacitive00 vnz7qcx /uxc romg+ l (k+rir-/o7s reactance 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 buto*6xlx554pq u/ jkz7f.u cg etween the voltages of the inductor and capacitor in a RLC seofugx.qt5*lxp 5j76c /4zu ku ries 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 R3 yz,l1 vu2vowzq gb84LC circuit is 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 the circ g+qcq.,(xukw uit increases if R increases. Whuwk. +,xqcg q(en is 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. Th3 wuup) q26sv8izjv(ioijf .lm839 ure impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC seri2kna:ii+n,:rwf-z-e h omx 6 nes circuit. The impedance of the 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 i 0 3zub0c1urt-2vt anen an LRC series circuit, the resonant frequency of that circuit 3t0bnz - r0cveu2u1atwill

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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 vol9imvs:3 /anxatage. 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 circuit g.cdn-tn rg63es b+ub cz0- 3ioccurs 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 mqj.hw clll z x);l8*:rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planec :mwl;)h qll8j.l z*x 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 rota.gl5s5nmx nv12sfrw,3 4x q usting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are pe fw gqs5xl smv2rxsn3.n1u5,4rpendicular.

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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 magnetic field ofq) q 1c(gqqbc+y/a7zv 0.20 T. Find the magnetic flux through the loop when the plane of the b(+vy)qg1 q7qzc/aq cloop 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 a9 (r5/:svtn *sivju tbdjustable single 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 changex6 j7c z7du+ggoo y4w7s 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 turns1wumbu97oj cmx5c :;msi u +z+ of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average valuezws:i15+ubm u jcumx m+9c;7o 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 winv pbb8 ))jcn/wdz/im0jc ,h)th 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 and ap,4z- (uq eajctmj5k ,rea $0.20 \; m^{2}$ 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 fliesyz la+dw*.zf5he, 5f )e 9nh3ni kyy*x horizontally at a location where the downward componentez*.a39)fy5l +,5hw y*zekdxinfhny 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 lz0 fm dk 8.gc8u3c9pvuong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis thkfup8cc d3ugzmv.0 98rough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional arw2mlucwds- 313pdlo 1ea 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 tusgpw (v 9/god/o)enakfb* 65 wrns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 qjlavms f 0;,/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 voltagv; /0fmljsa q,e of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of are +eofy7oa)z,2mgat +je e( f3xa $0.090 \; m^{2}$ 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 an output of 12 V; (kimn7fnkb *jqy58f.lymj, maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coi* m yjn5f,l;q. jik7ym8(bkfn l 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 generatory*z4.7b3fp9x 8aut iog/ w9yt/kwp wv 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 hr o1-0b hc ce,yyfg(a0ave 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 motb sa:ohg3:ks9 or operates on 120 V AC, anb:s:ao39g kh sd when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply.ruw. wpb)++al t;9o bl The operating current is 1.0 A. Whapw;b)w lauo9tr b+.+ lt 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 26 drvpa 0j/c6b4-V power supply. The operating current is 1.0 A at full speed j6c0rp/vda6b. 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 powerhek,d/q ; t/ohc0xg.m* d9orc supply. The operating current is 1.0 A at full sped9t;/ dc*h q/ge0ro .,xkohc med. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a prkswl. 4ap.8zfuaab; 4 0zr)wn imary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to fj0 i.j i99t1pu5hip iplow in the secondary. How mauj.iphp9i1pi t 9 ij50ny 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 m6yw44wuj o cwqv; +zb3any turns are necessary in a 110-V primary if the 24-V secondary has 10wc6qbv ;w34 4w +yozju0 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 ;60; m 7ga v;:vjzehgz8je)nt.nr vvw 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the p ;) n h 7g.avet;w; 6zj8nvgzmj0vev:rrimary?

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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% efficuv24/(zgd tx i uqg0;p*enw9hiency, how many amps at 24 V can flow in the secondarz* tv e24 /xquwpg (;uh0g9nidy?

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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 10.0w -e0+lti.tvh mA. The primary coil operates on 0t wlih.e -vt+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 gm5wagvx*be voz (q;+,c )x:y1 v8yeu:b8fldon its primary coil and 300 turns on its secondary coil. Ib;+ d5 x:fl1gmveab,oe)zvgqy x:vc*w8 8y(uf 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seq5 v*n0o66o:gedv bnmcondary coil. If 120 V at 2.0 A is applied to the primn v e:0mbo*vgn6do56 qary, 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 and its secondary hasj3opg4 3c1)d( oqhlg bwrl,3g 200 turns. If the input current at the primary is 100 A, we can expect the output current at the bgwqh33dj g1, o)p r (3l4clogsecondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu ;hvt( jb:j1xtrns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secot1tbhv ;j(:xjndary 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 t r3os;;vm*;yf92 hhx mpv n;inurns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fricnvpx2i3 n; hovrh*symm;9 f;;tional 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 stepped umo 7)xt0q1u-s m en/eq pv:ia8p to 4500 V by a transformer and transmitted through1:e on7- v8mpx mqui q0)tsae/ 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 12py-01bw x uws6 (abfp8ub/.f k0 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 lp0 pfy( xw/8b6b.ksfuu-1awbost 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 :b)i7nac + g8 jy3vx03gu jq*imuxv9eA of current at 120 V. The voltage is usually stepped up to 4500 V by 3bqx7imjg) 3v nuei0cjg:8+9u* x vaya 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 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 res pjk;u1p+)bn;)gf xbkn7 w3 bhistance 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,+) pk1n )3 njkb;x;hbpwbugf 7 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. A guhc8ssm5rqhqts 3ow r,3:cz r1p v1:0enerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is steppomtwcprsu ,3qcqsrvh1 : hz853:0 s1red 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 lh /hegwfqg nhpg 7* r;32:xcs8ine at 1000 V. How much less power would be lo3/h*egchwh; g7qp2f sgrn 8:xst if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitts e qy:3nv-vngdi873ged on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the- v:d3vig seg37 qn8yn 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 stow/hpbs),css 7red in the coil's magnetic field sphws c,)s7b/?

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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 pvir4(::bo,jgchwo (8iu7c f gvkb) (a 6.0-W resistor and an 18-H inductor. What is this circuit's time 4wur h ,kf8):jc:ogciv7( vb igo(p( bconstant?

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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 voltag mwl+7rj 0.rkee in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V z8 4vxwc/)ff/yr4vn 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 placzu ,/)vwrodld-o 93jxed into a 120-V AC outlet. What is the resistance of the lavow,9 )z/- jo3ddurl xmp?

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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 tog oufd umu 9u ut1w *2*.4 1+slofvvq;muxe:j* a 120-V ac power supply. What is the peak current through1jsm*;* g fwvue u4u : dmqol+ of92x1.tu*uuv the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V afdewr /t ,u1o(c power supply. What is the power dissipated in the d/ oeut1f(rw,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 50-W r:9ozz2 (q8gd nrg1fn 1zmskst2npq.wg.of+; esistor 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 arv+:i-eebf s :mhz 6-t 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through ai1l8.6k w22 w,sksby vwyb 1lq 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hz?31c auiz:)o sk

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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 ,(jwiucxb (1x 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 havj,55rf+vmnh: v ix6i ie 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 necez6)s ja9 l4ey oj zp8e3bg(1rqssary 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 AC at a frequency a b y(r.aye5t9of 20 kHz is applibr9e(a.y 5 ayted 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.x nn*p:cuga/ /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 1j xr/ur(ufb.r;,w;8(c tf yjr0 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 ote,c u5 mn9) lr.nwcgq1)7um kf capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 W?jtbt (9t*x.fm

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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 react:t1q io7b ,h3yfuoo, a07su wwance of a 0.010-mF capacitor be 100 W ao tw,uu0:i7byo3osfw h1q7 ,?

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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 capaex*f 8bo0k.r vcitor 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 re7 u3ioad a8-:t nawb(psistance, 15.0 W inducu-87pn: ta bow(aa d3itive reactance, 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 uintqg4a)c9:+ u ajk *resistor, 20-mH coil, and 1.0-: u+na i4qk*a9)cgut jmF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mo b0hcy1i,w.gF capacitor a0i1og ch,b.wyre connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-myt6q .sbo:,ihc6c g9z H inductor, what is the impedance att6z:bqos yih6c 9 c,.g 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;xijv,jr/q f 2 a 20-mH inductor, what is the phase angle atixqj,2/jvf; r 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 series circuit with a 20wg/ytddqb2;0) gd /lnw4 t5pk 4l t2wzqc;z u0-mH coil and 1.0-mF capacitor for a total impedwz w;t4 dwu04qt2g0g2ypn;qbldt5z//kc) dlance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in serik8rh/+ gp9 pwskh x.b)es with a 100-W resistor and 15-mH coil to get a totalh.w kh9b+g/ )ppkx8 sr impedance 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 z6 nug,lp. 2 c*aoqd)kunz 4i1a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?d14u2qalpn ),*zo6gickz nu .

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must bh ftv k9ett9;-e put in series with a 100-kW resistor at 1.0-MHz for a total imp9v ;ftttk9eh-edance 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 catjrc e3q1bi567eql3i0l, b l5cg icc *pacitor. What is the impedance 5 1jl7 3b*ti6i cil,5 qlr0g cecc3ebqat 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 sepm*5xqh v5x(eries with a 10-mF capacitor at 1.0 kHz for a total impedance oph55xx eq* vm(f 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 nj qtzsbh eiioo2*, d:i i/3;0k* c8zvj-syqf: eeded in series with a 10-mF capacitor at 1.0 kHz for a phase angle o2v f3, o;szji t:o/i 8jkdhqqiyi z:ce s*-*b0f $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nee ywcj+5nb*sz/7 ro/cm ded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 Ww5noc/rc mb+7jy*sz/?

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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 capac4mx 5t8ibq5s4g,c jhpitor at 120 Hz. What is the phase anglc4i5qgp85tj4 x hb,mse?

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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-mzoa2 w rkow -q a/1:8gecr-a0eH coil, and 1.0-mF ca e:2gr1 w -aaqe-r8wko0czo/ apacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor,f t6jr .z+u5/pz8kdl k and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powe 6u 8+rjzt.zkdpl5fk/r 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 kdz):,r c73cebodaz 6capacitor of capacitive reactance 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 ci)ce dzd,k 6o7acrz:3brcuit?

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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 :zt5c3bl her- series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected t3-5b c:e htzrlo 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 502 l1 crri0 bko*q(b+r *ozy7bv0-W resistor for a phase angle ofrb1b *z(qi7 *2o o r+kcbv0rly $40^{\circ}$ 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 fre d-g tjo :bf8x2k*ho6mquency should the cir*-6xk gm2obd:ht f8o jcuit 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 se.bxx y8 up5,r3jgpx qz6cu, *fries circuit with 12.0 W resistance, 15.0 W inductive reactance, and bg53.pu c,8z xqryj*,6 uxfxp 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 circuit is (x*9q oacxy:0fx4:ibsz7 tj a $63^{\circ}$. 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 qr mzo2y hah0)ww /5y9an impedance of 60 W and a resistance of 30 W. What is the pqw/a ohy9w02hz5 )rymower 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 containim48l3 fgosoji2)jb wj(n r8 a6ng a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when cono4j8l gj f)o2anjir w8(s3mb 6nected 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 a n, *p(at,jcobko/sw-nd a 15-mH coil in series?a,s/* w pj,to-(kon cb

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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 a6 3;fvdclw-g rnm +-2on3kvgf 4.7-mF capacitor for a resonant frequency of 10 kHz?g33+l2f -v; k6odvmgwcf n-nr

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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 witha/ +5.2azygsrtgv:u .8 fvqat a 3.7-mH inductor for a resonant frequency of 1000 Hz.+r2sgtv./ a a 8 fyvta5guzq:?

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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 aait8,f/7+o-r mk5slyauvyv / 30-W resistor and a 40-mH coil if the resonant freq/ify vrslt m5ao+k/- 8,uva 7yuency of the circuit is to be 1000 Hz?

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