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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 ofu1, idcge-gi0 magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inducti24drrku8:6-wm)d cl jkumh3con states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops oo/ r1j*h p nl:i*is,lwf wire in a coil produces what kind of change on thelo: iw*/hijrpsl,*n1 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 f+hpa;th0g 6c xield through a loop of wire produces what kind of change on the induceax;gc p t0+hh6d $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of:y b0ul dtd/t. change on the indud b.y0du/ :lttced $emf$, 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 fiekejq f9ns/ a*1ld 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 induc. +whcsl(2asts) tw/ced current in a conductor will be that which tends)wwlhs c ct( .ast+/s2 to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abompnrttao0f g3 372xg5ve its center with its north pole pointing down. The stationary magnet induces (when vi7n2f ot53 xga3gmt0 rpewed 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 aycnpkg 2q cr/.-zo+;w xb,e ,qbove its cen-cc x k,wz/;b.oerypqg+qn,2 ter with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field veqaea kk7bqx*yw,v f* 2 g8/j4vctor points straight up. The magnetic field vanishes suddenly. When viewed from above,j kk,qv v y2/xa4*wae* q8gb7f what 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 magnet5vl 2*p5xh6gn(tvqcm ic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this col(tn*m5526 phx vqg vcil 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 wher5j a+or8tsf w0y zuddw 49ek,(e the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of theo+dwr,sz0u tey f5d w98(akj4 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 c:r m1al0la (ztarries an ever-increasing currt :0z(aa1ll mrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole ebol if(hr* c,7+obtd1 ntering first. As the north pole enters the wire, the induced current will be (as viewed from aboobi*l,o hfr1bdt 7(c+ve)

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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 -sk w6fx5-6gpotd1u his rotated at constant angular speed about an axis whose direction can be varied. In a region where a p1wk6-fdo6 x5uthsg- uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoselw/2jvth yx3hyvzxy 6x2 +)r ; direction can be varied. Ihyv;rxj w/+ 6tx22)yzl3h xy vn 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.za5b 0l+an+x zyczt06
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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 aj* ll7wtp2d;9p:lzwp n $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. T4icdcz.- zm3l2rk3p o he $emf$ 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 moved northward at ho;vz: j 3 eeiq8 2fdb6ypqj06cons308q 2jhy6q6i;:ee bpvdzjo f tant velocity through a magnetic 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 con -g dp oqq*r ssp;k1lsxz20.5pstant 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 transformfp 8fu*n, /ri o+qi:xgeferz/fr y(5 ;s

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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. 6gsmx;:)kn o a The frequency of the xo)msn6;ka g: $emf$ 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 ysbp/6y25np fk+x ;ox(:gmu( 9ve b+pby-pieused 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 dev f3 ht im -w0-c5k el0,dfmyn5p05wtgoc51yjzice 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 2 mi2qfr8l)uocoil contains more loops than the primary coil themrf8 i2l2 qo)un 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 containsz.kn da; b.p9d6vvme4 more loops than the secondary coil t;n v.eambd6z d9k p4.vhen 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 poweck/:ds*zr t s(r 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 resonaqa 9yom0cbyl6kf; hbjvy,)e *h ;*u(knt 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 idd m3 k9s/,dvlneal battery of constant terminal voltage. At the moment contact is made with the battery, the voltagn/l m v9d,kd3se 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 battery vu l4y/tto83.u( ecz2 vj8rc qof constant terminal voltage. At the moment cont8/4 ttvcl3.v2ou r( jqyczeu8act 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 inductance L and resistance R is connected to an ggmkg;6lgh r5zx(w9-f a.f:+s;qes) a 7m epx$emf$. 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 resista3 i: mygb3s4tjnce 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 inductord:-nqbbki 71x are connected in series to a battery. The time constant for the circuit represents the n1di7bkxb q -:time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. 0q,7r6j1 9 iscyb dpnfThe battery is suddenlyq7 16n,f9yir0 p csjdb removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following havem/ix mythh vf23:.m2x 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 connected to an AC power supply. On this circuit, cn8by* s8hy ;cthe 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 wcpgs6jgf2 jsss: 5/ e(z7.gb this circuit, the curren gg (/ bcw7jes2s.zs:s5gj pf6t

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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 uah ri3w0ynr :7+w ;6zf u6zinby what factor when the frequency is tri6u7i; :ir y0uzrf+ wzn36awnhpled?

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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 thi,x.2;;q j rb3sz aysoe AC voltage across an inductor is doubled, the inductive reactance of that inductb3o;s,sq;a.rzj2 xiy or

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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 jlq05udkw 16 *imy zqr: u5jf2an inductor approaches zero, the inductive reactance ofuqmzyj5ij05 fuk 2 r6l1 :dq*w 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 connected to an AC power suppl/ce+7 ifai57bgmfr skq,bi5 f :8r m7fy. In this circuit, the curref,k7m58g/fr5 if ici+:safem7r 7bqbnt

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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 wha wf/ s3s- 4 7fjsoao5jisa*xr8t factor when the frequeo5 fs w3s 4s*iao7j-fsxa/ rj8ncy is 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 capacitoraynz (-dcpt: c 1;0swb approaches zero, the capacitive reactaytac 0n1p:(c-d ;zbsw nce 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 voltages of the inductor and capacitor in j , 2lqunhcxk/igu 6*,a Rci 2g,ux/ qnhl juk,6*LC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defiuc+ lzi. k*ekpy r5b-2ned 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 ofq)4j 0gzfnf/o fk )4cb the circuit increases if R increases. When is g)qfb fc oj/f4)40zknthis 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. ;scy2(2tl ug m The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases i,6rekn6 oy 57c xjye/n9 p9x ;.9noomotx7cqvf $X_C$ 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 doubl71b,aok 7uexl sbu(6w(f q+nme in an LRC series circuit, the resonant frequenc s (k al+o7 q6uxb1uwm7(,enbfy 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 driven by an AC applied voltage. At resos ; gr,j ekb9k 2ukr21/r:jbfunance,

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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 RLC0bu 4wc-r2t4e4pa wb x circuit 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 radi9afp 6oo+snc8v5- 9t ei*s dgkus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetg+np* 5ds89oev6a-o tscfk9i ic 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 pnp m* x8qjjixco9an) :(w16j 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plaxmc*a)o nxjpn(9j1qi :68 pjwne 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 rot, 5nhe 4juyl:e0)f t ykh8qh(lating in a uniform magnetic field of 0.20 T. Findh)hf,5 h uy0jey 4(n qkel8:lt the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singl6oea6kr*m/ rcju; oq ) w:r7ybe 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 changes frntrb7o von9h 1hh;7k7 : tuof3om $4.0 \times 10^{-5} \; Wb$ 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 f3kgk kl )lbcbrbss6h00/q,z: v :+qlof wire on a square frame with sides 18 cm. A uniform magnetic fiell: b/sv+z)q06 0,lkbl kcs: khqgrfb 3d 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 tur9a7ci s9to ;k*0kcdx rns 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 areaslccgxu)b9 /3 $0.20 \; m^{2}$ 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 i y+st( ;5ec4kfo)nm vof 60 m flies horizontally at a location where the downward component of c)t; i5v mfek+( sno4ythe 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 bar5nqnl*yn 2o i8 that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its enyq2 l8n*oni5nds 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 ae+bv t+e7nb 6crea 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 consi + n(+)zhn q vz7my;y u*ikt9.szhct8qsts 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 looy dja7t63)aoedmx2c v;+ .pk; rvh6urps 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 th.m; du)kry6; p j axh7av2d r6v+3etcoe loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area rya5+: h9vrja$0.090 \; m^{2}$ 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 p .t)wxo43q dv/n+z giof 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If twg 3qn t+pz/)od4.vx ihe 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 generator w,uwme9-;nzo/pa ; rflp. vab9ith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.osz eddknni9m17w3a+.-* thw-w tr)c00 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 resyo4dnh0q+ (ye istance of 6.00 W. The motor operates on 120 V AC, and when runn onedh+0y(yq 4ing 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. Thfxwhww 8 dtjl 2pyf8k9a58cjk)2 a- 3qe operating current is 1.0 A. What is the star 8a th)w2y q8l-x j3fkw89f2ckw 5dpjat-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 6ou (i3*t/w y/ 30tm,vhq gptet.0 W is connected to a 24-V power supply. The operating current is 1.0 tuq,o/im33gwp( tt*hev ty0 /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 connectedk:bq ry /,1 3jsuu0kez to a 24-V power supply. The operating current is 1.0 A at full speed. Whu1k qsyujkr :/z,eb30at 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 afkc 1 j6apwp29 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 transf+two qv ,l12imk+q bh9ormer causes 14 A to flow in the secondary. How many turns are in t vlh ,mk+ibw+ qq21ot9he secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V prim4.dw bv g/0e3az3mo feary if the 24-V secondary has 134efb0/ .mzgedv 3w oa00 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 opdw.ge71 o p6ga4 4gyxs7fbs. f a 500-turn primary coil and a 2000-turn secondary coil. If the curpgw14yo7.gdf6bp ges 7xs a4.rent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effic3bq*domhrr0 v)wsd/kd 9)f i 3jx0f4 uiency, how many amps at 24f 9k dirm4dw0q b0v/ )jo r)s3ufxd3h* 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 transformz0fjmgaphqtvv7a72hf27 8 09v/yqpg er provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primaraz0 a0vh/7mft v8 h qg9pqjy2gf2v77py 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 31jz; jye.i uocoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to th3y;.1zejoj ui e 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 ti(z+,;(3xltfm7qu r6 n+yc dhez ksq+urns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what h3 l+xzq(ezrn fdsy( +q ,7+;t cimku6current 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 second4o e9k)dl9 i9p qf4hzdary has 200 turns. If the o44zpki)9l9q 9h ddefinput 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 has 100 if a2z;ah ;;-h bgvxk9turns and its secondary has 200 turns. If the input voltage to the primary is 100 V,b; ;g;h2 zhafvk 9i-xa 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 turnr(wd 2fgyq5s dnj/y 7,s. If the power input to the primary is 100 W, we can expect the power outpug5(fyyqdd7 nr,/s 2jw t 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 produces03gykmtus4)s 9u(gc :uks t;j 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throkj:kgg )( suyus;s9ut3t4c m 0ugh 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 curreng9d0bob ++3z,3tyy9ac:b*told mio j t 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 th+ bd+, t0ay:o9mzbid tl3ocb* 9jgoy3e percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curre72q6cc xry wj-nt 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 iywc-q6 7xrj2c n 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 resistance77 ni y*3xfr+4c,egs1a c qeaq of 0.60 W. A generator produces 100 V at 70 A. In order to reduce enes7+xnef q3r,gq1*ce7ca4y iargy 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 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 0lbknl.i 0g5*l0+xzf 0 t+rz ez.60 W. A generator produces kll b5 n0 i0.*rx+tz0lfe+zzg100 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 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 (fd whelm7 qv18:ql; ka 6-W line at 1000 V. How much less power would be lost if the power were transmivk7 m(q lwq:fe8;l1 hdtted 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 isdvjexjawj c 5*6e-s1 - 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 transmission is not to exceed 0.010% of the orisjvce- djx5e1w6- aj* ginal 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 sto jsxrc43zr;dv t11 h,4 tfuo4ared in the coil's magnetic field 3cttu,fdo4s avh1r j14;4 rxz?

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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 inductk8 msii4 lg3q 0/*fr3j9 cgiator. What is this circuit's time cons9 q3atgl/fci30g 4ij*mkr i8stant?

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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 circr0kx; 73b) d1trihsrzuit 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-gpyxpc,5x)q3l 5a u 9qV 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 outl(vd/0zg a;hcl 6jxr 6d bzj/z,et. What is the resistance of the lamp xbcl jz60 dhjd(6z g/a/;z,vr?

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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 powejbdk *:y8(my3a7wgoc r supply. What is the peak current through the resist7jy8o *y 3dwg(bamk:c or?

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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 supplv5c5*v dw dep5v(pce5 y. What is the power dissipated in the resistorv 5 edp* c5pvc(55vwed?

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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 rcp(,- wy:r,g9o4 fykl54gyc4hite eaesistor 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 (sd2 xjh eu3d krjd54.50-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 a k(l cf*)gbwq y3q.4na50-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 / -.n7uvod ocmat 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 2yt7su 9u3:kb .b ig6fc fs2sxp.z/fo 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 have 14.0 W of inductive reactanc4obu0x kky p,* nnqo7;e?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessaryv/bho0 i (;sqm 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 wt. tdody0tj* eyir (m-f,w2dr5; t3sfhen 120 V AC at a frequency of 20 kHz is applied to it?ttm;es5* diy.r ftfjty(3 d2o,d r-w0

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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 Hzq8 ;s xkcxc7 (wqj-m28rvvw l9 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 ah;+8/5 i;g 78ysbybl yivdqjm 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 you71)6 k 4ooo ifxt7fg5luwhv86+k gneeded 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-iwz- pvqc72s/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 reactance of a 0.010-mF capacitor be 1 nco- cw51ua8t00 W?cct8 5wuoa-n1

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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-o 7s uti6.am*sv+-c homF capacitor 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, 15.0 W i3 3w qs8hd xb7bv3i7isnductive reactance, a x3wiv78bs dhb 3q3s7ind 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 15,hut a1l84x c0.vr8nn-(dlt reahj ,b00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capbt ed,vah8aj4n (0u -l.rthx c8n1lr,acitor 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 1500i o 3(d9h70i 3gfvqmgr Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co 7g(o09di 3hgf3ivrq mnnected 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 conne g xif:z tq.;v.ao8vl*cted in series with a 20-mH inductor, what is the impedance at 1000 Hzqtxl.;:a fv.8ivo*z g ?

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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 is th7qh:2 sc/ -jek(gu 0y1gf h0*jiyfvjfe phase angl-jg2vycqu0khfgff0j /h 7i:y* 1ej( se 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 series circui pl4q5. 2mukvot with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hz?v 4klmoqp. u52

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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 with a 100-W resn ags7y61 d /fqp:+pmdffn6/bistor and 15-mH coil to get a total impedance of 110 W at 20s b7/ff+q/mdnp1yf6n d6a:p g 00 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 ag -, btkxu . q/d,ue4wz63eehqt 5000 Hz for a tot4/k- 6ew, q,zd3xqee tubg.uhal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a toxshr *0h8icm( tal impedance ofhr0i8cxsh * (m 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 capa xwj 2kafgmt ,e535fc e(7ty7xcitor. What is the impedance at 1000xf(5 ye 2mf g k7jatwcx7t,e35 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 i 3gv.41z nv*z6i*rj gs8t8c sb:wrydh n series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 vrs1gdc j83** rhyg8t:6vs. z4inzwb W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0k/7pjzh .-lw h kHz for a phase an/hw k.zl-7phj gle 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 needx2 w3 b8r8o gka)ciikeg)m)9 ked in series with a 30-W resistor at 1.0 kHz for a total impedance ra)g 8k8) 9cmikbi kw3 )eoxg2of 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 seridnk i v,/2,.9lxz.ew nhfj j8ies with a 100-mF capacitor at 120 Hz. What is the phase annwxz,di8fnlji h2v/ ek,. j.9gle?

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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 ak(apca hd j te76lj4 brg 8 (a3ebv3jk;g.wy2;nd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor (84a vtb;k3;7g(3.ck2gyjrb6wede ha l jjap 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 1 fodynxg4/thr3.xh(l js-y 63 00-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cur(f d6o x3ty/4jsr lnh-xgy3.hrent 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 capacg- .kg7sr-9jrp;sn m-zkb4s pitive reactance 30 W, and an inductor of inducti.j9gs47rpk;g zp-skr -n m-sbve reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a serix 6p crec l-b11*c3yddq4;tnees RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz t 1cldn1 r;cxcebqpy*643e- dpower 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 witf+ ,lnujbyc,, v-3h mxh a 500-W resistor for a phase angle of ,nb-+u fhj,yv3,mc l 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 -m *c6 a-/y, mafs42lejdwvyf, C = 10.0 mF. At what frequency should the circuit bemaf- 6* aljm-svf/ y2cd4,y we 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 resistan:*w dgu - 7ikhmmos6)cce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?6us*kcw-m7i: h od )gm

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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 ani(u susay g7fx7 */o)d AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a lrp1;k3mg h:- :nbyb qresistance of 30 W. What is the power factor:hl-bn 3:q;rpg kb ym1?

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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 qmo cvpxv(261 a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductq cvm6p2oxv(1or, 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 q qu3i19fp i-n1rs+io-mF capacitor and a 15-mH coil in series?+s1 o 3i9iirfupq-q1n

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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 for a resonant fg7tj rbudpy) u5/j1/c requency of b) jy1tp/c7/u j5dgru10 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 in series with a 3.7-mH in(fq 4tx 8qwm2aductor for a resonant frequency of8xa (2q4qtmf w 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 a 30-W resistor and a 40-yq7 5 ;bkg(m ap8:uzwgvv.*:pgop (v pmH coil if the resonant frequency of the circuit is to be 1000 Hz? (gpavu75p.g ;yw*:ovpqg:kvmp(8 zb

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