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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 flufza;t4yr6e cy0 t,j j:o p6yj.x 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 indurg3l8f 5d7fj pction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on jr27f .km*n3hcqim)rthecmk ).rmnj2qhf7ri* 3 induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field throug6v7lk2rkv9 u qh a loop of wire produces what kind of chanvk kl7 r9v2q6uge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kim 9i45la8qanf- -m:mb xvtj6ond of change on the induc8mi-f a mjab: 5nt4mqov6 9xl-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 ma+qhu9ob/u y b9dyw6:wgnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an ind;qt2vcw )+u t s)v/ vpt4pvcn1kch*v 1uced current in a conductor will be that which tendvv1 sck1ttq)v p)4;2*u+w t/hvp vccns 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 f:ajzbx,q lrreyo. x,c1,.4x on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet in ,, ,fz:orj..e rx1bxlc q4xayduces (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 .sobj .ppz:o9l c7as2 bar magnet is held above its center with its north pole pointing down, and relo9jlp.s.sao pb:zc72eased. 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 fin2f f;k0f4,b wo bq)wfeld vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inducoq,fkn4;fbf2)w bf 0wed 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 5c2 yqb q/uaq1w4kcb5 region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is thq2uq1ykac4 b wq/5 bc5e 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 vkga*q : + 5dgi13wrnathe magnetic field points straight down. The magnetic field disappears suddenly. When viewed fro:q+i nwa gg3 akdv15*rm 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 carries an weyd:h-5 -4xvhseu f6 guw (e)ever-increasing current northward. Two coils of wire lie flat s weghf: 5uudyvw( 4e-6 h)ex-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;:mpb op148ys klw1qt of wire with the north pole entering first. As the north pole enters the wire, the induced c1spbmq4wo:ly kt;18p urrent 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 angular speed about an axis whom 3l ;wz-m1l:ako, zvuse direction can be varied. In a region where a uniform magnetic fiev wm z3z:-,l;muo1ka lld 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 8mjvu86/m lhh/ku ;ca whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of thjua 86hkv8//; clm hmue 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.qrwrh ;+0;)oyw3u h ve
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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 th;a7ap3omh3)m w 0j;igrv 8 srxat 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 fiky r+u5e y*u9,ipfiv6 eld. 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 dirxwf6pf+01iot he ok)wkb-, v9ection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the po-xko6 w1o) fvk9iefht0w, p+b tential 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 rod vckcp*xa 83.tates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatobnlimg:a o j3x.sr.54bj,,pv5 z y)xm r transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotad 75oc4jezilh o*z :;stes through 60 revolutions each second. The frequency of tiz;j :7esho5c4od*l z he $emf$ 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 delr 73d8 c4t g- johkw2c6yjbc+vice 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 device thatod*cphn5 1drc ./cf jh7o j;*yb( ya,y

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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 contai/qbalj21j vf 65rla(h88 biq hns more loops than the primary coil then it is 68a1(blbfrhj8 ah qjlq5 i /v2a

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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 morn p(,f*3dzlate loops than the secondary coil then it is p 3nzd*tlf(,aa

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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 powlfw 2vy2iju5p *5:idwzr-m (her input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circu1 unsc mwa:c e.kuav;hc34 )z.it,

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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 nc lwp 5*o8;ci7bi xo*to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor i ;5inx**iwc7bol p co8s

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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 seri.ue0ox5,ke s ses to an ideal battery of constant terminal voltage. At the moment contact is ma,.sou 05eesxkde 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 resistashycms( 124 /cid(jdv9c, jzhnce 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 )0ox0ipmgf+ufbygy3gexc7 7 x : rd)1resistance 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 induct+.sq2lw gu5nf or are connected in series to a battery. The time const2f5sw l+ug .qnant for the circuit represents the 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 aj4yvaem9 eh,37rh/fu re connected in series to a battery. The battery is suddenly9aherv ,um /jyf7he43 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 have the same units e0 rnjqwx /j7utwmx-6bd(v n+*(c(kfc xcept:

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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 exl;eapf lftt 4krr do-.710/ 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 czh iz0dg 0-a(vonnected to an AC power supply. In this circuit, the currentd0z - i0(vzahg

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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 facyx,79ouiy e n, +)xajrtor when the frequency is trip rx9) euynji ax7,,+oyled?

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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 thega2e2 t3- u//hhtsis n AC voltage across an inductor is doubled, the inductive reactance of that ind// 2 is3aus2hng het-tuctor

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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 vovr(haqezj,jl9-y ebj7 2v:t6 ltage across an inductor approaches zero, the inductive rq rb j(6 jej9yvalz,-2tve h:7eactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this cir2g.pzt 7lh-2ean 09s x- xfizocuit, the curren-ps e.7 fl2zth-9oizaxnx02 g t

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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 bc8c f3aysdu14 b7z 5kzy what factor when the frequency isfa k8 d1ccz45z3by7su 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 zf;ggdt 7: v39m 3h(dlyvb0pt zero, the capacitive reactance of that capaciz: f0gm;byg v33dlp 9hv dt7(ttor

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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 capaciiz g:u-b- 5n2i+hfgcxufn63 l tor in a RLC 2uzixg 6+hun-f-i3c 5 n:fglb 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 ci,:gw x+c )hiy o:am2vorcuit 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 ao/v- 4loki f+/j0c egimpedance of the circuit increases if R increases. When is this statement teo+gvkl o4c/ fi0-j/arue?

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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.)3:g9az n qgrj)w7dpr 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-pqyvrdghmk)kk p xgd6dla -6vd22,). ;f el , 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 in an LRC series circuit 46- pf34vuh(u aahw:ikxy,fjv 9 er;y, the resonant frequency ou9pahk(ax3yr v; 6 -:jyi eh4wffv4,uf 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 reso 7 aipj,uhi-(gnance,

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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 circurs rm*o kj/q,4it occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatifwd.*vum/0y ;,qy febng in a uniform magnetic field of 0.20 T. Find the magnetic flux qvme dfb*yu0;yf, w/.through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotati* -q/ia5eepwjng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magei*/p5awqj e -netic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mk(3.8se dvanc x kcbegb q6fz:.a v;6*agnetic field of 0.20 T. Find the magnetic flux through the loop a863dax bc efqk n.*v.;s:bcegz(k v6when 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 ansln o4 .dvhu8u-j(/q kquf j64 adjustable 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 changes fr)ycffrk s35o3deepp ( 1vm 70kom $4.0 \times 10^{-5} \; Wb$ 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 tu hw128wy2 lemw9*p mzfrns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. mww21h wp e2ym*z8f9l If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area9+j)o ma ,bk5fbvyl,c - pb:nl,:sxh g 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 and9sl64ild vwu/uvm6c- iwk4e5 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 68)vle . ox)/7j yzmebc0 m flies horizontally at a location where the downward component of the Eart)78.zee jvxyloc ) m/bh'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 mtj+:w+z2bmf .o(4 ga(dnkxs s long rotates at a constant angular velocity of 2.0 rad/s ab:sdftm.k4j(2+sg b n x (+wzaoout a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 502fvs1,a1 a j:sblw :lt loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists aig44w eu v. 0w2evg* u15gmehof 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 looc9h + pqrt o-1y w.,up.vhs;vgps 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 tu1gh-p.y9 hp wvqs +;rvc.t,o he 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 x1-iz1jqu.zgy4rcp; 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 with an output of 12 glp 0 ed, kp/);+t0vnub,kvqx V maxpbv ,u lex0tqk0/) p;n v,dg+kimum 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 generator with a ma(a0x sz4 sjwl;r/a)vrj (*1d gdn zb)lzx.f1lximum $emf$ 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 6.00 W. The motor og0hcy7 lm/ epvdzsris(34x) 8perates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on mntx4vk41xxyl+whdh9- w: 7g 120 V AC, adwxl+yhk4m h1:x g9wtx4 7v n-nd 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. 37tuogkrb2)b 8cg1 rnThe operating current is 1.0 A. 27cgr) b1uot nbrk38g 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 tov9 (cyh ,cj yos: jejk5x-f(,n a 24-V power supply. The operating current is 1.0 A at full speed. Wh(e vx ,c,9o:y- kjn(fjc jhy5sat 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 internap ; jb)ge8a5pkl resistance 6.0 W is connected to a 24-V power supply. The ok apg)bjp5; 8eperating current is 1.0 A at full speed. 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 tan co ;2ji:4afc uf,:do reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow inv7jim 8wz8q, 4e dgxy/k o)s2a the secondary. How many turns are in the secondaisqo)a78 mzeg42k j vyw8 x,d/ry?

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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 u,l3 hqjg 7pg*r se17lin a 110-V primary if the 24-V secondag* ,rjusq73glhl7pe 1 ry 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-turn3typ; k 0knvf3fv)x6 n primary coil and a 2000-turn secondary coil. I 30v3f;v6)nxkf kpyntf the current 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 j+ ztzdqe; 43iof a transformer. Assuming 100% efficiency, how many amps 4;itdj q 3z+zeat 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V avc,ysfnd,99 g(up0mb n3v 4n*b0,ndi6 d uelqt 10.0 mA. The primary coinsd9 i,(u,n4l , ev 0unbdp* 9n 3mfc6b0gydqvl operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sec8lf58t e4fjkw lgt*) hghhu b5;nl6c.ondary coil. If 120 V at 2.0 A is app58 lnlf.)* tle54c6jf8g hwkhhbg;tu lied 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 cov p5(xlrkc2m17 rqv1 jil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present ir mj2qx(kp1clrv57v 1n 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 has 200 turns. Iyoz47 xn5rf v-f the input current at the primary is 100 A, we can expect-f7yvx4 5nzr o 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 turns and itsn:g tn7b v27 0p0qzlsg secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect lpnb7tg g q n7v:2z0s0the 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 2006h3hlu qg+. o*qhg wo8 turns. If the power input to the primary is 100 W, we cgo.q 3q*8hoh6lu h gw+an 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 voltage -d3 +-e dfam k,1i7li sn,xsjxis usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the sm3-7as xsl,jf xk-iddi+1en ,econdary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usua7l -* nzabse3buhpk m2ado 7u7pg6;k3 lly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentag;b s7u n 6apakolzpeg327h*-kd m7u3be 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 current at 120 V. The voltage is usua6,we2)h ;s+iborh zkkz.iz3 rlly 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 nothrzhs3+izewk 26z );,bok .ri stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gejn(g j h-2a rgnumq6w l+;;e)tnerator 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. 2gg -am t);h;nrl e+ uj6jn(wqWhat 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 resista1s7z mtwh4m7k nce of 0.60 W. A generator produces 100 V at 70 ks7 m4wth1z m7A. 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 a 6-W line at 1000 V. Hqhs 073l qdd4a 8w8nhiow much less power would be lost if the883liq4hh7 d s nd0awq 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 gener b+r:aoym+2ev 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 :yev+r+moab2 stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a curr tyf51lxq :0zuent of 5.0 A. How much energy is stored in the coil's magnetic fie0:5uyftxqzl 1ld?

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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 resis.pw y;k-w.nui4 11jedgn)ewi tor and an 18-H inductor. What is this circ .g1-nnwdi)1w kuy i 4pjee;w.uit'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 g/wvy6:it s )liwe.+wy1ji m+voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. b/yv1mj,(gq j+m3 jwy q ;8jox What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. )6vh/nn,eni7na s8* mqqj pd/ What is the resistance of the la/q mns,nj) vhnane67dip*q8/ mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. W0t0 7zsnc8f j5xkzd; vhat is the peak current througzjts;f 8 7z0xv5n dkc0h 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 ac power supaj,yc3pa phe w3 31)hsply. What is the power dissipatey33h 1 )apwseaj,ch3p d in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ihao,re 3i:h /vgu)n4a s $I = 0.80 \sin (240 t)$. 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 -0d;vt n+ijj+ffuqn /- 8g(nu p,pol uis $I = 0.80 \sin (240 t)$. 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 resisto9mg3 nk cf1di-r 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 reactanc-lbj)o ;wwy +de of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1,x1xpk *fc. qufpv/ht; ss(m .000 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 of08q) thpfxu 6a inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactaf/,. x) wzki8ky5lravxq 1 vo0nce 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 of 20 kHz isd kal*.g 2v:vm applied to itavl2:kv m *gd.?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz so) e+bky huc-d7urce?

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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 capac t-.tj-tys4 dpfq1q 1kitor 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 react29sn vh)- eknuance 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 reayaumuj l6 4ch5t-4a0actance 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 cd88ypfqtc 2kns 71-w0.010-mF capacitor be 100 W?1pwysd 7f 2kncc-8t8 q

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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 k.jw-o ,f dt.v;w1 clbHz 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 circuixait7b:(q vakg*yfy 8w )19 fnt with 12.0 W resistance, 15.0 W inductive reactanyx fwi*)a(: qk9v8na gby1f7tce, 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 resistor, 20-mH coi109ncczfey b* l, and 1.0-mF capacitor are connected in*b9ez0 1fy cnc 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-Wh5 x +ykhxy1h- resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser1y+yh x k5hx-hies?

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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 seri2mp6kxido5r o il,/ v9es with a 20-mH inductor, what is the imped2i6 prokm/9io ,x ld5vance at 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-mH inductor, what is the-9+d,j9w ssek - dis.x fvh7bh phas-9xi,+vh9b.h k 7dd ss -wfjese angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.08wj us +8o,ssq0cg em0-mF capacitor for a total impedance of 100 W at g+ujcs s0 0,ems8qo 8w1500 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 capacitanciw 1a z/7y1cddpz3 e*/ws dop,*pbg)ces is needed in series with a 100-W resistor and 15-mH coil to get a total,cg37w1 bppw*1add) zeci o/*z/sp dy 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 b zq -ee */dy7vt4l.fsin series with a 450-mH inductor at 5000 Hz for a total i / eylfe7-dq4t.bzv* smpedance 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 v(p0o (a (rdbhresistor at 1.0-MHz for a total impedance of (r(d0po bv(ah 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 246piu;do g7ys0b1n6 v fgm5x a0-mF capacitor. What is the impedance at 1ds6uap0 xgv 5 yi4mn61;fgob7000 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 10-mF capacitor at 1m0a 6fnho8 8u ww/pmj2.0 kHz for a total impeda po8/w6aw mfm2n0huj8nce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 4f ibvag4 3dn0.-hg78 xxhuzw 1.0 kHz for a phase angle ohnzbg04-.3x afu4 wd8x hvg7if $40^{\circ}$?

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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-Wxk2zb9 k10y ev resistor at 1.0 kHz for a total impedance of 42z 0kexb1 v9yk5 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 the pgsr3z3 kr)i l7c;q dxgnf47 z6hasf7rkgi 4dzl3 3nxg z6q7r)c ;se angle?

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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 Hqav ,)p 1uwnt9z if a 100-W resistor, 20-mH coil, and 1.0-9w a,p )vqut1nmF capacitor 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 capacito hc)6joharvf6jvw)/ m)3q w4yr, and a 0.350-h o 6 vayw4mcf/wr)6)hqj v)j3H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitiy19wgt)3 ah 8;shmyepsn9: v ave reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power s)w snya8gs9y31 a9; ptv:hh meource. 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, a 1a .c r6ufc;c;qv2 k2hd0-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppu r c6c;2.k hvf2acqd;ly?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistori3rec o.u+ fgk0h8.f i for a phase angle of ichg.+. e0ufkir8of3$40^{\circ}$ 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.ub 6g,i5x :yg: z;pdug0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving s6::pzy ;u dbgi g5g,xuource?

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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 re-g)algdo 1 jgwl0p:2ysistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when -ol2pgj)0ay:lg 1 wdgthe 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 a3dpf 5v/z8ut7j7i 4ilbj2i2 cgyb en3n 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 resistance of 30 W. Whatmn:dblp1 6:sc4o q;5hk6tn/ , cvkcgq is the power fapk6/;4d6: cq:qtn 5gskvc1l cnmbo,hctor?

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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 containing a 50-W resistorftfx:asko qrgkll (,7,o /4d(, a 10-mF capacitor, and a gs lo(a korq fxl(dk,:t/47,f0.45-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(bf)n8ez ks- ln j6e)r6fj(pq* b t*ex-mH coil in series?e 8)-)(pjt6fkqr 6ejx (z*ebnlb fn*s

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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 capacitor1/mqrst tg/ a9 for a resonant frequency of qts9t am/1r/g 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 in series with a 3.7-mH inductor for a resonant freqbd6 c.zo 1gqohm 7kc.a(9:ofpue7g 1zo9pqo:.bfmahd ck 6c.o( ncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be pla(tyqtkjz)f ( 0ced in series with a 30-W resistor and a 40-mH coil if the resonant fr0jftt y((zq) kequency of the circuit is to be 1000 Hz?

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