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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 m+*y btzl.zru bvrl,; p54f)nnagnetic 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 indq y)wm yaw;d-)uction 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 chh 8;lpb(cd9 u6n8 aqtgange on the induh98pbdgtn;c68u l( aqced $emf$, 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 c*ea0 tzczxta,wd qy 7v/9/6sthe magnetic field through a loop of wire produces what edts/9t 6/c7zqaa *x cw0zv,ykind 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 c5)xo1c jnev) ff38ysw2ylxr) q2 ng: loop of wire produces what kind of change on the induced y2gfr1vclnxfe )nws3oc2 jq8 )x)y:5 $emf$, 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 / c wd,ion4shejbu ,/g,)i5qab yd:i1 $emf$ 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 induced currenyh5*l0s 3up6u1 zbxjat in a conductor will be that which tends t*ubyh x p 5uz3a6js0l1o 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 i)kh1/6oi5iwsuevr u9( v sz8bar magnet is held above its center with its north pole pointing down. The stationary689zuwrs5 /vii e)huvo1 kis( magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnhwb:8u v9c;s cet is held above its center with its north pole pointing8cu b hcsw9v;: 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 tablead73t gc4f+w9q a 8zke top in a region where the magnetic field vector points straight up. The magnetic field vanishes suwftad+gec 7a43k qz98ddenly. When viewed from above, 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 levelc7xx(r7 z5:2jk i4hmv9x+ 9wxi g eawx table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the4mg9e75 v+xjawx9z( c:2xrk7hiwxx i 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 hor1m01bwb0al y xizontal table top in a region where the magnetic field points straight down. The magnetic fi0lb1bw 0mx1y aeld disappears suddenly. When viewed from 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 tablu rrqdn1ze x l7(ua7:(e and carries an ever-increasing curre(1zlq( 7 arxnu7:edru nt 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 entey1+lmon (;6 avhsft5b*bi:lyring first. As the north v ( f1m:l tlao6ybsni 5by+h;*pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an e-;+;vxd dm i;,qj gf71tostn axis whose direction can be varied. In a region whe -i,xq;1fej +t7d s;vdog;mtnre 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 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 rotated805d z rpgz/izlo .1kr at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced 5olgzz0/8dp1 . i rrzk$emf$ 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.,wuh2*d yhz -w
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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 thatsdtac pl(jvlt31 q8;* 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 field. Th9ozwowdc vp;t 1q7i+9e $emf$ 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 mov0uzuqlpurl8 +918z3yfk*l re ed northward at constant velocity through a magnetic field that points straight down. Make e0 u3l*8 u9 llqzup1y+fkrzr 8a 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 r68el.t dt bw4y/d rdkwkv 8wi9j(o7mca9 fa:2otates 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 generator transfde8m kl3;hv i+orms

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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 rev:y87nivj6iz z olutions each second. The frequency of tj7iz ni:86zvy 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 devp.gd c gz4j5s(ice 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 thatt,*)ztfdgd2* 4/rgk ko 1yahs

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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 sh9js/m x6+r g/t. :egbu iiog; v03gdthe primary coil then sv:g i.d9g6gmhb+3/xuj;e /ot gsir 0it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondamqxj+2eap 25 xgd uh72ry coil then i5 pmda uq27jxexh22 g+t 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 i t76xmnx/1+wu 4sx 0e rw7fimeie75donput

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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 circ4qpnpk44oc8 r2dia 4a-m 1yp tuit,

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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)v4lqu,q rep g: l5lu: connected in series to an ideal battery of constant terminal voltage. At the moment contact is made wit ),:qupulrlv4:eq5g lh 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 cot,un+;fyq suwq. metmg 8.;ag*dki.( nnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is t(i u;8+ t sgf nwyak;qdq,.m.mg*.eu

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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 06o, bnq:ytfjfmn.6r- t*uyz qs/qr)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 wit6lc; om d2of ii7ykg:a3gu4c /h inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batte8 9o2d :l iis(srnyy.yry. The time constant for the circuit represents the time required fld(ysiiny: 8o2rys . 9or 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 batter uk6dmi,ln3 ))gk3-jxpvcvcpe8b)4 f y. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current t m3gxpk)cdk 63-) )cbnepij,l4u f8vvo 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 thg; jrpmutb-e p;94ch(6y( b y4fmyxy - cm*u*qe 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 uhj oed k+0(:mto 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 conne6 5ev 4eijqnv:cted to an AC power supply. In this circuit, the current jve 6i45vqne:

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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 um 6 3irsl8h;lfrequency is tripledl3 8;h r6iumls?

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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 qyxj 4(5.8l n v.utajoan inductor is doubled, the inductive reactance of thatulvo xjqy5. tj8 .an(4 inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage 6 r evdc*59jxxx5h)0 *-s im loa-czvxacross an inductor approaches zero, the inductive v v5xa-o x0e *js-ixz)5xdhcr9mc* l6 reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power suppl,yx;pu4 v c*8mt;bckij*shz 8y. In this circuit, the curreicm8b8; *yhz;v xc, u *sktj4pnt

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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 -fygq0u.bg (57vv ei guk7n.f*n7yu yq :dct-changes by what factor when the frequenc7uugec t nk-(b5*7 .vyqqg 7f:i fu.ngyv-dy0y 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 capacitor ap408;+eewvwy ckywyq 1 proaches zero, the capacitive rcq wey1e y4 0wk;yvw8+eactance 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 theyc ,;2- uv:,i tufcxfv inductor and capacitor in a RLC s2;ccfi v:ft, v yux,-ueries 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 defined as-zpk/txr q :1hx:i,nw $\cos M = R/Z$, 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 circuit increase1y c;7)rpseq os if R increases. When is this sta );oer cqy71sptement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of +.24+uix qe4r2;zkqmx j oojrthe 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 k/f0,,cn :eq w;i h0awzto/akimpedance 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 dom l; 3f/z lj3v ioy)m tqhyuahz/x904,uble in an LRC series circuit, the resonant frequency of9lq;mo3mv0z y/yl xt3)h/juz h,f4a i 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 resonancezx bhm4s*o8vmlk038y,

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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 circuq07an18*vz.u)mu zxu3uo vbiahp y0;it occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetix)xj ,:qoj(/,i o( 5rml nibcgc field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneqoxgj(l/ojr5im,n c( x) :,bitic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fieldb.evyc rd2g+;ngo ;f r6s ,4e pn/s+3bzbw mi/ of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendic 2szb;+mw 6. b pgvdfno+ b n,3y;rsi4/ee/gcrular.

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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 mag+;z2g6i fbdl kxfj 5d3netic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angld2;5dbkxz+6 f3i gljfe 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 ad. 8s5rxn 26 cdkp(fcq4tzql;f justable 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 chnsb ;vcom(*b )anges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame wi60n 4xpus7igzku(v )/2u m rketh sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changnp zm)xvkg6/(ru40uke72i us es 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 -:6j 2ogudsy9wuk *2qk-rvw.6 kgxxx 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 and3csl xfy kal2y7 54w/c area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locationw5v.c3f(qm6qpj60fduo3 dc p where the downward component of the Eartjcdp u m536qdofp(w 0cq.f6v3h's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant7:q. bmo ;s57 bzhpmml5isf9r3 jf/nc angular velocity of 2.0q:z7 mc3plifn59s7mj r sohmfb;b 5/ . rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50d t ln/s6 fl0yu699jmdw 8zld4y55ysp1eox s6 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 1p 3nrg ix-;d9a:t2:sodfnk l2 00 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 rectangulhcm)+,f 0/w fswpj1f ear loops 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 rotam+jf,h1w efw f0/ )cpstion, 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 nn/tvx5u:5s xof 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 gene el f;*:w2mdclrator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of t;eml2f dlcw* :he 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 gene ( ,mm p6j8z(zu az1xkzn6gy7ei/rvm 4rator 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 have a resistaym lb*rjh nvf+vn eb ont61a(0+il;nf98 ,6kbnce 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 hhj ) 0)wxm we6prncl*3ave a resistance of 6.00 W. The motor operates on 120 V AC, anr*w 3e) pnjlwcxm 0h6)d 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 6m11pn2 3f;d*h9ggutjeo(z mu.0 W is connected to a 24-V power supply. The operating current is 1.0 A.g1 (mm*ehtz nj;3fpd2ou 19ug What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24- 3e*z( sq q8 :cw8eh4mkzaj;tl +7shg5 o1vpoaV power supply. The opera la z+e(g v7sj4m:o;epzho*ck s qah 88w1t35qting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. dmziwjb wv0 vgrdupp4. .,479The operating current is 1.0 A at full speed. Whp .j rub7dm4v.0d9pw ,gwv4i zat 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 is3 ,6jv;puh9ioehgc1n needed to 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 xs xwzg-w5;v5 to flow in the secondarygv; w 5-5zxswx. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necesll(jt,sxi1 o 7sary in a 110-V primary if the 24-V secolsj,tx(i1 l7 ondary 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 consist; z4, y03da*mbg pnd2 5viriaas of a 500-turn primary coil and a 2000-turn secondary coili 4a;0y,gvb5ad3z *n 2dpam ir. If 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 of a transformer. Assaexe.l gf2; r5uming 100% efficiency, how many amps at 24 V can flow2.;f5 laer exg 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 750q9+zznc 13qz/xripp ,(+ p kx*1eh pwa0 V at 10.0 mA. The primary coil operates on 120 V. Whatpn zx pp p hqixa,3zwqce+k r(1+*z/91 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 itd 8omygblk) 5(s secondary coil. If 120 V at 2.0 A is apgyl5m()d8kb o plied 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 1nle ypqqx6i(qu- f13coil and 300 turns on its secondary coil. nyuqq ( -xf116p3i leq If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 :1vay * 2(v9gdejpaqs turns and its secondary has 200 turns. If the input current at the primary is 100 Ag* pv1:d2qj9eaav s(y , 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 transformerjf.6y1 jf dpx.v 8v7)i qbr(u 9w5:rp- ewctjk has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volp15. je8:pfj ki9wf )cr.v(j byu- q 6x7vtrdwtage 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 tukod+g7mv .sancz/45 -p ghd:lrns. If the power in:n5g zvs/a 7codpglk4dh+m.- put to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usua 1peog7 b4cy6vvg - e:hmty/,ally stepped up to 4500 V by a transformer and transmitted av/p-,b:om4g y7tc1 yhvgee6 through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curregh;b xjabd obr6+3.3qnt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throu+ ; 33bgrhqb.6bjxaodgh a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepa yo*-7zd59fem0dh c bpb(x.mped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage hfd e(5 moc-d y7. 9pb*0zmxbapower 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 resistance of 0.60 W. A gend4uafq335 0pukirc i2erator 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. Whauud 53 ap4 3fci2ir0kqt 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 hf6bs)1pl e :ermk7fk 9slg02a total resistance of 0.60 W. A generator producelgsb1eks f) 9: 2klrm6hfp e70s 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How muc ;l:2ca smu.a+1ral n k5v7dzrh less power would be lost if the power were transmitted at 3000 V instead of at 1000rzma; r5ud2 7 v1a:+c llkna.s 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. -pzc o. gcwuh a7*by:4 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 exceedc czb:u-4gayo.*hp w7 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 of0k(9wt:e heizj 02kjt 5.0 A. How much energy is stored in the coil's kh ( e2wjjet0z:i09ktmagnetic field?

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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 inductz8nu :6vkju j/or. What is this :8zukvu6 j/n jcircuit'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 cjvy 2: 1v2qc4j+ 9jaa;fjxvsn(4 gdwaircuit 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 AC outlet. What is the peakvjnkw(t,+ qy; 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. What is the resistance yune tu4.(e*bsay3) lof the lamp?)ab e(.*nysy4e ut3u l

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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 itpw- 7t,b *+:h voq 3xevwi cnoa+b5,to a 120-V ac power supply. What is the peak currentw * ob i bh- 5n+pitvcwe+aq,3t,o7xv: through 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 sx9qv 4m(wp6d8yg5c -tfofnj( upply. What is the power dissipated in the resistor(jmxf4 vyo5q gfdn9 (-8cpw6t?

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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-jnug) li kxo-;yu2h:3 ogy -sd91lvy-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-mj92t/c 2(gfqle wxpy9wb (5s 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 isadvd: r*-(z +ogkdjdejc; z 21f b2650-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 indu b u2u2dx5iy7gctor 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 atpab e) ,xunf0.4de r)q 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-mdt s(j - oy .:veeu*a0 lr47lbs4fhj0pH coil have 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 necessary j ej0ni750:iop w-oahr7r 8gs 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 induf.- .hz 8qsosoctor when 120 V AC at a frequency of 20 kHz is applief .qoh- 8.szosd to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourceb2jrzu 45, 8rov ioms*l; hgmzv68)mc?

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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..x1anhk/ - sge7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reasvkv0 nxhh,:1gy etr1r3-l3 ectance 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 hn 58eta*mda*a a1rn7fl;j*prave 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-miu )w3om0d7qbF capacitor be 100 W?o)i0du q7wb m3

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 tpb+udk; 9+l *-mwrk hV?

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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 :h yhptqyd4h*gqk-8hgtqt, 69 s 8b+gseries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciyhg *h9q q8 hg,h6-ts q8tytg+:d4pb ktive 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 impezhf4-b ka0*d l0fje5zq)n .prdance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitnq 0zd*r-pf j.k4zb)l5ea 0fhor 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. :wq,od4 m8job0-mF capacitor are connected i od4:ojmq,8b wn 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 s(ufl2u64 j urpdb;er1 6cj-c leries with a 20-mH inductor, what is the impedanclurb6 j;4u cru(l1jd26ef-p c e 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, whatuje h4dlysb .z)b0-*8hk ytu/ is the phase angle a 0u4 yhbu-)el8y/bj.h d t*szkt 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 24vxj5wn20(dza8hb rpm/ 8b uk 0-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1u 5njmvkbb ha4p0 (x8zw8/r d2500 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 neerp3 g7cm v6h;cded in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 27h; v3cg6 pcrm000 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 ser ,w3frgyq3n mlo ;;0oaies with a 450-mH inductor at 5000 Hz for a total impedance 3m 0a;nl yrgo3f;o,qwof 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 sdhk;0g;txk:n 2x * w5)olzmst.a.l wm eries with a 100-kW resistor at 1.0-MHz for a total impedance of 150mm )k*kwald . ;:w0hxt;.loz2n5g sxt 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 g)r( o (lrvf+jcapacitor. What is the imped)rlf+ro(j ( gvance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for aa9j.)g pmpbauz.1z;c total impedance of 41pm;p.. z9gz u )abcja5 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 wit *dvsnd.to82lxlpt29 h a 10-mF capacitor at 1.0 kHz for a phase angle89xt*t l v.2ndsd p2lo of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for l0k/r. seox,qh7.km sa total impedance of 45 W?.r/sklxekm oh,q7. 0s

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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 ;,gtgpuragec*q v 124120 Hz. What is the phase anrqv,g;2c *1ep4 t augggle?

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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, 0vg2)0si /7m ;cg hzzcb vhd-c1 dwud,20-mH coil, and 1.0d7bd 2h/cvm10 vizdz-s h,)g0c uw ;gc-mF 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 capagnjiim/ kj b .:t6a i)9kv3nt6citor, and a 0.350-H inductor. The circuit is connected to a 120-V, 606bmiakit ik:n .3g9 6jnj tv/)-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 capac;u1 nwk2e8. q ajpijtugbs3 87itive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Whnj7kgi;q8sp u u3eb.2t 8j1waat 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 RLa 8qw9uqznu;13wdzs 3 C circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6nu 19sqw 33 8zzqwu;ad0-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 4ukc9fb ;aim5,8zw mbin series with a 500-W resistor for a phase angle of 8w5mufb;m,z b4caki 9 $40^{\circ}$ 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 =ir)+*uds; ro/j3hd rfp ) y0ti vx9vw+ 10.0 mF. At what frequency s3orr)d +iytp )r0h;i/+s jwdx9*vvu fhould the circuit 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 outpuva,g5j d)un8gg s4x+ ha3yc;p t in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactaj,5gh8;vg cd uns )+a34xg ypance, 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 andp(w imnuvpj n l0pz-/0 o43wm4(u fv- 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 circuit1ei: ,qss/qw9hqg*fqsh7 -vj has an impedance of 60 W and a resistance of 30 W. What is the power factw9f*,q-hqgqv 1 eh:sjs/isq7or?

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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 f5nn)i18x5 vdolinbifxc18j 4 m/2iyfor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplv8 o f2f5)ix1j4i8ndi/ xbyn1il 5ncmy?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in serhswzik98p ,w .ies?k8.h,wzw9 psi

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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 4wj/ /aawlx:q0.7-mF capacitor for a resonant frequqjl/ w :0wa/axency of 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 wiqfp rzpa+x5 ir79jq q68 vkd4/th a 3.7-mH inductor for a resonant frequency of 1008qa 4/76fpx r dqkj5 9+vqzrip0 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 resif5f*.,5yw k3ya vw g vk8tb c+ta,7cyjstor and a 40-mH coil if the resonant frequency oftg,vvjfb8ty7,w wf*y + 3ak 5 y5cac.k the circuit is to be 1000 Hz?

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