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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 oy*yxy o /u(ka krn):fh7;drj+f 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 indgx4l.np6(xml8 l0dr5 ja n+kiuction 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 5r/c xo:7 ba.b8 ndx*xbf3nak loops of wire in a coil produces what kind of change on the inducedxko/7d b*5:8ax3nb n a br.xcf $emf$, 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 magnetiy)*:el)e a vajc field through a loop of wire produces what kind of chan))lajye*v: ea ge 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 kind t/ l/:v.l mpsfof change on the inducpmsf/ t:v .l/led $emf$, 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 frtje/9* 3ixgqn om a magnetic 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 lawpeb*d05 gx kua2w 6t1n, the direction of an induced current in a conductor will be that which tends to produce which of the foll5 ub0ex16dp*w2gkna t owing 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 tablee *n. soswip/9. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from se9 no*i.p sw/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 heli a9,2g0fr oxod above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed f9ora fx,i20og rom 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 vector /u m.i4w+ drhzcjc:qborg8:: points straight up. The magnetic field vanishes suddenly. When viewed from above, what is thz+dcg:r /i. buh qwcm: j:or84e 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 magnet.h4hyg:+ncb zc qhh0)ic field vector points zchng 4.q +b:yhch 0h)straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tae 44m5 awl8ghoble top in a region where the magnetic field points straighl4oagme 4w8h5t down. The magnetic field 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 lie+ do.2b*xawyhe6 l-rus on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of tho +y. ex l*h2ub6rwad-e 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 wi7)fczquxol8o tv )t34 el.*rith the north pole entering first. As the north pole enters the wire, the induced cllx).fi7e u *qot) z84ocv rt3urrent 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 1s1urw;ua *rxv plo 1zye)f4,is rotated 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 orienf;o11,s yrra *w 1) xluepuzv4tation 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 abe8vn/:j2ijl4ka xchhwwm :m-56: 2fx-tnkpqout an axis whose direction can be varied. In a region where a uniform mhnvm: e:8pf-njx 4w i:xackqm kjt2 w6 l-5h/2agnetic 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.:4a rxn9 jp(w- 8gs vrbj9zk9v
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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 45 +oc)3vdxraj (hla lwx ad;.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 magne v,unx,6eyk/ y* 6ips:p y8frmtic field. 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 (or8/lg+o9qi hyrtl)/ txiented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning 8 xqg9o y/litr+ l/)ththe 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 rot hp+x il6to:sy .f otkt h9pe:+np3:w6ates 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 tr;7by vmv)+iwsj0 u7kransforms

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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 seco geqospry rr;1w) -r76nd. The frequency of trg)7 yr1w- 6r sqpoer;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 devi:703q k.g yo(wlarlr4to) koz ce 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 dt72xi+hjjep e vp/(,x evice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops thcmljw( ,k*wom mxf,+a z+oz0d3gjjvgdz 6/+0an the primary coil then it is ,o wzg,0w ax6ld+jk0 (*o+mmjdg+j/zfzcmv 3a

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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 conta4sy dg3em c*z8o)ub 83a* vw zwppcno:wda3*6ins more loops than the secondary coil then it isucp e*w:gz*8*ozabs8c 33a v6wywo pd3)mdn 4 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, th /9jj f.(skiq4vx ak)ke power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant svz9d,yss ;)7*npy mq 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 ideal battery ofm(bbwr2c 3:sxvd x w5/ constant termindrxm/sw b:3 (wc5b2vxal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an induc fmha6, s:;+suw9w aqctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with t; mu+ 9aha:cw, wsfq6she 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 o16akgixk4.wlnb.mt hc a2/9 connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conne;pty03is -e, aol) j/ scgnnm.a89 8bwvu6cb ncted 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 battery. The9:zm(p 1:8fl fh pqffo time constant for the circuit represents the time required for the curren1:fo8qlhf(9: zp mffpt 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 cn6 61lhw- wfrfonnected in series to a battery. The battery is suddenly remove1fw6nhf r6 lw-d 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 the6; l4n+ii rwp mocj. )q9g*kfb 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 su4j8 4 c;ujou oz:b*oyhpply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC powe/ydk8y-ml.m, a vx+3jizi d5 ir supply. In this circuit, the curren .da/i85i3vzjlmkimy,+xd- yt

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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 cir3ok3.5x; k z q3narrzt)alrrfas5f m.iv. 8p8cuit changes by what factor when the frequency is tk)a.3 83zt .xf r58;fpslirrm3z5aro.qnv ak ripled?

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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 aiztph l 812yx)n inductor is doubled, the inductive reactance of that indu2y ixt8h1l)pzctor

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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 a2u2 z) u38nvpr z2davnn inductor approaches zero, the inductive reacta2v8 durp2 zuvn)a 2n3znce 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 s cpwb gl.e6s *9y.1zia y6(itgy0z5usupply. In this circuit, the currealzc e.i g16y0(yssyzb9 *6wg pu .it5nt

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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 acevb+2 cx5qx i+v *orphi)s0shi4 xl1i))o g0 x circuit changes by what factor when the frequency is s gxvi)+ o*sic0i+ )hv0e45xpixo1xhqb 2l)rtripled?

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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 capacito6c2) yyjwhrwqd 3 a+3,mdzne-;/ fyz 5t uhz7er approaches zero, the capacitive reactance of thndz3 z; -5fyuy7edr)6a,we/thhwz y c2j+3m qat 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 wu/r(qd2fkjno s6 hoeu 404a: the inductor and capacitor in a RLC sku(0eo h62n /qajofu4r4:w dseries 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 defi4 lnmm,6j ijm,ned 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 circui 0a-5p kp.dtbz/d,tl ot. The impedance of the circuit increases if R increases. When is this statement/z pt t0,.lp-d doabk5 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 imped. h3h* zd r5:bmlz wlpjf;99lxance 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 ci/940nw9, g jjunxwqtcq2f,x v rcuit 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 phpznl *j-r 54jbgecfa)j/ .; LRC series circuit, the resonant frequency of that circuit pn l-f/j )5 bjh4.pjer c*;gazwill

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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 Ajo8gxjaeb* a x:-.0 wsC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occutp +ibxd fslr50/ule5i 6n uh; sb4a75rs 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 p 6vo+k5vzbagn 0mmo 4)y4h+n 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 magnetic fieno 4ph+)0zmk5 +6mga von4vyb ld 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: / 972pitzdq)fhoy(upi( wuwnmzq7. 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 zuh(dfu .nqp (iy9i )mw2w:qp7zt /o7loop 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 rotating in a t258 6i xo hgiohr*+xiuniform magnetic field of 0.20 T. Find the magnetic flux through the loop when 5i x+6h*iio28rh xotg 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 adj9qso w3gu92e u bl8ui x**8vzrustable 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 4n;+i 0: pehxnu 0x2squan v9qchanges 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 tuufkpx*397 xjz rns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane ofz7xpx9 3kj u*f 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 turns and an areie 126i vuwqj2a 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 x zy)odc.;ct9 and 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 5kx4oac ;41y grdc0kkksg/) vlocation where the downward component of the Earth's magneti4d gk k vx0gcrycs54/ok1); kac 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 coqq/i s4nn .om8q)vg r4nstant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constanq4mnv 8. o 4/gnqs)irqt 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-seyl j 7j) *lhx1cwy ijt*;yi*2kcz+9iuctional 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 100 turns oj1of5g zoik(4 7asax+f wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 120b( okf c a1tv9d7c e+o6nvef. cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the lon1 k 6ond0va 7c+e9cvot.ebff(g side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output 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 ofn ,x7+mmn81obx xjmw2fd bt6 bpk8 )6k 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 oleqtm 3*0 tvri)q) 0wn*xyqw ,utput of 12 V maximum when rotated at qrxy)0, ql*t0vqwew min*) 3 t60 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 maw2i 5yt2m*ywdkun7 c vgz)+ g;ximum $emf$ 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 lk upkb458da sdt-4:tof 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operateea7w d+de /lh*s on 120 V AC, a+deh 7lw*d ae/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. a*ko/ 0 36kljlgb.dqgThe opek*./qo3g0bj6dagll krating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-)p 9k;+ gp(e0bufkzy8fvc x jv :,n:jdV power supply. The operating current is 1.0 A at full speed. Wha +b9:zvkyk ,8f(ep dv)j0gxc;np:ufj t 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 . pmzrdey 90)z1zz v)csupply. The operating current0 zrpdy)zv.19mz e)zc 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 to reduce a prim29,k-cmhbtjko / s 1rtary 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 in the stb dd2u8r (wgw 5ojx fn -tvey1k:07x,econdary. How many turns are in the secondfdxret 071(unxw8tk5j: wdg vbo,-y2ary?

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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 primary if h7y**rr: sdtjkgqr,q k.5;a e the 24-V secondary has 100 turnshdk qsktqaeg.r y:*7,r; jr*5?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil azy 2utq4r7 7ez9 xcs:mpf88apnd a 2000-turn secondary coil. If the curr2eszq98faxzpr 7t:8u y m7 pc4ent 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. As yx,ag+u .uv)gsuming 100% efficiency, how many amps xgvuay.u,+g) at 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 73op1 p,c ;ibzph xkxaeikz6(yd 86- 4v500 V at 10.0 mA. The p-1; kxzvo4x c6aip ebpk y6z(,ip 3hd8rimary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary ru xm6bs nu(,qo o-.6vcoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary6o (os6m,vub-nux rq., what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its s:(p(5 cevcm buecondary coil. Ifb5: vc(u(e pmc 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 turns and its saz9bjwld3ml1 /.p .0k.(qxwcoz l* zkecondary has 200 turns. If the ijkpxwkzdo9ll .am13./*qlw z0 ( bzc.nput 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 hv mjr-/5q-+fihmc;n wn3 k9kfas 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary j9+m wn;v ih-f /kcq3mrk5fn -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 transforrnxot2f+l.4 9u,pg6 ump e t:emer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary t29n:rue,pu.e ml otgtp 6 f4+xo 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 Aj wi (4+upnsvb57l55e29k eeobyr u9 t of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a pl+n97u by5p v j9(t2be5ie4sre k5wouower line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppeda8f3u5 e ),tpw*hpxtz:rh b;x+pzce(ye2 +il up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage uf 5l yxp,xt8er:w(3+ zb*eph)it eazh+p 2 ;cpower 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 voltagez*ky .64vd3w v+,dzg3 up kwbh is usually stepped up to 4500 V by a transformer and transmitted through a power lu 4hwzwkpbvd.,* z6 d3 +3gvykine of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission m+khz)/c0p bb line 50 km long has a total resistance of 0.60 W. A generator produces 100 V at b/zbh+p 0mck)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 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 totalj -c.mmh; 13qd 3nudmk resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a tranm d-mk 1jnqm3.3cd;hu sformer 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 m90 p+9cvx miv vvugt9/uch less power would be lost if the power were transmitted at 3000 V instead of at vmx9+ivc u/g v9v09pt1000 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 ll f9b 19)rl8mhty, ex20 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 etm91,yl rh 9l)lbxf8in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. . t z8agfnt1zru6b0 l+ How much energy is stored in the coil's magnetic fieb 6 tu.081nazg t+rlzfld?

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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 1m-, : t:;cci*xbfcecm 8-H inductor. What is this circuit cb::, ccix*ecmmtf;- '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 d7 e*hb 7+huias78 osxthe 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-e.b + xct;h fxe4;,biwV 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 *mgsoz: hx q rnibh(8 w/5ih0/AC outlet. What is the resistance of the lamw8hri q zm*hbi /:x0n/h5(gsop?

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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 po,.7eb/kivg3lj n9rims1 bg x(wer supply. What is the peak current through the resbs iev1(rbgk.m,/ x nj7i93 glistor?

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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-V5s ortq-o )rgp 4m(.jv ac power supply. What is the power dissipated ip-4v( tqsjoro. 5) mgrn 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 re gf:dd)q8sx 2a6) l9tx5vripe cnwu+6sistor 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- ,jab 5tjkozh0(405bfgoh)81ony ym vW 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 50-W resis4.wx9,fyhhc bnug 4xr 7go2.d tor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 y8oyj6. :jbdrHz?

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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 100,usa. .pv wz4v0 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-mHs9;z0h:vr vtdc emw ew1l 3)8cqi;rm) 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 for 157 W of ind8j.; w:mbj ksxuctive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 1.cj+v(zde *m/ wlelp ,20 V AC at a frequency of 20 kHz is e/jp,(* vzdclewm.+ l applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 4bexawhq h.b;bsow,(kccd/l8y *6 7z Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-md16owbpc ,rdb4x ;bmfyxci2*dd 7iff/; z u2(F 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 cazmme k2llxb4n ds34t 5 218yffpacitive 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 + rumspbgq3i44g lm3 cwu:-q,10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will thxqzl jg8 -olw):hgr3 *e capacitive reactance of a 0.010-mF capacitor be 100 W8l )jh-ogq l:x*g3wz r?

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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 V? zbjd0 ya/. +bzmnjt5.tp ff*fm+a 9n7

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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 ssw(kc+:t dbzu :+l);ydc ft +weries circuit with 12.0 W resistance, 15.0 W inductive reactance, fw(yb) d+cz;cwl+ tt+:sdku :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 res;d* q5umbj)bpd 4pl.oistor, 20-mH coil, and 1.0-mF capacitor areb*d qd5p 4mu)olb.; pj 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 150 (xt0q-1qk xgk0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cap-qx0kxq t g(1kacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is co y3 2+g*tv4avqdxlan),*yhqi nnected in series with a 20-mH inductor, what is the impedance at 10n + aiqhlg* t)a4y*y32dq,vvx00 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 jza*(i29w x-urqxed +a 20-mH inductor, what is the phase angle at 10udeijw r(2*9a+qxz x-00 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 1ot vk)9y,7vzrz h qfza.s,i07.0-mF capacitor for ri,zyz).70a z97ovf,thsq v ka total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in serie7):oif8trg nes with a 100-W resistor and 15-mH coil to get a total impedance of 1e r):7gofti 8n10 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 H n27se 8 po0xttshh-8nz for a total impedance of 40000 xss-87ph28e htn0 not 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 seriest8 vy+r5eyz*t with a 100-kW resistor at 1.0-MHz for a total y5r t+evzt8y* impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What y(pevu m5d d 95tybnj5m gr081is the impedanc9m 1mne ypbt5ru8g 0(5dyj vd5e 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-m5,r4wg dr0yr ie4n8ts;pv uo1,ae8faF capacitor at 1.0 kHz for a total 1fe,u;tov,48w0d 8i4ey rgnar5ps ar impedance 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 p o/jkef 6z-p8in series with a 10-mF capacitor at 1.0 kHz for a phase angle o8 ep /6jfzp-okf $40^{\circ}$?

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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 seriuev0(s y dc0*7 gy(zhses with a 30-W resistor at 1.0 kHz for a total impedahe yusv7(zs dc*(0gy 0nce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at yglhmr - laipkt2vp/) 8y y.09120 Hz. What is the phase atl )l2/.yr-k8gv0pypyi h9a mngle?

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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 8o4 /bkcyui;5ph 6ya iresistor, 20-mH coil, and 1.0-mF capacitor aickyuiyp 4o b5;h/ a68re 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 105+ fa9ved+ ucj.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz u9vd+fe+ c5j apower 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 capacitive reactance 30 W, a(xh:1;3dkhew 3joyaug : pn.ond an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz p ho kwj1(d3ynhge:uo.3:pxa; ower 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 serv2/dg6-y;8mfynz5/u mf .ylhq /y gfries RLC circuit containing a 50-W resistor, a 10-mF capacitor,fgyf6rl/y;mn -yv 2fh/q 5 m/zyu.8dg and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor forcon:jjdchl; gd648d; a phase angle onglh8d c4cjd :o6d;j ;f $40^{\circ}$ 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 5 g w(ced-x-mgwz(.lfotz(u+;fm m.i4 dq; jw= 10.0 mF. At what frequency should the circuit be driven in order to have ma c. z.u ifmw-d(ldq;ft;-gwje5owx4m (+ mgz( ximum 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 resistance, s.xrh.7 8 0jzieuz5xv15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit i85ir0zezxj .hvxu .7s s connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit i dptp/d::1i aes $63^{\circ}$. 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. 1e+bbn 9 xcegd-8kt3yp /kd+ pWhat is the ++exybk9bp3cntepd k1 - 8d/gpower factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC 7es rivy(9pru 86nof+ circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz v +pi y8re(nr76f9uos 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) bbnse/v3qtn* .io(a 15-mH coil in series? tnn ()esv qb3o/bia*.

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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 z: e1vw-9qts7e zaro3capacitor for a resonant frequency of 10 1 arz7sqe vzo3et-w: 9kHz?

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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 serievai fz4( cui 6c+j )qc/quo0o2s with a 3.7-mH inductor for a resonant frequvo) (qi6j/c +co 2uczqiu a4f0ency 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 placed in series with a 30-W resistor qy9iub/(:d,3n qw fn5n-v jp+q rl(up8,zbevand a 40-mH coil if the resonant frequency of the circuit is to be 10 ,qzqu3njnw :f/ 9-pv+nd(i rl p85e,bbu vyq(00 Hz?

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