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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: 游客未登录  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 unh1*o egepw 43pits of 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 induction statesx jo5twq -qfmw. g)(e2 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 wirwy z rg9yv1bd17ccc*9e in a coil produces what kind of change on the inducedc yr*9cw g7vcb11dz9y $emf$, 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 thatpk7n me1 i4e xf7,:drough a loop of wire produces what kmk7 a7t41np:eiexd,f ind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wf7 ,go+ i1l lw /,9tk(zt2tygnb jg0yeire produces what kind of change on the induceg w,,gyb7 e flo(/igntytj9z+21 k0l td $emf$, 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 fieln 2l8qwlsn sb)z2sr 6fava025 d 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 sqr t8cc7 x 8d*2oe:gk7+cudu :5frwdan induced current in a conductor will be that5r7qg7c:e u+dr*8tkc d:8s wxd ufoc2 which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnetojw0;kg)2.bz j nsfl mz1 o(v1 is held above its center with its north pole pointing down. The stationary maglb1g0onjs;f)m2.o wjv z1 ( zknet 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 magnet isvocd+avxxe3 fyh ,r +3 wp:z57 held above its center with its north pole pointing down, and released7w z5cfoeav3xvdx3+p:yr h ,+ . 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 tabj1:c qt vwqx0xg9pc//s jh*xdy/,j +ile top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above,+sp*/vixcjgx j ,9/ 1jcyh /:qxtw0q d what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a regioc+f/x/4ezj n8lvp(fs n where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viefnc v48/jp ze(/+f slxwed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top g2caxn 28tm)3qgda)o in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field di)gn2 gqx c8o)2 3tmaadsappears?

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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 i6k;r x5ydmq n yv:*9eon a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced cvi96*eqn;dm5 k yx:ry urrent 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+qpah v l4j d;:gx+p1a a loop of wire with the north pole entering first. As the nog4xd + 1vlqpj+aa :;hprth 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 con/uddxk *ard/ (x d3 shi6 o3u5ck2x+mlstant 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 i u(d2 5dhx*3d63csxlu kmaxik r/+o/df 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 wm0ifaaeg/) ) qhose direction can be varied. In a region where aqai)gf e)0ma/ uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.lf-y6-av9sx t ah7s) kpz;ea8
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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 aenme1 -c6 t s/psr6qu3n $emf$ 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 bzv2u7zq :5pxba qyk69ggndqo (: -- +f:gi cpa magnetic 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 (oriented in the eastn*e h3id1ni,j :ni-3zu) yknd-west direction) is moved northward at constant velocity through a magnetic field that points straight dd n*n3d-i :)iij 3,huez nkny1own. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant azc1wqv2+kx 3m f9-/fv sei*cdngular 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 transfor2mk lsus10s3i ms

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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 revolutioco 4 h um qd3ezv.2: vwz,fu(t:qi aajf2932aons each second. The frequency of th fazu3,4h u 2q(q.2 m3vdi:jatzofe:aw2v9c oe $emf$ 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 dev9kj/j;ny ydcf ;,mo n3ice 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 th m7zp- xqek-t...ixf lat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the pr l5v0ntus b fb25+mf+rimary coil theb5l n+ f+ 5fs02rbtuvmn it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops twn a6e,vr,h7o ug x)/fy;j 2eehan the secondary coilv7y) g r,xfe;nj,h/ee2uaow6 then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpuuk+ x+glb5:m ;nvaqat h7 *t)ot

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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 circu *akhs wktdk0m/ ;8o9pit,

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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 saxdehvh ;7lp /t )p/ux-+g5 yderies to an ideal battery of constant terminal voltage. At the moment contact is made with thp-dahxxy/pv5+7;t/)eu d g lhe 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 tkm ba.c 7-ab6are connected in series to an ideal battery of constant terminal voltage. At t 7m tc-6bkb.aahe moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L 6xt7txk:ln xta v4o)+ and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to anl jxlz7)s fns)33cr7i $emf$. 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. Thuzf)z39 1 azpger/x,pe time constant for the circuit represents the time required f)f9zzp3ue x1/zp g ,aror 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 toz xe tz;bgvp aw4r.p) /6ac8/e a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cur eac6 wz/4 vgz)p.b; 8paext/rrent 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 sa2kggwgpjc)f hgb +wym;wc 8h,( 71vq5me units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuitij a2hxd- w-r3, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, tj qewl f/x r-x60z.a(phe current.xrz/lfa( p 0 xewj6q-

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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 fr3nmxrex0d 2a zkfaqe0u-6x1( equency is txfk2xur nzqa ee3d(0a1- m06xripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the in+ xf70(pqjx bnductive reactan0jpxqb7f+ xn(ce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an bn/pl99v o2qp inductor approaches zero, the inductive reactvpnqo29 /b9l pance 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 conw,b:43,ku i ei6+ttr m4 fidzh,tx ki8nected to an AC power supply. In this circuit, the curren:tf6m4xr zkti8wi,i ehb4+d,u3it,kt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when thcl0btwnp ,5je,cxi 09e frequency is triplj0xtclp5ic ,e 9 w0,nbed?

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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 appr/mwq)h nb 2z:,ap0mhooaches zero, the capacitive reacnph0qhm z amb)w/2:,o tance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the in pe :8q* gso+w9zq*vopductor and capacitor in a wv8pq e*o:*9+g qpozsRLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit v2levy/m8 5r:b tfo+mis 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 impedv8ax m8wi)2sryq ln6 mrv-ac19 b.7odance of the circuit increases if R increases. When is this statemexv8n-yr w qidlv9 26oam m7.asb18)rcnt 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 theu: 171p gqi1zb/ivnavdol-m) 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 circ(d,gvxgag-vsf h 8m; eq-4vm3uit 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 capib5 l ixdrxdo,xx4l9+6lw 46 aacitance both double in an LRC series circuit, the resonant frequency of tha5 lbx49xd xi,r+o6x wdlli64at 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 3 nvszl5j,ii- by an AC 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 circ jov5 0l+jdsrc33v* pauit 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 bm-xb0+x k+pt uniform magnetic field of 0.20 T. Find the magnetic flux throu0k+x+xbbm -ptgh 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 rot cwhmeq.6 vr;mez5yk h2:8 zt:ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the r c h26z8. kt:mvmq ;z5eewyh:loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mg+0aqdubkg)qlgbf3rbg -1 8 0agnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop a0 gbd)q-lu gra g0 13qb8+gfkbnd 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 aop n d8r(/ tmxdg60j7a, zbnz7rea of an 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 fra ..wwx1z+4u6hm:2ipzjw whd om $4.0 \times 10^{-5} \; Wb$ 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 ofkzsp/8hzhra36wz7)8ln x d k7 wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s,wlhknaz7k/z8 xh3srdz) 8p67 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 turnscunu 53362sibbf c5ykbnnq b 19mr0j 4 and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns kwb2axi2(5p nx9n c9sand 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 location where thhrlbj qh.a(z)6jgl+ r(ny l1;e downward component of the Earth's magnetic field +l zr1hj(g h;rbnqlyja (.l6)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 aty9h8eq5 w,qpo a constant angular velocity5poyh w,98qq e of 2.0 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 50 loops and a cross-section v( 0uy,dfmleey9 jvhc--9 -sial 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 consioqt(6 x97 hgnfx/m )fjsts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Eavtp,4 wzc7mp8ch 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 the mz4wtcpp v7 8m,aximum 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 tr(w* n w yodx23crx0yj2c;g8furns 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 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 constru -dcn, uz4nq8kct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T qkn8uz-,4 cdnis 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 genera y0twc8-i i (0kqg*ooqtor 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 mnpde-y;ayh4 pn(-n)8xj m b:d otor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates y5*m4hgcou :oon 120 V:yu*m o4oc5hg AC, and 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 resistgn oq6a5)fdw il,ue0(yf. /aeance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is6u,(/) y oelnqdgfi f.a5w ae0 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-h9 2ftupb+y27 cwy4rd V power supply. The operating current is 1.0 A2 b2 r94cfy tdphwy+u7 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 c/1(wc hknp1r ttp 39q 9tbic6uonnected to a 24-V power supply. The operati1nqth ( 6rptuw kb9c9c /pit31ng 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 to reduce a primary volt ldc0f r.b9p:yage 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 transfca 4b(pgu* wc g2;2vfr:mc6vpormer causes 14 A to flow in the secondary. How many turns are cv(agg6cv2u 42 mpb:rpf w* ;cin 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 necessary in 2bab9hh*q)9 esi/:u7 yyt bx61 iv ufra 110-V primary if the 24-V sech:x f6e2rt a1/yb7b9 ysi9u h)bq i*vuondary 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-turn primary coil and a 2000ex);9t ndk*s8gp z bh6-turn secondary coil. If the cur6; *kdbpnt8gh zs)e9xrent 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 w4.ci 2hcd0uu primary of a transformer. Assuming 100% efficiency, how many amps .42dc u0hwuci 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 7500 9tf vhn n+;/,vlnr q8 ot1rf0pV at 10.0 mA. The primary coil operates on 120 V. What doe tq8vnvh/l9; 1n0 rfnpo tf,r+s 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 sed l xkh7o;yn*8condary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in k7 8*hld;xoyn 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 1t ssv9 3d3npxturns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curre 3n ps3t91dxsvnt is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary zriqb(p+48 t 8-v dgowhas 200 turns. If the input current at the primary is 100 A, we can expect the output cw(dqr4 + 88obzi-vgtpurrent 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 5 bv:8m4xa wzhturns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can exx8a4zm5b:h vwpect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformermyrx*- *foodywl /b :* 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 to be (neglecting frictional lossesdxl-f m*yo *o:*w yb/r)

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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 us,yj)d0bglnyg3-;ynd t pzb d:-eh : f1ually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number bhtg3n: d,d;y0)-z ydbjply:ef1g n-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 n5(qx )7i1 ;dh.gl cnt7if c8nfegy/oat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage p o(gi7n;.le51 fnh /gc ifx8ct7qn) ydower 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 ste1 f5 ynv y/tq)va/gfv(pl )3-2qrjr bipped up to 4500 V by )23 f/btyv(p/r-) qv ailrv5nfq 1 gyja transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. ;0e0wevyd yq:s 7q: scA generator producese:e vw; 0qssq7dcy:0y 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 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 lonu+ ukct- m;r9gg has a total 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 transformer with a turns ratio k-r;+mut g9uc 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 6c hq;ojm/h6wve5 *d2q*d bc+s ,wetf 5-W line at 1000 V. How much less power would be lost if the power were transmitte6*;qc,vs5b he omtwe qc2dh5 f*d+/jwd at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V a1: fp s*agmsh0t 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the*:as1hgs0mp f power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in then9aj d399e q *j xijim07hp+hc5bi)ah coil's maj9*ad7)5 h bqhi9+ m9ixp3ia jh c0nejgnetic 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 and9e5 ml).wjbklw qf(jm))usmw,.jq4r an 18-H inductor. What is this circuit's tjmul)q,9 )r .f4kbjw)e w.wsm5(j lmqime 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 wherfw il/-x dejov m;:jz ,;a 9y4li/y/rxnxbs+,e 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 ix glc-bg )--.rgrypz zg3p9m 3s 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. Wy-gvsl 7xvp* ,xx/n 2dhat is the resistance of the lamp,x7* l-xpng/yvxs2 vd ?

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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. Wh,aklbvqk21b:zw5 *hjv i g3z.at is the peak current through the resisv,h . bg1b3wv5 ik:aj*k q2zlztor?

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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 supply. What is 8py56-,vih xeuht8gd the power dissx8-6ehh,i8uy d t 5vpgipated 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 rem: ;m/x30vsbkfz9 on/,8b,wlmc izqb sistor 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(.l m4 so:mpruq un9 /cm-a,vj-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 50-W resistor is z-1ctf-o my5 r$I = 0.80 \sin (240 t)$. 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 yee6pa 6m7a3m60 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 reactanc7tw *up)m :e4ozep xqbyro0;: e of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactanceso+p(p /s(z( zsm(tpa?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necesezaz4lwhxh4 j 1v 53g o1kb3s3sary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency4 8ew jra39lqy of 20 kHz is appliq j8arwe 43yl9ed 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 s/;:.ej8cgf* vgywm giource?

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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-my/) l)i3biy0: vn,vey :rql-skwo0zmF 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 reactan:bd(9xg)vilu1fdrxug q5d +wi 8g q/us--pd ; ce 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 hav 1m .wh u6i2lxof+tvsir8* p2ue 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 reacta6 99m;;.xnaao(yb ,cpellhukxeb 2g0nce of a 0.010-mF capacitor be 100 W?u6oe cx;x(.,a 0yh9 9la kl;gpb2mb ne

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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 ank3xa lg/2;s ,2nggz9d gipn)f d 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistan)+bh( u;sz rimo*ms*x 2u) fbmce, 15.0 W indbfmm()xbs*o iuu2sm rz;*) h+uctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-v z: +/5ydaox:k2zzq jmH coil, and 1.0-mF capacitor are connected in series?zzqy z daxj/:kv 2+o:5

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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 resistorijqd50,s4k ygy ls+ e2, 20-mH coil, and 1.0-mF capacitor are connected in serieskgqiy 05dyle2,j + ss4?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mpssf;8slif 6r3t :l t eam1(p5H inductor, what is the impedppis8 tmle r5ff l;t:( s3a16sance 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 e y,e1 3xi(hbt0zacz)the phase aybe,1iz h()0c ezx3tangle 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 circgvi.th7y2i lpuiy 13.oe(x ,quit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 1 xelqi7v2(, i1u.y3i gtp.hyo00 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 series withi 27rjk z3ywosay7y;9 a 100-W resistor and 15-mH coil to get a t a 7r ;s3jzywyoki7y29otal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in servk p)h2w y+c+n)a2 pojq50rzjies with a 450-mH inductor at 5000 Hz for a total impedance of+5) a2j phk rnq0zojpw2cy)+v 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 o fspg 10i8t1 3fnoejy6+hf.hresistor at 1.0-MHz for a totae fihft .p81nghj f+os60 yo13l 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 is the q tax),*) cs(tr6b-1ob rthsfimpedance at 1xbts, ()*qor rhc ft-a )st6b1000 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 nee6)8obv.vj zk/era h*fded in series with a 10-mF capacitor at 1.0 kHz for a total impedancekr b6vo)z.vfh *j8/e a 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 wi3qu/ y6o qp uny08sp4kxtg j k/,6s7mlth a 10-mF capacitor at 1.0 kHz for a phase goyu36 m 7pkq0tnl/ qu4p6sskj 8 /,yxangle 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 resin+;h6-kinc as stor at 1.0 kHz for a total impedance of 45 W;nh k+cni6 -as?

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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 ix uia;u 5-jzlb*hhu ,g*tc f5+n series with a 100-mF capacitor at 120 Hz. What is the phacgi xha+jl ;-uh* 5t5*ufzbu,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 Hz if a 100-W resistor, 207ebk-u d+veu; -mH coil, and 1.0-mF capacitor are connected inb-u ke+ vud;7e 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 consi2iqoudww/ pb .66yv b7sts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connecty6obqw /7ib 6w2du.vp ed 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 puo8e sv4o)m:of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60v 4)8pumoos:e-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC cif6cr,v c.1dy4 x f-e,p8kgjigrcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.i 4cgjfgyc.v1fx8r d-p6ek, ,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 ne; vai1bjdwh, 1cessary in series with a 500-W resistor for a phase angle of b1j;d,av w1i h$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what1t8ah;o,knw.ee zmg00red8u 5x:au e frequency should the ckeae oge08muzhex5wtadur80 .1:;n , ircuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 W 6pdn 9 knoidku5- w2 qex/6va4inductive reactance, and 10.0 W cap6 a e4pdkwui52 qdnx/9no-v k6acitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit i., +gu xsv(mli7ak y9is $63^{\circ}$. 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 awjc5b)gb4,lz3 *3d dk ybp) lt1k c;dhas an impedance of 60 W and a resistance of 30 W. What is thdk b;p)3l5*bj gbcc3t, 4) wk1ddza yle power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing ag p*ye qq,cqkg;u4sm-1y (o ;- 6ujwrplyf3:n 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz prj3fgg p6y1q, kqn4q;:psco*y -;lm-e ( yuuwower 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-mH coil in s zi(ag ;1z4ieheries?1hg (a4zeiz i;

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is need*0sey 4dd om(ved in series with a 4.7-mF capacitor for a resonant frequency of 104 dvem0sdyo *( 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 3.7ygbq;*z/ad o c8h) q6h-mH inductor for a resonant frequenc ho8q byq6dgchz/* );ay 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 /m vh/eynf nbljr ip9)/9brtud7).i oi5 t7r;in series with a 30-W resistor and a 40-mH coil if the reson.)h 7/r)jn//; o 9p5ttudviienbf rr 9m ybl7iant frequency of the circuit is to be 1000 Hz?

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