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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 unib m)+bkg(t*i5m0jc gzts 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 inductigb(o,s;g jiws gpfev.cw,7)6 9 tom.xon 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 loo(7mlfcdh,z) wfg i;6+z rty x5ps of wire in a coil produces what kind of change on the induced rfdw6lcif m(; thzyxz7)+, g5 $emf$, 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 ob 2dbqn1cmsfaw+ :1k1 f the magnetic field through a loop of wire produces what kind of change on tabf+w1 c :bqdms1n21k he 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 produr84j02z borq7m.omz lces what kind of change on the inducz8m04j 2r. ql m7rbozoed $emf$, 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 magnetcg qz,0 hn 9wpm9s4g2jic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an ixg+a.z pz y zyuh3/hn*k4)/w vp q,ha6nduced current in a conductor will be that which tends to produce which ofyh/hx6yn+z4p ak.zvpg*h,u/aqw z )3 the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above ito*3wqzjj 6 is9l2ch -hs center with its north pole pointing down. Thqh jjzws-3c* oh9il 26e stationary 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, xu.gx2g c2*wpm7 wpbd4)xjfuesh /+ on a horizontal table. A bar magnet is held above its cenu./xs,h2wpe2 gx+fgw)47xcb p * djumter with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fieldo/k rz-xfa+g(vwo ivg17zhvu1n7w *0ff;9bw vector points71nx1vavb*r /0f hg+ ;uowoz7 giw fz9wkf(-v straight up. The magnetic field vanishes suddenly. 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 level table top ii xrz3l l/xrhc+/ o*c-n a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above xli*//hr-lccr xo3z+ , 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 horizontal7 ,1tot8l3gyjoc+ ad 8bzjj 2eg/yt(h table top in a region where the magnetic field poi (lh ob2jyj81 /+ ,3tatocget8djg yz7nts 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 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 horizoh l;j:i gcc8 wlo09v6antal 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 current cvawhog 8c;:l69j0 li 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 enteri gksm;1;yy y(1b ahmz6ng first. As the north pole enters the wire, the induced current will be (as viewed from ab ymm;kg 1zsyy(h;a16bove)

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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 spet y3 sn7e4p5wted about an axis whose direction can be varied. In a region where a uniform magnetic fiel3spttnw5 7y 4ed points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constu ywsk7)-f. 1+rwdvu kj/rtr1ant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points strr1yk/w.u rk -v+)jws tdf1r7u aight 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.dqm9c1w hfx xtplryj;6r )2+c 0o)7vx
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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 t*ybak 3w*zk y-.-l9x6 qufl z 5gls7lehat 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 fidcle a73/gn5hoh 1)vleld. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west directp oh )gd:wp5q8ion) is moved northward at constant velocity through a magnetic field that points straight down. Make a stat w8 ppd)go5:hqement 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 cof**vu19(p0m fpp crdfnstant 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 tran a i,mg s1lbd+tqs/ s.z*,oslwb1uyp;5ke86gsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The u(xc adide2w+6 z(l7y frequency of th+du2wdy(6ei(x zl 7a ce $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device use+e3nzfbo sk (2d 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 d4huh -f-c81xrgrs.zz 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 than the primary co6y/2dg(mte twc4t *lvil then it6*d/2tvgw4 ecyt t(lm 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 -v;sj *( ++p pmitylkwprimary coil contains more loops than the secondary coil then it ijl +ys+ppivtmkw -; (*s 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 inpwmac (:*mzpod f-l1i-ut

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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 ci 3k9z7gdhcmn9 rcuit,

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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 indez2c a5i5k +/(dvjj *xigypo/ qt5kj2uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the zi/xd(j*j g/kaicev5pqt 55+j2k2oyresistor 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 arehis 6c:wp8p q4 connected in series to an ideal battery of constant terminal voltage. At the moment contact is made wip:sp4qwh6 i8 cth 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 rud.muk k0l1o:e7 0h iinductance 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 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 wwi;um-z; 5) vji d2atmith 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 battery. Tu5rgxvy) ny3g/ iw7-bhe time constant for the circuit represents the time yyg5/rw-i3xu 7 bvng)required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an indu; k4m* * m*o3sudw u0d8ml3oqwv:dojf ctor are connected in series to a battery. The battery is suddenly *0:o8vl3o3ou dk sf4; *wmduwm*mdqj removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except:qsa9cft 090ra

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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 dksj .+nw* ;jds+qc(d6r 8jnithis 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 power supply. In this circuit, thi +me kw/csvo7)yp8 ;ae curreno)y;ecmiaks7p / 8+vwt

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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 vf p6d17w kktkh-t4s .d/m*/gv 6qnlxan ac circuit changes by what factor when the frequency is tripledwx s-6qlp/nkfk 14k*6tv/tv.h7 mgdd?

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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 voltagv yurj5r1.x7 ge across an inductor is doubled, the inductive reactance of thatxrj1rv 75 y.ug 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 th5dl slram6sw91/wy.r e AC voltage across an inductor approaches zero, the inducmlsad9yw1r. / s 56rwltive 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 supply. In this r08wi21xlx :85 hh tcfwy:*f0pjemps circuit, the currenteip c:8j2fsyt0rh:pwh*mwl5081 f xx

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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 byixmxse1i+/1 c 6 eok*1jar(br what factor when the frequency x6iarbmj1 e c k1(1/s+r ioe*xis 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 voliep;-tsk) l t7q c6i6xtage across a capacitor approaches zero, the capacitive reactance oiiqptt 6-6;xc) 7elks f 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 oshi u1 z lpm32tm2y6:cf the inductor and capacitor in a RLC series circz 2lcy2us6m1 p:3miht uit?

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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 define /g2k2mq mvrn4d as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasvwd,jqz +z c7ykb hvo,k *76.ues if R increases. When is this statement truo7bucqvky,v, z+7 wh.j*z6 kd e?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circ.qt ;:x yk +xdg1ndtk4uit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC seri(jc jge*fs 1:zes circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series cizny /t klwx.7b+o:iav+ + h:nyrcuit, the resonant frequency of thatxt:hn lok:+i +.wzvbay7ny/ + 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-zrzm .-g +x +xcr2u honlt1h) that is driven 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 seriesma( , 0 yx)q oswnvn5*.wu)hqy RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetipx 9h2;;tniric field of 0.20 T. Find the magnetic flux through the loop when txpi9rh; in2; 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 rotating (ts d *s y4ughf6ari73wpa0v:in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetict0s ifra7*du ya psv:w46(h3g 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.doqxq3j2.5 kb 10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneqqxo.db j 235ktic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced frb;4 c;z 1*cwm2c6ircl )fmzcdom $1.0 \; m^{2}$ 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 from .-y/p ) j(kywqf(fxbo $4.0 \times 10^{-5} \; Wb$ 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 wit ux 2b .e1i4 wbbg9g+z0wl7qfogau,a7h 200 turns of 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, find the average value of the woi9g.g1 2l0wb 4a+bb 7 fa7e,uquxgz 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 an ;dllr q*:ufm 6rxp8jlxu; 8m +vb4tc4d an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and arh93m(1fi,qghc mgq 3 hea $0.20 \; m^{2}$ 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 60scqtks1:2z nk 7w 46lj m flies horizontally at a location where the downward component of the Earth's magnetic: s k6cnw27js 1kzq4lt 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 cogxi5m 900sl q e95njwknstant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnet550s9qi9wxg je nlk m0ic 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 +jnu2wbdl,s o;u+w6 -2qxsp dcross-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 100 turhd f/q r li ,.le6py,kqmh/a9.ns 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 o85)ykpv d (prefzdcx;p rp;w(us d49j+8prg6 n its armature. Each loop is 12 cm long and 8 cm wide. The armasw6 (x e5 up r)9;vrcjzp4+g(8ddd;f p8pkpryture 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 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 of5si ilo-1*8ab pgoj:spdw 2a+ 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 simpknc.)ar b7b) vle AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic .7a )vb kn)cbrfield of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a ma,x9iy5o0gnvyu**5 daty 4u28 ix6t-i xiwkkqximum $emf$ 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 moto1bz- 4u uz o9qtpcv2;ar 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. zx-.ld lf3t) nThe motor operates on 120 V AC, and when rund )-lt3nx f.lzning 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 resq//bmj5 h3jj k7r-w vtistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is jbj/-qm75kj hrv3tw/ 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 t-w f9ch(csben* q 4n12vmdc s ,hgh2-e:b wts7o a 24-V power supply. The operating current is 1.0 A at full speed. Whasghmn*b t192wbehscf nh ce:q-(,vw s 24-c7d 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 242-)q ok;2an6y 0 r-k*ipdbrt bi kqir/-V power supply. The operating current is 1koqr62k ib;i p-0y n-tr*daq/i kr2b).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 + b 2o4xvwt9qj19p (gv9 q06fkwtdcx ra 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 transform pvqth:,w +b8ler causes 14 A to flow in the secondary. How many turns are:q8tv whpl+ ,b 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 necessary in a 110-V primary ik2;yrc y qm)w0f the 24-V secondar q) rcy2k;w0myy 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 2yqz9q;+z f3o kjn/ r6d000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primq+fz3orq/y z d6 kn9;jary?

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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 prie myba,qosskkyy i(+ -i,p7 /t*x8x2nmary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow sx2 7/n,y kkts-8ypbmq +,y exai(o *iin 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 trdmfpfq):y/2;nngt 5 33prd wx ansformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whan5pd3q)y:tx /2rpdgfn ; f3m wt 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 ayy5h9jcv)hgls)uu* */ djx r.nd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage h uyhd9j *x*. g)v/ruy)5jlsc 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 secon:sn +in7m:u m gjj5g;1k1drxddary coil. If 120 V at 2.0 A is applied to the primarydgj kmd: x5s:gnr1;mu i+ 17jn, 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 secondary has 200 turns. If/) lal b-dp8yiq(w+gr7( elup the input current at the primary is 100 A, we can expect the oulg l( y8-u7)ap r+wib(qdpl/etput 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 transf-wwwbb8. q,v qormer has 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 tw8,vqw q.-b wbhe 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 secondaryysj0re:ly , *itdyv41 has 200 turns. If the power input to the primary is 100 W, 4*s01 ,rytjv edil:y ywe 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-fpsy1qg j(x5. tb7 pq 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 number of turns in the secondary if the primary has 200 turns - 7ppg(jq5btx1fyqs..

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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 voltag2bu9(8sc ec 8py5upktx t rs +6whuiey7sy :.:e is usually stepped up to 4500 V by a trskp2e+rc ws5 s.u u:y ybi:t6eyp8t97u ch8(xansformer and transmitted through 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.+h /v7p fmlvn-z3 21y2m i4ljvghx4fu The voltage is usually stepped up to 4500 V by agp/u hf m2l mf4yi7 lhj1z-34vnvx+2v 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. r hahcur:8(1lx7l a:i 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 of 100:1. What percentage of the original energy would :iac:lh8(r h71luar xbe lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gejr:)8xp r /pjsnerator 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 axs/8r :j )pjrp 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 transmittedp4rz( b 7 - hg0/euk;ll:lrdkr down a 6-W line at 1000 V. How much less power would be lost if th0:bh l/rkr4k7z erpu-;( dlg le power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transjuh32 y gg8vafi(y59-e2ra mgmitted 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 transmissionjy8g5i3 ryeg2 m (agafu9-vh2 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 th orwcu0y1dw:cv*5-ilc; a ;urd +n lq;e coil'liu0+wv;1cr: dyrlwu c*cao;; 5d- n qs magnetic 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 an7 l9f;qkkr 7 nkmj6 .l.2nhbtmd an 18-H inductor. What is this circuit's time const .bf7 q;lk tm7m6jknhk9 rnl.2ant?

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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 ql (+mjwgr;+7iu 1gzzan AC circuit 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 peak c h ,xlfygfgk32ore z3 g+(o+7uurrent?

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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 resistanvc*kob.i a 3p,ce of the lamo ic3*vk,.ap bp?

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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. What is then mg*a 5r:/pin peak current throu rp*nn/5m:a gigh 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 supply. What q 41zxq;v eu9lis the power dissipated in the r zq4xu1e;q9vl esistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor .b ;+egn*vz:qf ol * tqk8mwi+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 ep ( ktamml4ph.64 3gya 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50b1mqww*as1s+ jekht: g 0:ow;-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 gz d5ecv2nl/1l: 5e:chit b5pof a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil i7:y ;nl6 egr4ls,1 kpqglju +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 W9px5p yiewmid -u5 o;2 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 7 ;hzumvbw p/,(z/vkw157 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 freq(;lm i 17 khkybp5q;qguency of 20 kHz is app;7 ;mpq5k lyk1bqihg (lied 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 2t buno- o(i01s.50-mH coil due to a 110-V, 60.0 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 react/ 4iy*uq 6veglance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W ozw2 i4su ,tes)f capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-m3 1ey f6qe-,e8ecrohbF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0vmlun8 9j xvre/4d+wc03)t/uke 9qrv .010-mF capacitor be 100 W?rv0 /8j+3/ e9r w vvxe cnqk)l9m4uutd

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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 :b o.mgbq-panh 2ia0. capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 Wl684w7.6htla.yh j ktmjqzd, s.fm /v inductive reatdzs 4faw/v. l6mkthyqjl,6mj.7 .h 8ctance, 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, 20d au,01dvj3 di-mH coil, and 1.0-mF capacitor are connecteiua j 3,ddd0v1d 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, 5b h 2 ttnehek0gr,b8020-mH coil, and 1.0-mF capacke heb 02trg805h ,nbtitor 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 connected in series with a 20-mH indw 6-9tf+e6yt h7ythziuctor, what is the impedance at 1e-hhfy+966t zwi tyt7000 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 inyjid 2 wuuvwvi.15cf:k2e 55cductor, what is the phase ce55 k.w d 2v2ijc1fyvuw:5iuangle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-m5kwa/fp rpq *;F capacitor for a total impedance of 100 W at 15p;/k*qw rpa 5f00 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 ivu tj)t y9::b6wm t:jxs needed in series with a 100-W resistor and 15-mH coil to get a total impedance ofwytt:6 t9mj:j: v)ux b 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 series with a 450-mH inductor at9to/z; i cd ryo4qu*c1wjq)/e 5000 Hz for a tot1/et ccoy)qi 9q;/woz*j u4rdal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in seriz6s f*-aq 04k(au-hkpyiah ,4 eytod8es with a 100-kW resistor at 1.0-MHz for a total impedansozaa 4u-*ti p( hyf0ak kdqy4e6-8,h ce 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-mo qxw21 8dbkk8 nu.bb )h6m7nkF capacitor. What is the impedance8xnqkbb.o 7 6wkub2 8hkn dm)1 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 capacia +w) sxum7d9ctor at 1.0 kHz for a total impedance of 45)+maus7cxd9w W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 iljkm wykc .3l0h78g 4kHz for a phase angjciy7gw hklm.3480kl le 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 l(ti(hv7f vpgie30 5dnk 8id1a 30-W resistor at 1.0 kHz for a total imped1d087givt(ev(3 5 lkhnpdfi iance 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 jmrxlk,1u7 f 2series with a 100-mF capacitor at 120 Hz. What is the phas r2uj,l k17xmfe 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, 20-mH coil, and 1io4(o fu j:nx1xy-vm*.0-mF capacitor are c1j u (:4x ixonmy-vof*onnected 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 ca9odu26ju b.rqc w. es as)5-fnbee4;epacitor, and a 0.350-H inductor. The circuit is connecae-c5ubdbouj2 9e)f 4r.ew ;es6qs. nted to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive rea2 (7 ou+ *jljtk+eu(4bp nrpebctance 30 W, and an inductor of inductive reactance 30 W are connected in sb+7u+ pl4o*bt(np(ek jru2 j eeries to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-;9q hq4* j)np/zqocps W resistor, a 10-mF capacitor, and a 0.45-H inductor, when cop/qqs9* qo4h; zpcn )jnnected 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 necessa1zgdhzkmckv-6 sre5;c8.dyi 6 ; mzg,ry in series with a 500-W resistor for a phase angle oy 5c gh1e-mvrzdmkz 8z6ic;sk,d6;g.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 = 10.0 mF. zg vh:mguq25,l2 l(hd At what frequency should the circuit be driven in order to have maximum p5 h dm:gl(zlvh22gq,uower 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 ws vh .dtj 2lgq- )h7z:lpb5em8ith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanm z-h5 vpd7g 8l:bt.sjeh)ql2ce, 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 ciwhd ,;tz0h( 3/svc)p+jwgaj brcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance ,/6vs1c .8 u jakiznsbisn3j 1of 30 W. What is the power s31 j 1kjnsuzv.sai i 6/c,nb8factor?

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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 serie8 4*wq asjji9ws RLC circuit containing a 50-W resistor, a 10-mF capacitor, aji4q waw 8js*9nd a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitoo-a :t0ivq/0po f5f, k/vqpi a*m,sgnr and a 15-mH coil in series?f:faq/ ga0v05 /oni*v, poq,ipmt -ks

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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 capacitorg4pua2 b7 4dw bjkn226pj7nfz for a resonant frequency of 10 kHz?27ubk7w 44ja22fnjg d6 bpz pn

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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 witf93yjs9 6xq bmh a 3.7-mH inductor for a resonant frequency of b6993msj q yfx1000 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 mu lv6d3-7 jimwqo a0)lgst be placed in series with a 30-W resistor and a 40-mH coil if the resonant fremj- di 70vl)qa6lgw3 oquency of the circuit is to be 1000 Hz?

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