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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic d1metkr1 s qes xg2s(y5j07 3mflux 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 states tncqn(67pv- ovhat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces tqzh.1qm .t4hwhat kind of change on the induc1thqz qtm. 4h.ed $emf$, 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 thr38c bh bbp05zgough a loop of wire produces what kind op 8 h3bbzgc05bf 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 t3 )b 34u gypp;cr+lvwa loop of wire produces what kind of change on the induc pw tvu43)rpybc;3gl+ ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magneticg cy d3nn0wm45 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 induced current in yyb)skm ta9i)p0*l)rbm 5/l d a conductor will be that)bmipb9dr k/)mll0y5 a *yts) 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 horilr,6:ps bj vi2u8n7 ih enzb)6zontal table. A bar magnet is held above its center with its north pole pointing down. 2b6shie pvn :)r 7 l6,zibnu8jThe 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 on a horizontal table. A bar magv5(k(zg t6yjcnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the 6z vcy (j(g5tkfalling 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 regionjj3tv k*(on6k)d; 7/i wrxjqc where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When vj6;7w v icj*krdx/ot jk3(q) niewed 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 in a region where the mandu/ fy .vgbb8u).7d6h3nfb +hovl :dgnetic field vector points 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 indfg38 /6bvo 7ynl)f.b hndhd+ ub.:vucreases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a regio:d+qj4p3iz q wyj)sm- n where the magnetic field wp: z3) diqqsj+myj4- 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 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 horhktqv) qx 2:af +bs21oizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the tabsfo1: t+avxqhqk2b)2 le, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wirps/yeh)apd5 9;8 ef ude with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abov;ps )eyd5a98/dhuep fe)

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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 o2cqfi2xmq0ei.t-v.23 w cp dangular speed about an axis whose direction can be varied. In aq222dfp.t- 0 civ3qce wmxi .o region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant ang(q2x/ uax6fk kular 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 rotatu qa2f/ xk(6kxion 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.aoe- u8 r6pre,
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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 thatoy:x6e)vp8rv2: pqopo (as f0*s* t 6pkpmp1j an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Thegyweo906tb ozu+ x1z. $emf$ 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 v2ma+esfm+ b -direction) is moved northward at constant velocity through- fmeams+ v2b+ a magnetic field that points straight down. 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 angumoqm j2d -uoqep1q **9lar 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 transformgvg t-8)syu.(hsng v z2x88w0tcxg6 a s

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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 608xf-m:f,9+da(o w ) aeehtrys revolutions each second. The frequency of theydw-o:a8exe)t hr ,mf9f s(a+ $emf$ 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 used : 9tug exf6swh6nqek 0 ;a2s8kto

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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 devic*e ue570wq lvie 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 secono+d xb.- iqz.bdary coil contains more loops than the primary coil thendi-x.qob z.+b 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 contaj j8bar (lh2xbn vj,2guig-.8 ins more loops than the secondary coil then(ax ru.2b8lb-jh ,g 2gvnjj8i 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 iwi mw4n ly9cc -kb)l)/nput

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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+l w 4ku izu5;b5h3pyeit,

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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 connny+a: e bv6 xj3zms15kcbd; 9a23bz vgected in series to an ideal battery of constant terminal voltage. At the mo5cj de3zn;6 +as3yb m gzvabk2:x v1b9ment 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 inductor are connected in series to an idearjb vxp:9.r r6l battery of constant terminal voltage. At the moment contrrx.v9 :rpj6bact 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 and resistance R il2oj2z p2nb t e/cvwmid (91*ps 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 residxhydtj19 x+;+z k u;+4bevu gstance 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. The time sqmx.vkp :gt4 ,+0kgmconstant for the cqp 0.tg4sx:,mk k+vm gircuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to 9d ioyf;p/, y2gq .-kg+5 gfc:bekq vua battery. The battery is suddenly removed from the c:qg fop k-,q5gc2g9yy vke +.b;/dfiuircuit. 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 7r6hiyb hauqe ngzrl:/ a18gt:7 qq:+ 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..2 (2om dloq:8zoeri1m c.:w t,zoul x 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 power supply. In this circuit, the curren a)cqde;h. (aoqao a(.c)h ;edt

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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 h.pb4tb 7t0:cm.fo pbd:/irh changes by what factor when the frequency is tfocb7p/.p h:t0t4:b ih.r d bmripled?

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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 inducth/r gnx0dg 8lfzh 0kz0dr(ayb 982t3 tor is doubled, the inductive reactance of that induct 03r 0 ahf( 0 9kgg/dzxldz28rny8thbtor

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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 inductor approaches zero, thepjsws,ss a pq1/:e1h7 induct, /s1ap:spsjh7we1s qive 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 / +kqrt(3w5rq np4axd59nvmp supply. In this circuit, the currentqpwn a5nd qt4(+xpkr v/ r3m95

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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 t:h,c8l w:lh 45yq sknahe frequency is tripled?hl8lh y:s,:n wq 45ack

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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 caj /wnxjhy(ptw :y2: d1g3sx7m pacitor approaches zero, the capacitive reactance j1( : whjxgny2dmy3sw7 p x:/tof 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 inductor and capacitor l0v(4chdp +*0pfrwr r in a RLC series pfrhwl c r*r 4(+dv00pcircuit?

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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 RL)8 n3oxn7uxc c h1zib5.rcj/nC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of th7py xwx xn d+d;fd9x./e circuit increases if R increases. When is thxxnydd./+x; 9p fdw 7xis statement 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 ofvbpaozix* c/ms,79dh3x:8n vn i;w:s 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 t7. jyfw;rntc) (brnn..r. b tfee1h3e he circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, tugdo)safn5 ipc(:( yu4*xa-k he resonant frequency of that circuit wg((5 sc*k4iu: x )dy-aonpuafill

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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 t v-8r 6pulgmy(hat 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 series Rblf7s 048mujhq ou:*mLC 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 03z3u me fwxa9(.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane (maz9f uw3 ex3of 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 in a uniform magnetic field of 0s4*w)h-am4 szkiwi zi+; y* ma.20 T. Find the magne ims* i-hs4)azy4imzk*w;a+ wtic flux through the 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 rad- ejj knd1g*-uy:g:u+q3mjh e:7s xtrius 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 loop and te:uu7yq* k tg+d:er1hmjx3 jsg :n- j-he 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 adjustable s n7x)tfsk u /5*hckl -.4s6fehzvwo8dingle 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 m* jhb/h2cwn- changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. A y:*zst0) ek8wne 1sphuniform magnetic field is applied perpes:8 k)ee w1*p nthy0zsndicular 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 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 andqkwr73; o3s lh 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 *7h nz;p/ leqq 6/o0z xbaqiw +s.sh;aand 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 pu5/o mkss50jne*l2 phorizontally at a location where the downward component of the Earth*skpm0 5je up/l2nso5's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m louz9 vs0ow0fd, ng rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends sv uf 00o9,zwdwhile 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 generatol+ 5er,jwx5awg5o9 a jr has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of areaytghdxw (e j2dnib+g:b o2 .( n6u*iy2fj;we. $0.090 \; m^{2}$ 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 igfpc89tkzz ngd *t 5q,6; f,aus 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 pf96,kc f g an8, qut;5gztd*zperpendicular 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 oa :nyfs(59 ih8apmg(wf 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 coafe 29ei eds.pgl:4qc vc64e; nstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotatief;4glc2ad eci 9vp eq e64:s.ng 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 generap/a2l 9jgk5f yglwfvg-6:h* otor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The moz;du sgx3gut*r9*xi2-n4 7zblrj*o q tor 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 operat *jaj 9: 3y*6loa ;ojqgsz5kcies on 120 V AC, and when running at full speed it generatezjykg9sa:5cjqo*o;ai *j 63l s 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 con e 5u9wffc/ysyr55-2gy rv4 qrnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cuy9/yqfs2 rvu-ywc5g5fr e4r 5 rrent?

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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 intern4hutku3o2 f1tal resistance 6.0 W is connected to a 24-V power supply. The operati 2htou3t 1kuf4ng current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance lqwi,fm yw :kfx5155v6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thfwv1q5i mfw5l ,:5ykxe 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 ap7z18 uj2+to f *bz uktejaad5kk/v 95 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 transfwzj.2h3.w mtyormer causes 14 A to flow in the secondary. How many turns are in thet. yhwwm23 j.z 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, ho3vu: :m0sfg1:x x*ddcnkdfy 3w many turns are necessary in a 110-V primary if the 24-V secondary has 100 tx:k:3 g 3 d0fsvdu 1nmydfcx*:urns?

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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 2000-turn secondary coi pjp,+.qll(ql q+(ljl,p. qpll. If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effici;y ja+a(1 bhicency, how many amps at 24 V can flow in the secondary;hba( 1 ajicy+?

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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 tranm qms 4.f7plk.sformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. lspm.k4fqm 7.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 primc74 v*cvfk/v uary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltag7c v*uck4/v fve 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 hasksih c2pmz;dxhj p6 m ,3.)(vsm2 k*kr 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is pxpk hszmjhi*( 6. r322mkc,mvs k;d) 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 tu duj--r sun8j-rns. If the input -djr 8njus-u-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 h9vtqk6c r /e8xh4 ofxhxwr d9)-mw(l0as 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outrf(h/lt vchx9w0)6 k qd xe84-xm 9owrput voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 4u9e5a7 pkzr;l z4c 9vm ryar2turns and its secondary has 200 turns. If the power input to the primary is 100 W, wepyca 7urarrme 45 4zvl9k9z2; 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. Tht.sjmiza *7t9 e 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 j9tims*tz . a7turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 1m,+ *mr j9i/ i(clb5vf z pgvjz(oho160 A of current at 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. F hjic*mg, 1rp+(bm(oif vov/ z9 j5z1lind 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 cur,+ 9x bvm ers/fe*iw;lrent at 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 power lost in th/re vw,i*f 9ms+;xbel e 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. odb6ak0 nci)*1 syaqx2-5adzA 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 bao*qcz )5axd dikys1062na -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 m a )11xnbl*cyzc v+9k/;yyyi50 km long 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, 1y labzc/9 v1*yik;+x nmy yc)the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would befr(sx3pc 2m1fmn cd6; lost if t12cm;fx6 pr3 nsdmf(che 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 t. .gjpe/u co*1yst e3z an;h0mo 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 pop .;*a 1nhycs3ej0/.mtou zegwer 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 egw 9rh 8x4+kjcurrent of 5.0 A. How much energy is stored in the coil's mxj8wr 4k +ghe9agnetic 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(crlr tny)s-k era(7q72 : ewgke ;9lu.0-W resistor and an 18-H inductor. What is this 7r79 ne;srr-(aluce2 :q e w(kg)tkylcircuit'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 u8q;(rt ufvezb zso7j +v70s3an 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 outlez)y/mll2 mhd,u;ko bbgr (;b :t. 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 a7ac+kykn8ocj+r am +/ 120-V AC outlet. What is the resistance of the lam+ + jc on7c+ya/kmr8akp?

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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 iv.gf*dgekcrch6 c5v(*e j-p (s the peak current through thv6(r d gghkc*v5 cc-.(epef*j e 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 supplym zz5b.; sfk;cg0 a7:s)onmp:puvne; . What is the power dissipated in the resismg5zvsk pb en)c0aouzn:p; m:s;7.;f tor?

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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-Wn/pr:m)2a.qqqy 6n:7 6besetj owx2x resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a /1sd5( 2i evgpll uh.e50-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 u)y i6ts-zhq+7-mbe f$I = 0.80 \sin (240 t)$. 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 ind:7stupury8 * ductor 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 wi ,x:tm8+ nsiov *ur6reactance 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 reacz 8rw5 ,p)omjg 13e*l vs)crirtance?

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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 rf x7m 7xtbb)49ioli ,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 frequency oq7fd+kupn:e9,mbq 2uf 20 kHz is applied to peq7nbmu+kuf9,q: d 2it?

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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-mqi1 muvb)/uk/5g,d-k w id10ucl.nwjH 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 reactance of a 4.7-mF capacitor at 10 kc kpczg+z: u0 :(sq7ok8lmo x-Hz?

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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 nr la:2c w ja*s9 bf/j:ng6f1* wobj0mueeded to have 50 W of 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 10oy 4)*dx*qgomr +vyb )-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 dtrndji6)bv6y +hmr3 *03som 0u/tbd0u dx5h the capacitive reactance of a 0.010-mF capacitor be 100 W?6 tx0r*)ud dyvob5 rsi+3 hu3/mm6 tbd hd00jn

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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 ,p-+5jgd kmqohgi 04n 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 sernf5r71b, c il nq7xcwlnzg3/u z37+pkies circuit with 12.0 W resistance, 15.0 W inductive wlzr3l757iz xgn 7c,+cnf3b uk n/pq1 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 impedanc qazgza7ch* 70e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in aq0zg7 ha*c7zseries?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mHd4.1bys nlc: ciuv8 -yt6e pnqd1a8c5 coil, and 1.0-mF capacitor are connected in serieitdybc:dn4 .5 vpsu68e1 c-n1lqa 8ycs?

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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 inductor,.w8i fy+e 1ltb what is the impedance at 1blwy+1eif8 .t000 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 -ddgz fn(qy4 gpf-,nqob*. e;is connected in series with a 20-mH inductor, what is the phase angle at 1000 qpd(4ynzdg; bo-f-qeng* ,f .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 n2 :p6-d9asb0oh8verm :bi fd meeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedmfh m bbv6ai8res9:p 2do0: -dance 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 followi*jag2xal b0;hy5iea42u,gnc 3s t q)ang capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 Wa 3u c0nlai;bg aj2s 4qa,hxte*)g y25 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;h pyansf8ubijl1 ve-ya6e,h)o,w )7 450-mH inductor at 5000 Hz for a total impeda)j;i yhos6a8 ue7 -p b1l)v f,wy,anhence of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100b,z 4ueo5(ep a-kW resistor at 1.0-MHz for a total impedance of 150pbz45ou, e e(a 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 witho.h zvl95cod; rj/l5 *z wm*hx)et9qc a 20-mF capacitor. What is the impedance at 1000 Hz?*5;t* 9 9mvl.cc xeqhh) ordz5/ lowzj

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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 we37lv8:ll ruzx1j.0ub cc0w series with a 10-mF capacitor at 1.0 kHz for a total impedance ojl8:.l30uzwr ev1cbw 7c uxl0 f 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 9:u .9sthyg ouwith a 10-mF capacitor at 1.0 kHz for a phas 9.9tus:yhou ge angle 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 i2:c epk7 ij7hiuc2n r0c: jwz)n series with a 30-W resistor at 1.0 kHz for a total impedancw :2:cieczihpu2k7 )7 c rnj0je 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 ser zz79y) hrv wc)7ta5qac+i8ories with a 100-mF capacitor at 120 Hz. What is the phase anglqz hcrt 8+zyrv7oc5a)) w9ai 7e?

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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 i3hx0iafz2,k.i)cu t-mH coil, and 1.0-mF capacitor are x,ci ifu.k2ahi)0 t z3connected 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 capacitor, )pcv5(ybbdrul3 9k; xand a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hx(;p3bd lvb u5)r yc9kz 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 reactance 30 W, and a3h-tgu3; hmeo wix ss/h .*nq8n inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz pow th8e-3iq*sg3h /mns;x.ou hwer 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 ctlj t f(zh:y(u+ft)a;( 6 xsrkircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pfsthl+t kyjat )x(: (6z; fu(rower 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 for a phase angle o4um1zv 9equh7z2uuth/ g9 i/d f t z hv u4u71dgmuu//zih2q99e$40^{\circ}$ 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 = 203n3z-copbjv)aunb : 0a4w 5ia7g c 6th.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum powvbp3jz)5n3wgbh- auna c co76t a4:0ier 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 resistanvahinn, d6x6 9 6ppkw0f )pqu1ce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit wi6ppu k a nhx6d16fv,np0)9qis 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 Avps 2gv;oq.r0dup2; c C circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedej-( z qucc0m6)j2uljance of 60 W and a resistance of 30 W. What is the p) zq2em-u(jjlj cu60cower 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 cont:o z8ot *ljeorszf:. .aining a 50-W resistor, a 10-mF capacitor, an .:.zoseo8z:ltro f j*d 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 1jr,a4 r 03 bbve8 ocb/2vrptmcapacitor and a 15-mH coil in series?03v bjb8 eorp14 rb,mct /a2vr

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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 oqd3n. (ijut+series with a 4.7-mF capacitor for a resonant frequ(q out ni3d.j+ency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH in1sdd)f lw2-th ductor for a resonant frequency of 10002d1hw-fdls) t 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 andup /rdka9;y(f a 40-mH coil if the resonant frequency of therypk(a9 /d u;f circuit is to be 1000 Hz?

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