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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 magnv fm5dehl z;;:+3mu etetic 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 inductih4w xa* 6k7qr xr-/nnion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chang,ay6 l7g)yroghe3-2hj 5plxde on thgl)ly,3 7y5 d6 xrj gphho2ea-e induced $emf$, 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 magnet3 b0cday;roqi1aq, b*ix3w4 (t qw8vcic field through a loop of wire produces what kind of change qbt *i;1w4 oqavi38 3cy(a0qrbd xwc ,on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what zn eyb-5nbt ,-kind of change on the inducedn -5e zby,nt-b $emf$, 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 f c heb2k. zm;4,4r(3 lsqxe)tt*brnvv ield 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 a conductor wiqfr pzn4-3uj6 /xizg+ll be that which tends to produ64p-3f i qgn/zxr+ juzce 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 m xmwm91joczuk g4*m /zb87)ahorizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary m8a9zcwk7x4buz1m)*momjg / 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 b ag)(hvw9*4az 1e(huypd ww7md :ru7dar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when dmzwah9eu gwr7 *1((7)p4 dhu:y vdwaviewed 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 t** orgji; uv2eop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current *o2v;u*e irjgin this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnet)n(g3 6 elx:4vtnz rz m4w-uilic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced cu3i l6u- )mn re4(tx:z4w vngzlrrent 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 in a region where the magnet( +o,,dd7k sr2xt 0ikm4y2.vylvhew bic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the 2,tsvxvdkl +70yb( he i,2oy.4mkr dwdirection of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasin p:d-jwtc lj.pdsq*5 sz)a3w;do6+vh g current northward. Two coils of wire lie fod6la:.v zpj5d +p)3;*wsd wc-tj sh qlat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wlwi ls8 u1/f ox-sv0k5ire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viu 1ioxf 5s/slkw-l 8v0ewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about smi1z4x p01 ;ixa a3.httu(wodg9 5 oaan axis whose direction can be varied. In a region where a unifd19i3x pia.h wt50tau oo(1 msg;a4zxorm 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 angular speed abousz-0vz*8sy8tru7s *jgz . cxjt an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the indu u7sj*x0tz v zc8jgsyz*rs .-8ced $emf$ 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.ga geqr 5r;gmdo0y666
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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 c2 to.in/uq p)bop5e2an $emf$ 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. T *pau;uw-(pt phe $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northk .h0l/ s4zbgbward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induceglk/s4h bb .z0d 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 angular velcyn8po myuj zxl8e(a.nys91 m*5 ;oa7 ocity $\omega$ 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 transformsvxx-ei 5/s/02ukec31yolw f d

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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 frequency1ucev r3+nk,v xq8)z a of trx31ez ckvv+nq8 au ,)he $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used t+p,bowu u-d+lpd- ae/ o

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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 thathq;pkj :r44ac5r 0 swd

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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 containsfh qt)gm7xyki) 1z-0p more loops than the primary coil then it ix1 fhky0)p g7)ti -qzms a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondar* +vkc5lebef 3y coil thef ee cv*+b3k5ln 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 input ha( ;,l2dzuqb5g3t .ev vo,up

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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 circuit9kd1: xqv v9xb9r:moi,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an 9 60aoau 9 qeld1fd1oxideal battery of constant terminal vda9o11d6fa 0ql9 x uoeoltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery ny )ck:)xrq.ac s/ ,/ + caeu23-fqbl0eilhc sof constant terminal voltalcfqka, - in/ sl)cs 3/0:r a.by)uqeec+2xh cge. At the 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 and resistance R is connecttj0a(j6dah( prlcwnz. n,2o5ed 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 inwevgbdxb4n8j pb ,18, ductance 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 connhaebp :nw 1:t8hz s94 3ycrk-nected in series to a battery. The time constant for the circuit represents the time required for the current tykap3zwen nb1:c8:hs- t hr49o 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 series0 d/89; nsd bntglwli, to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease /ld n,tb w ni8s0;dl9gto

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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 ex9g7:weyv.6b qbnc lg; .e7tbfcept:

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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 po3woijdn 5 )gg3wer supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to : xdas8m j+u.:,hulzsu5h(d y an AC power supply. In this circuit, the current:zjxa +uhd.dl( 8ssu: uh,m 5y

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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 freqee * fnj )/sb1ol5txkd+ b:vq.uency is efq:1xb.d)lo nkbev 5 */ t+jstripled?

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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 induc4 ba1a1rz.8sf -ls0c s nn5cdbtor is doubled, the inductive reactance of that ind-szs alc4fca1 1d 85nnbb.s0 ructor

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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 z vbl-m ;yz 66duaq*.gaero, the inductive reactance of zbq*lv.m-a a6yd6 ;ugthat 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 circuit, t ej) ,1aizkk6v (1vk7ccxpd8e he currenc ) c ak1jdv8,6 kvie1z(7pxekt

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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 ipd1jf-/jda ezn) w92 when the freque-9edf/j a)z2ijpn1dw ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acroic m y.vcb;e2u;g0n0wksns g 0rgm 8k/03p4ewss a capacitor approaches zero, the capacitivbs;ng3wyp0/kusr0 ncm ig;e0e cw8g 20 4mk.ve reactance 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 inductor and cap 0z,dymn.r+n m93vgo051si 4yp pwbzwacitor in a RLC series b p05dwn0mr 3p ws.iny+zgy9o1,mzv4circuit?

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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 circuitskvpav-wq4 5*i;v s (y 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 tn*piqer90ag 0:av g.khe circuit increases if R increases. When is this s0a*ep g:n q. 0arigkv9tatement 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 the ciycae: p nj*53trcuit 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 circuit inuq0io nz,d) 5fy,7.*- cc h c(p0nlwxauqyr,rcreases 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 iuzeo *3,;v7/ cgl07 r (phiv,ftgu pugn an LRC series circuit, the resona p 0/ ucupi7 o,g,gvgvlfzh*( r7;teu3nt frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that x,.yzguqbuc 9kyx . 8.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 RLC ciry.phg fvud, *0h)nd/ ;phc 6sxcuit 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 magnetic field of 0.20ctdkv:sw9p 8fn 3 im4( T. Find the magnetic flux ( c3wf ms8vk4tndpi :9through 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 rotating in6 mf1pc 4jv u:f*clex9jg3fj: a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magne fvlc j1cm9:f43jegjp *x:f6utic 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 radu7l-i k-iw q-tius 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 the magnetic field vector are at an angle of qk7i- --itwul$30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional areguqo/w3lc/k xfbkci0-7p+0 qa 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 chan nw4l 5b 0lq,pq dk7he q3v6dnuyl**4ab y:0wlges 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 sidesb9sb s2 v+lz4y 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field chav2+yz bbss 94lnges 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 turns8jjip,l wo,myq9wgc 7 kn11g. kpd 08v 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 and arbj-6ah/atahc y9 :qy1ea $0.20 \; m^{2}$ 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 w-lrxlv* ij qo/) v.au- -rfo,qf8jj-yhere the downward component of the Eart-l*. q f8juvr- yirqfojlj ,/x -)-oavh's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angul4 s dtkxn0f:o6ar velocity of 2.0 rad/s about a vertical axis through one of its ends while sd6 nt4koxf:0 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 h9s;wcve67n oa as 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 d.ap1r1b3j nwf*gv +yof 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. +6hxci 7x7fdz3nzq vndqf60jd9/g0 l Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be 9h03i jcf6ddfng/q7z0zd76x q+n vx lthe 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 consi.q 2j:;n2iq b op,oxhysts 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 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 96)pcfhkg*p3ntvdlm -j :ccu r:* q :fa simple AC generator with an output of 12 V maxim hf9mfpc3:dn*qc lj6ct)r-g*p :uvk :um when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a/eg,xc7pt( hhrn/cxb- 8gp5y 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 bxe 8nw;l0 (tr;*d e28mgmuiw6iiy6j 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 opsk5- - yx 3gz1adv*zfbo+n4 zverates on 120 V AC, and when ru4xkv-g*fa ynv1dz -3szb+zo5 nning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected d.b(v s .*maek qey4x:to a 24-V power supply. Th(msae v .:4yqd k.*bxee operating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal rqrn0gm mrxs;6y(8( v rrw,7nlesistance 6.0 W is connected to a 24-V power supply. The operating cursrlny0rr(, mrg(x 6;m 78vnq wrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pn (wqi .6jken iu3kz5wy w:* -u3dev*jower supply. The operating current is 1.0 jez*v3q* nk. -63 (5iuwdyuiwn: ekw jA 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 uz/d8 oc ,n;rb2qul3q:k .bey needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn p muwkl5;w(m 4trimary of a transformer causes 14 A to flow in the secondart5k4m(;ww muly. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necesnj) ra u,;u26amzeebyoyqd6 :q.-k 6jsary in a 110-V primary if the 24-V secondydqek,.n;6uea ja6zy:o2b6- u)q j rmary 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 pr byv77y:6kk3f7e tos ximary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prim x67k7 yk3eobs:ft vy7ary?

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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% efficiencyf+l )kfxpy67 c, how many amps at 24 V can flow in the secondaclkp )y f+fx76ry?

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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 V at z :tas* 4tb 4urd(wg9s10.0 mA. The primary coil operates on 120 V. What 4r*wt ub:dgs9( zt4sa does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turngrwm :d9i:;lhk(lfq. s on its secondary coil. If 120 V at 2.0 A is appliedmik;.dg::(9 lfq w rhl to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer :+fs9/srmp4a g nnxf/has 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, ws:smf4xn// 9p +fn agrhat 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 transforcf7/pyq; u 3pi2 vd4ppmer has 100 turns and its secondary has 200 turns. If the input curpqpp;dvfic3 u py2/47rent 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 has 100 turns and its secondary has 200 turnnmp+y 9b-meru/t,j0e k2f9lls. If the input voltage to the p-+erlk0 2bj99em, mtnl yfp/urimary is 100 V, we can expect 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 transformer has 100 turns and its secondary has 200 hy djx)0yu/ a.h agwl97btm;)turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional.d9;m 7u)b/ x tg)a0hwyaj yhl 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 v f n2q4jm9/b:rq -l rw:w.nsqvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistanqrq./9j :lmb2 rvnfw- q4nw:sce 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vol( 00 de41lt59zpvjdam zrckb/ wxtu70tage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find ze0mlvu/b47zd (0j5t p 0tdwrkx a91cthe 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 currentsi6vb os5d, q5 at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1o d5iqb,s 6vs5.0 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.jjln-j0j(lc ,btw+s fl50p -c A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line,nslj0pwc0jclj , -l -f+t j5b( the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistancoc-vq6 zc8il l1pntk.8n+cciv4c 2 2be 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 of 100:1. What percentage of the original energ1+bvctzv282ccq4-c.nk6lo n8pli i cy 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. 5wo ftr,, +irlq4ump )*zkbbdde(04l How much less power would be lost if the power were transmitted at 3000 V instead of a,,b kb+lzem*p5) qutd l drofriw(440t 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 transmitted on a lq*),7hs aqprh ine with resistance of 0.60pshqhr) *7a ,q W. To what voltage must the generator output be stepped up with a transformer if the 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 c18 .x pw)wk t5dvc(szrurrent of 5.0 A. How much energy is stored in the coil's magnetic8tp( 1kswrxd5.cw )v z 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 contains4 68tgbigvy)n a 6.0-W resistor and an 18-H inductor. What is this ciry)i 4tg6vngb8 cuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the/gd io8a h 0fm)hv*c)v 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 intfu:g so-0ype(o a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of t5 fu/9y qr 3yo7evvsv9he lavv yru/y9fqvo957e s3 mp?

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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 conc; :4l*gom)aga 2;9omteidc wnected to a 120-V ac power supply. What is the peak current through the resistor?; o m9owdeicg ; l:*c4t2ma)ga

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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 the poh3l0psd)vh p.x 8k:nf wer dissipated in the resd3nx : vh h)8sk0pflp.istor?

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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 a+ txh4k-er.kt ,u5yb 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 50y30 kgcp(bt a8g4j) qac )- *2ubbkqnq-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 resistor4ukvol6zj 31 kv b2m+q is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH induct; 7loir-jh g6n743hv gbd7hbpor 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 reac fn( fnc;ghuz*;7 6exr3vsz 5atance 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 inducip ir,4;8a7rl2yq n srtive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductiz/bor;5 7hpb1w mcn p.ve 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 frequencyo.ogbqp28rdvv/tr quw5 ( /m7 of 20 kHz is applv58 v/rw.p gd(tuo/bqq2ro7m ied 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 soum vy6 v,*z-)xt9fc tturce?

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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.laeqz x/ow+c:.;.df7 vd1q zp 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/,9bchg- cc 3u6ywmu z 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 10-mF capacito 1rl s623a6h; 4zun 4tfaxbkrur 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 csv8/jbsyqa3; h).u ryapacitive reactance of a 0.010-mF capacitor be 100 Wr .;ju8vys) byqa3 s/h?

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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 andw sg*dp-+ /lde 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 w7oxon:ftb8iw ./c mm,ith 12.0 W resistance, 15.0 W inductive reacf78.:w xmbt,/ inoo cmtance, 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-mH coil, axar, l-5f q( l0em;nez;y.vyt,x6iro nd 1.0-mF capacitor are connect mty6eey;r q5l-nx(f;, oi .rvaz0x, led in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-m6iufdqtpl9a:n 7gye8l9 6z*oomf ;n8F capacitor are connected in*tl:6ud 67m 8yzon 8iloe9qfngf9a;p 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 inductor, wha/z)wiw cx*+p ut is the impedan upw*+x/ zic)wce 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 the .lx. bfk v,jn9px f9,..lnkvbjhase angle 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 ser0xl7o 51v yjlfies circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 1x0v f 5lol7yj100 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 witr+s q ;xb(elhjsk) j-)h a 100-W resistor and 15-mH coil to get a total impedance of 110 W ab)xeqskls -)jrj;h+(t 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 450-3+s (qf9-6 zqvhd p.n; wagwllmH inductor at 5000 Hz for a total impedance of 400lg;9(6sdqnz.fvwwh3-p +aq l00 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 resistor at 1.0-MHz for yc haewt.z9h.u -4c6 do 95btra total impedance of 14t-cdteryb.hz uc9 .aw6 h95o50 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 connfn 2tapszfiv9;j , :(tected in series with a 20-mF capacitor. What is the impedance at 1000 Hz2 tzif ntf9,(;:p jsva?

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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 serie adib 02yvew65s with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 Wyi6e2bwavd5 0 ?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neoh.yt9 wtk:.yeded in series with a 10-mF capacitor at 1.0 kHz for a phase angothyk 9 :ytw..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 q*ensh (nppc. 7,3wrj with a 30-W resistor at 1.0 kHz for a total impedance of 45 W?q.w*jn(c r,ep7h n3sp

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. W20* ;iju bvl1e,frb0dym/lv-mj*z qo hat is the phase angle0ib;v1mj rulqz/,my0be2v ld**j o- f?

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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 u x 7 evxqr3u7*c;3hra1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in shurxxc*rveq ;a37 3 7ueries?

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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 resist9a2d 5g kyff.yor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power sup9 fgdy f.ya2k5ply. 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 ang 67gt uxew5m4pt*3)oq( pkcb7fs1 uu inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz po7wc)b(4m s uoutf k g3gpx* 7uq6t15epwer 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-W resi;sr:amzpl4jh5wn 6 d. stor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppl.np56a:zrl;w4 hj sdm y?

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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 vs2tkn7rf zl 5 i6c8i8for a phase angle o nk68v8irctf7s l5iz2f $40^{\circ}$ 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 what frequency kxg.8vu i3/es should the circuit be driven in orderi/s u .vx38gek 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 ydv42q +6n)zkviv*uz W inductive reactance, and 10.0 W capacitive reactance, when the circun+dzvi2 vv*z)46 k yuqit 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 x yjaa.jc 4g8b;;6fvsis $63^{\circ}$. 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 :(x i-j 0n 105izv-(beqsu ctodc9lspresistance of 30 W. What is th-u sx1bzc5i0lc(9j-sep0:v n ti (qode 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 f7.plq h6e.ii1k4 psveor a series RLC circuit containing a 50-W resistor, a 10-7v6 .hl4ei1i.pke qpsmF capacitor, and 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 5 8k )d*kiabe*lzu z)ncapacitor and a 15-mH coil in series? 5 dlzke8anb k)u**i)z

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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 capacitlom/(a-2 ron wor for a resonant frequency of 1 -2(mornw/loa0 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 nkfijin mc- z3( ea8-w0eeded in series with a 3.7-mH inductor for a resonant frequency of zw n-ji c efm8(0i3k-a1000 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 mqnm,*j6bw l- 30-W resistor and a 40-mH coil if the resonant frequen- *wmm nj,6blqcy of the circuit is to be 1000 Hz?

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