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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 m6q5bak3 zzs 3(mch,ta8il4 jdagnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction stateshl cl8xk d n 4.fvwp,mcz**f bn.kg4z;)ix,- p 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 coilp0xc wsa-ic(j 7 4uk m5oe)/zw produces what kind of change on the inmuz(0eic swpa)5w/cko - x4j7duced $emf$, 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 through a loop of wire produce1k*/)ipfapmcx y nbnpo(279 qij78xy s what kind of change on the induced7xiyc8(1)2yk nao jm 9nfi7p/p*pq bx $emf$, 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 proe qu0 k((rwfsyvfj,y 2/7u7 seduces what kind of change on the induce(u kf,y7q wyv (fre 2s/u70sjed $emf$, 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 frro2 kkv4t4jjq9 )ej .aom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an indj)7qr1zg1bwben z h+r+hg,5quced current in a conductor will be that which tends to produce which of the follo171je)w hhrbz,zq5+nqgrg+b wing 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 he zohf-8r eh)e/ld above its center with its north pole pointing down. The /rz ) 8ho-hefestationary 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 horizont 1 kz7lzrwenmj ksp4. l8y)0r4al table. A bar magnet is held above its center with its nor10r r 74wz.ms nyl8j)ekzp4 klth 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 kr00y( ;ahxol the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from;or 0y(k0 xhla 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 magnetic fievvj c ) *xhy5)sb9xfj5ld 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 5 v 95jjx*yf b)sh)vcxthe 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 rji +c2rf+cj n.egion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction cf2j+ r+cnj .iof 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 liip /y jfekq7v1u 2i-k5es on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on k-pje7q kuvyi2i5f1/ 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 wire withnooi+0 0oz*7h-cx whmg-syg 4 the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abo icy4 on z0w70o-gohhg-m+ *xsve)

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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 at om4:ixp)3g en 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 rotatiog) xti e43pm:on 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 3j7-qrnrd*q vd f; e*bat constant angular speed about an axis whose direction can be vdr7* vf; d*rb3j- nqeqaried. 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 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.w9y c uqwxe:b7.z 7a*gs /r7dye8phti0t :le5
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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 th72ax8y6hweema y p:6ji)pf 2sat 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 maico7 8xzh u :pgr6z3 aq(5ouhq)7y b(ggnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is m 2lx d*)nxy.mmoved northward at constant velocity through a magnetic nymmd*2lxx. ) 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 const3*yc (02i 21bl /e4dvp( gzrgq pfpudkant 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 t.c3(sv dr)kcgransforms

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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 frequency of t (: qvnbwozaf: r05co.he :zc.ob5( v:0nw oafqr$emf$ 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 devicezps.kd.sq2l 6ho-zmm7,7zeu used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thac fkxb1w +x.7yt

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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 c7sgznd e l..q2d f/l,doil then it isdq/.l2zedn7 gl, df.s 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 contain -ls,+xwm*yp :mb3 qdks more loops than the secondary coil w b*x,+pmsl yq m-kd:3then 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, thebqff *, l4qjh+ power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuitpu6/jdz aim40i6) )b mfe5 uft,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of duzqt6b /s+t 0constant terminal voltage. At the moment contact is made with the battery, the voltage across the stqtd6+bu 0 z/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 p1x(kz g,x o risv91bs;/z0uzbattery of constant terminal voltage. pgsz; 19 iuxzb/skr0z o(1xv, 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 g+ kngk9aj. 3mis connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connj7d+/ wtyjc(z ected 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 *2zruaieb7 h 5connected in series to a battery. The time constant for the circuit represents the time required for the ce5h b2ua rz*i7urrent 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 uqrug td:s3w.9., r/rt0xmc k are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuitm xtqukc,rdt0gr/ur .w:s 9.3 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.ie t)rb33mv0g 4ap hs except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On thrnh n:6 6qxplo.b*eh9is 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 cirlp m),o. c/esqcuit, the currenc,lp o./sq )emt

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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 qi-ry 6bp7x/t-bx;sr what factor when the frequenxprbts xrb-iqy7-;6 /cy is tripled?

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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 anrrij dvst//h w ,bp*77 inductor is doubled, the inductive reactance of th vhtji//*,7w rs7dprbat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor appro1 art*cva odz sf,s80g2ir-2maches zero, the inductive reacta f1i8ssd- *,v 2ztgcoa 0rarm2nce 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. In4 d519r4tk(,h n5llki pi amhg this circuit, the curren4 pg5k5ri1(ml a9t ,lh4dnhik t

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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 whenz ( 0ok8beq1d vrd/j4a the frequency 1dq d /a8ebko(0z rjv4is 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 acrosskd+bf 7*0y rzs a capacitor approaches zero, the capacitive reactance of that capacif 7dzs r0+y*bktor

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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 be dgo i8dqi,t/klv0 gou*+r6*z2hnr 0m tween the voltages of the inductor and capacitor in a RLC series cir0* g*6urq8 dz0,gt2 +di/molkhnio rvcuit?

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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 anqk w(, q)6odtu7 j abvwq ,1d5iu.5 fpx-zlr;j RLC 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 the circuit increases if R increab -w1z61ap zjhfq+g5o ses. When is this statementhfaw6zq1 p1-bzj5+ og 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. Thed)f. dqrmjhw )t39cl( 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 series circuit. The impedance of the circuita,w:l r-ps 5o:ahjd3pv1/ hp0b wvg9t 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 seriej.t t 8mei:xq7emj:i;s circuit, the resonant frequency of that circuiti 7x: ei tq.j;mmej8:t will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonz)f*r h7 rwx3pance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs wha.qj9yughuj0eu i5 6j, 5:oipen

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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 uniflud1sne b1e dah(v-7vi6v3)rorm magnetic field of 0.20 T. Fiv1lvrbdh( deu -v ) 1sa6eni37nd the magnetic flux through 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 roat f/nsxotz ;qfm06* h +d,mqw e:hd,6tating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thewmxdf:/ qsed*,z; hqthn o60f6+am t, loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field owy jwjxuq 9 m3*,r2bj y/j;q2vf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at bmw,;vq9qrjy2jy2 j/u*xw3jan 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 ao/ :elb6 p;eb;4qs evyn adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from mz -ec4h8 u4oc$4.0 \times 10^{-5} \; Wb$ 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 y8k)wcu+rnc 1y (psbicx 63i hrq2yj1x f- 7i)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, fih 1 c-icqyxr3 +ikfcy)rys6)wx8jun(p 7i 21bnd 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 1lm(p dk3ss.e ,5 turns 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 (y1qcf(9vb ip area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location wherep*g-ql g i.t0k the downward component of th kpt-*liq 0.gge Earth'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 angular veloi8q q8akhmy7 i uc,4)tcity of 2.0 rad/s about a vertical axis through one of its ends q8iat )7chu8,qikm 4y while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sexaqfa/nt tlo4t+u8 fjpv;82 ysz6(+cctional 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 tur+r rmzgk16jrg4ns: m ug/lf10ns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each lokjpy )6;p6p(jxd bk1 wop 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 06( k pjbj)dp 1p6yxw;k.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 turn:pmqg:jjtbus(0bmw 2 4l f0;*5g an tus 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 a simple AC generator wit y)141nw lnsmqqu ysk) 1p*qv,h 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 rotating coil i)qw1l1pqy41s*nvmn, yu s) q ks $100 \; cm^{2}$, 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 aet*dlu* xj/u 3 +ue;pk 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 6.00x/vyn6 4.bewaz74vuy 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 bxgn/ ns rqelvpuu)84r ;f,)s6n1 p;m have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it gener mr))8n np4 vqx;uf/e;s6r1,ngp ulb sates 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 co; ft, wf9pj e99zetp3knnected to a 24-V power supply. The et j tep;kfzf939 w9,poperating 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 re;)d (5dfcrh myn/ g,lhsistance 6.0 W is connected to a 24-V power supply. The operating current5(rmlcf hgy/h, d;d n) 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 ceiv/ z(bs(2b4x9fs;np9* m8j e q cmgresistance 6.0 W is connected to a 24-V power supply. The operating current is (bjpqm2 emn*9c9f/ 84xz;scvb g(eis1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a pr7: +pm1*xpcjtlx-wk vimary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the pzw( p;zj 6*u9b.kmrosecondary. How many turns are in the seconz6o(urz*. ppjb ;9kmw dary?

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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 .y9.:h brll9phy: t tlnecessary in a 110-V primary if the 24-V secondary has 10r :y9:y..pt lb9tlhl h0 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 prima0* 9t ;y4vgfazfblgzdgmb7rs4 eu( 68ry coil and a 2000-turn secondary coil. If the cur9 g ;gztd47flrae8gy b 0sv(zu64b* mfrent 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 tu;4 k g n-00 zpt9fzbuo 0uxw45rpu(gmhe primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seconbpg pu0 4uro0g wzktfz m-nxu5;0u4( 9dary?

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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 10.0 mA. jjck-)kxi-5ayp.lco i+0hw3t )c2 mq The primary coil operates on 120)i+ lpwxckykt.cc5j 0iqh2jm)oa3 -- V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 6rke s1+bq- rj.3o1g3utqlc4w0 turns on its primary coil and 300 turns on its secondat3 +kwr.bs co-1j queg13r4 qlry coil. If 120 V at 2.0 A is applied 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 has 60 t*5acr0*2k)wcoyz sk zurns 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 presentc*r*5wy0a kz zcks)o2 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 hpw .c- o+ y3+efvx+arcas 200 turns. If the input current at the primary is 100 A, we can expect the output++y+wvpc .oac-x 3rfe 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 turnmf* fvvc whb/q+:- c9zs. If the input voltage to the primary is 100 V, we can expect the output voltaghw+/c 9zm* v:vc-bqffe 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 al77 i +evw8uuynd its secondary has 200 turns. If the povwu+7 7l ei8uywer input to the primary is 100 W, we 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. .c c ot.u3et1xThe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power exuto .13cc.tline of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of ywoxo n8azf2o 6c y6so8(/o, mcurrent 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 the transmiss/8cn6o oof zy,m2a6(yoos8 xwion 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. al7p1(+hfb tp b t/3;l/r ixplThe 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 the transmission line if the voltage is not srb xpifl (l1a/3ph+7 bt/; plttepped 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. A6dkscp6,.ve kbla(l 2 generator produces 100 V at 70 A. In order to rp sl 2(vk.e6cb,lk6adeduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a totg,os blyq./ ;qal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the orig. oqys;qbl,g/inal 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 li(v kj*d q,y938uthgk+ ab,+tx muqjo )ne at 1000 V. How much less power would be lost if the power were transm j+* qka)mgo td(vyhu, u+kj9qb83,txitted 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 trans:pmsn43 v)5fpqko i -dmitted on a line with resistance of 0.60 W. To what voltage must thio -svqp3:kmn d)fp54 e 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 current 3 2a6rn*josaawr.0f0bb d+l dof 5.0 A. How much energy is stored in the coil's magnetirw*. 6da+n0 aorjad2f3 b0bslc 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 resisol 3a p;.w: v5wcf1pkmtor and an 18-H inductor. What is this circuipwfvk 3ap :ol w;5.1cmt'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 anh;,(94jjlhoymzza s.g+x0 goh 4; cmo 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 ou qwvbz21o 2db.:6sfaxpg:3twtlet. 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 placei(cf54i o sxg/oiw /x2d into a 120-V AC outlet. What is the resistance of the lam//25ifx x igsc 4woio(p?

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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 cs;) a ec q h5 275izqx.-j/lfqx;jzmiponnected to a 120-V ac power supply. What is the peak current through the csf2 zimhie-; x75)lx;q/ j.j5 qapzqresistor?

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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 t+ dwv:j8di 5zoo a 120-V ac power supply. What is the power dissipated in +zv j85dd:w oithe resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is qp1*mrc6 o8ij) j*rah $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W owiw lse*n/-/l7 guh7wn3*tk 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 506x7cz;j ) zcz9tymlv 5-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 of a 1.0-mH inductos*ppyh+, mhhx5s.g:8tvhc -0gy n1xz r 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-mi / +m(au gvcaqr7ruw3ovf2n+6 fx1: dH 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 t).xz:g )lr ded9rc9z+(7c of ytj ,rhreactance?

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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 inductive reactance at 1mbi tt ,,3b5s: jfrgy- j),ejp000 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 120bcqyrg6jw5, kgnj).xtmz8 g mlf-,)lar/2- a V AC at a frequency of 20 kHz is appliexgln/5-q l.r)z mt82,jgfa g,w)-y a6cjkr bmd 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 1 xalyb9kl)/a 7lne.4f ck89nk10-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 kHzqwp4lnbx ,) 0i?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor i . -8 cdq,rmg+rte3at0ocg*aes needed 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 : qmz4pki ;;m ew7ht3a10-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 the capaci7-2n)5lqw2tqc d qa iftive reactance of a 0.010-mF capacitor be 100 W?t) q7dwi aqc52ln q-f2

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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 capacizps7;)7 syqnk4lwrwkc:s5) gr i- q2htor 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 wit23 i 93drj7pg7cnrea;k(l5anlc 4r obh 12.0 W resistance, 15.0 W inductive reactance, 9ecj2r b d 3a7ilgnon4r(7karlp 3;c5and 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 resf06vo3d /ub f vq0mtk8qexjk9 j**zk:istor, 20-mH coil, and 1.0-mF capkqd/m 0j z83*ekfov v0f 6b9q :ukj*xtacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle atfjua.1 7,3wbz w9m f:s5p snsd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co53udj1wswzs : anpf sm,.f7b9nnected 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 20-6u1ltc1zy b)g mH inductor, what is the impedance atgy 1tl1)bcu6 z 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 ijzm w92dyal tae2 4qf(y d(+6yn series with a 20-mH inductor, what is the phase angle at24 d 6m(t+y awd lj9q(yezyf2a 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-r4 t0o+ f+i adf)s3hjrmH coil and 1.0-mF capacitor for ara+fs+ 3ij ft)0od hr4 total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances * /i(fuczu*-7 1nrfv a- lo-w,iv laepis needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110z,l rol1*i au7n- --u/cap(fwvivef * 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 induyruc+xr7nedw6se9: tc+3 ,(9una sii ctor at 5000 Hz for a total impedance stcr ec,(x+si+73ar u9y:9ew nnu6i d 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 100-kW resistor at 1.0-MHz for avly.knb3aj;l*y+r 6v5cj6 b op+6 tov total impedance ofbn + a+c;klb6j6vvt.yrpl oojv 653 y* 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitorlib ip4 2e fkn6-rg +;0ysyf1s. What is the impedance at 1000 Hzs06y4i1ni-2ffb kl gy;sre +p ?

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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-modq;79o . m//dyohunea) b0skF capacitor at 1.0 kHz for a total impedan// sa noqyd b)ok7;u0hod e9m.ce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cap1gao qmmj /ma*da7lmc hv:1( 8acitor at 1.0 kHz for a phase agam1mc87j/mhm:o*(a da qv l1 ngle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at b/wsz*f qrv)- 1.0 kHz for a total impedance of 4vs -br*/wq)z f5 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the 5mds(y6a0h myqb+.ae phase angle0 +5qhyda by .6(aesmm?

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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 1.0 uf 0q0lw8s: x0c1izn+qwins/ -mF caps81lni +cq u0iwwz0q0 :s/xfnacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit conf1+3*8 pih+xg p sc;s,bgtqvrsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the ci3+bp,vhps gq+sr *1; 8gtcx ifrcuit?

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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 cap/69yu g2c +7iftsrsm00 h ;sx 3aeaucbacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in seriea6utcig2b0+mfhse as/ xr9u0 s73 ; cys 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 serie* tph+*c6a ,tsymdjr0 s RLC circuit containing a 50-W resistor, a 10-mFty 6,*am+ *jtshr cpd0 capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessar5gjgs z, wwf;7) ,z*n6unecoqy in series with a 500-W resistor for a phase angle ogj7nq 5*;z fwuw)so c ,g,z6nef $40^{\circ}$ 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 = ;o4bdegc,o 6+7b tr w0jp e2uv200-mH, C = 10.0 mF. At what frequency should thepev6b; 072jdgb ot4oc,u e+rw circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output:c rgdhucam x7(s+pb z; jm565 in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?m6u;:xdg mh( c+j srzp a55bc7

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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 azpn :b*k 2zotg gqh18f*xgq2 uw0/+ncircuit 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 resistanattrn6b 6wn( vn h0.k4ce of 30 W. What is the power f6vna tbh (60n4nwtrk.actor?

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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 lz5dy6 4l6f. zm3q.nzu;6xmmrz +xymseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whe;zq lmyfm. .yul6d zzx6+364mr5nxm zn 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 capacxhuwhx5 +a7l-itor and a 15-mH coil in series?a-xl7wuh h +5x

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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 witx 4us llzu*e) 9v4b;uhh a 4.7-mF capacitor for a resonant frequency of 14x)4 9sb;l*zvlh uuue 0 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 inductor for a resonant frexqpr 7, c:sui6:1lg cdquency ofr,c7 6:sqldx1giup:c 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must ber 1zr- ohsdd+mylpo/2u e,b3 vuvs/9 3 placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circurl/d2moe,d u-33s/bvv 9 ry1poz+hs uit is to be 1000 Hz?

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