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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units o go,lb.mf ns1 z,s9r lc19hn0gf magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that04 zgcgu9()yxe 4ay+d -w)nt9uwh wyy 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 prjwcl :lu);kzeod4 g+qodg i:8g5g):coduces what kind of change on the induced 8zlj +oc:geu4 :lkg)) docqw;i :dg5g$emf$, 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 prodo/vf3dc x 9pn-7yvg v*uces what kinddx v-g /vy ocp9*fn37v of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change omd w)y jif*k,6q0 bgb8n the indu*b dbj)08km ig6wy, qfced $emf$, 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 mag/4 yepv)qrjnjr7 z6 c3netic 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 a2 y(ka 7e.uus8*ywzoh1u zlz( n induced current in a conductor will be that which tends to produce which of the kye. (hzu*7wlsuzu8( zyao12following 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 ouj8z+;uefk+u- p - ovvn a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet +z-;- uk8 efp juuvov+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 zt17nxe2;scx8bq urbx.1 aa 2magnet is held above its center with its north pole pointing down, and released. As it approaches the co;aecu7 b21tn .12sxzxrq8xa bil, 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 7m3uwl 2)jwgsft ame( a :ch-.the magnetic field vector points straight up. The magnetic field vanishes suddec-ju 32sa.mfhal(w :g)we7 t mnly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level t;ap.0by 2 l)vqgjn( rtable top in a region where the magnetic 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 c rb0(2pnayql ;g. )vtjoil 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 inw(s hoc+ay+y; a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fi( ych+ayo s;w+eld 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 carridobb4cjg 3hbi1 lt gzzk5e:4:8l u5f 2es an ever-increasing current northward. Two coils of wire lie flat on the tabl 5 k b38g:o jclge:4zbi1btz42dh5ufle, 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 wire with the north pole enterej dg3jef 61 uie;1+ieing first. As the north pole enters the wire, the induced current will be (as gji6ie1ju1e; fd+e3e viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed ab+4mmu .p70gt bce 2;vmyde w)xout an axis whose direction can be varied. In a region where a u m4y.; 7eu2b 0dwm p+)mgextcvniform 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 h yv.)7o 4jdvm:o kzx-at constant angular speed about an axis whose direction can be varied. In a regkv-o4xh z. yjmd)o:7 vion 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.(n bri4msu+m+ 4zfas-
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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 2mgan;go; 4zuv, k9xtk7 gb b0an $emf$ 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. The2gpz9/j)e8eh2q 92dpfk jm ye $emf$ 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 efvgw3gq6 : +ch8hdw 2wast-west direction) is moved northward at constant velocity through a magnetic field that3d8 v :fwwgwh6g2ch +q 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 basn12z*)gwopa/ mnqt 0 r rotates at a constant 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 trans-9-a)i)+ht bl) dwecb zbk2omforms

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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 freq3jpc k+kz i(g9uency of the 9p +g3jci(kz k$emf$ 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 u8s/4x kkb5t xvjqor++sed 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 d svg.hdy2(*sqevice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains mo edh-*tmben 9:jvq;:nre loops than the primary coil then it i: mt9e-e jbd*;qnnvh: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 thdaus-dltx)qq46i2 cu;px u 6mc4f)0xe primary coil contains more loops than the secondary coil thcd l2mxqcuaf )0-6u;uqd4 6xt)ip s4xen 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, thehc7/sj im/zac3kixn5 (cb .a6 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 resonan2unii1 unf oid9+qfk574 *in kt circuit,

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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 seriesdrv0qn2w5f.e b8k+dv2*e 3 xqm.mcw v to an ideal battery of constant terminal voltage. At the 2nf *xdv8+w2.bk 5 rq30vcve w d.qmemmoment 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 battex5 n-jf ez +)v *4rlyry(lk5 b/xi4irhry of constant terminal voltage. At the moment contact is madx/-e4vrjxkl+4yf ) n * rrz y(bi55hlie 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 ind jpkq(0:4o pkhuctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected t4b mp o47mjuu5kkic+ ;o 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 h do3ic*hul7r*-1(tzum 4aoj 15w u tiseries to a battery. The time constanj*t43z 7t(mi r1oo -lhu*h5du1u cwait for the circuit 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 ind(brcocp+k)yn,(c f9k uctor are connected in series to a battery. The battery is suddenly removed from the circuit. The ticbf(pkocr y,) k+9n (cme 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 hrw9.5jubby: i 6 x:yetave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, thk 3 emm/;fu/tn wg/uh2e 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 coh( x9ptguy xac5 6rm*5nnected to an AC power supply. In this circuit, the curren9ry ax5pm(ht5uc g 6x*t

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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 freq;tmmgnl/k/rb 0 g-b3tuency is tri0gbml3 km//gntb r-t;pled?

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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 l v- *u12vuky e5k/3lhlrev* svoltage across an inductor is doubled, the inductive reactance of that indu1ll5vs-leevr*v uk3 yuhk2 */ ctor

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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 anx0:exyckb, 6nq:j * df inductor approaches zero, the inductive reactance of that coily :k,xj0:xc6bf qed *n

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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 kro g ) 3fin2 t+2;.e (xlrr-gayhts,econnected to an AC power supply. In this circuit, the current(e2+,i 2kxs g3gnrfr y-or.e)that l;

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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 vbugp387o y)+qs wc7mthe freque qucp +sw37bm8 gyo)v7ncy 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 across a capacitor approaches zero, the 3wb0u,ekaf + )vzu5n ty0onb y+ss8l4 capacitive reactance of that capacitoru 40o)uaw fk0b8v lt5snsb y nzy+e+,3

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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 onshct w4e.5c4sz+2u the voltages of the inductor and capacitor in a RLC series ut.c nw scs oz+4h245ecircuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defr;:)hqyilf. uined 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 increkzr;t- hy gr dpe+d/3;ases. When is this statemegt dy/zd+ 3 rrhk;e;-pnt 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 circuit increasesk9,;ug32 rom r tfs7ug 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 impedance4 4ag( k5xd/,unmqecs of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doubl, yon qnox 0z/pzmn8.5e in an LRC series circuit, the resonant q5n o80 ,/pzyzom.n nxfrequency 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 circjt wk;zy( t7,ruit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit oc8b8.ry*ol -ogvj ,q+ ifk/le dcurs 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 field9kdfgu)*dj 9p of 0.20 T. Fi) fd9jp ugdk*9nd 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 mjgm,6 fpiso8w ;dx :y:wpk(6f 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 magnetosp:fg86p; w,d wi ( mfk:xj6yic 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 rotatin6ym gbh bzu(f9 hss90-g 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 an(6u9bm- 9shsbh yz0fggle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced ff1 kftvce/vw yl2-bx x/ml3c*ywf+ v+4t g-- prom $1.0 \; m^{2}$ 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 qsmd /+m(5v ;5qgmdwt $4.0 \times 10^{-5} \; Wb$ 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 sidn zz2e;bf2rg4es 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly frofr bze gn2z4;2m 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 and an )u;j9mx6 hu3cbeabh/ 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 a)z)*dzp ,4y 7ku h7cnjld/et trea $0.20 \; m^{2}$ 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 9a9-owanvw8rr-jx*ppb- tqs 8l 8q8s span of 60 m flies horizontally at a location where the 8 r- l-q* wan9r8tov9q88spsp-wxjbadownward component of the 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(a) hn1 jvio3a that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a const3(av1j) oihn aant 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-sectional7h0cp av4*-nmfj wnm4 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 ft;/n cvzts (t6 ,gub;turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops og*axr:l -bx1mn its armature. 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-amr1 x*: lbgx, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of aref yjrsg-,3/8( cxhswea $0.090 \; m^{2}$ 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 withm05-p;dt uck ax5a* zj an output of 12 V maximum when rotated at 60 Hz. A magnetic field o;kjx*u 5tc-aa 50zdmpf 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 qplg4*x on x2r t/yv9+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 haveiuka.wiox 5f8x/1z7 b a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 /lrb4 z7u+( xzutj5xhwxps0uc8 rr+a) q h)7cW. The motor operates on 120 V AC, and when running at full speed it generates a bacprujr(lxb8574tshawzx)+z0qxu/ r c h+ 7u) ck $emf$ 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 to a 24-V power/l+wbhv0wn-a 6onh) d supply. The operating currenb-/6) nh a 0vww+dhlnot 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 resistance 6.0 W is connected to a 2om+rq y (t2 6wgqn)h/f4-V power supply. The operating current is 1.0 A at full speed. What is(q qnf/whom ty62 r+g) 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 connyy*bk.mioy6v 6 )8gq nected to a 24-V power supply. The operating current is 1.0 A at full speed. What68oy givb* )kqnm.yy6 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 kmzlb+5rb;n9n)qxc8dv 1v(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 primary of a transformer causes 14 A to flow in the second(zbr;,njb33fhw5d *fjsd7b aary. How many turns are i(,w5fjsf3 bzjdd b;7hb 3ra*n n 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 ar95x6cyb *mbb* pgkgt*e necessary in a 110-V primary if the 24-V secondary hab tk*p 9 *b5*g6ybcgxms 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn s zl; etg*i4 m-94gcuwiecondary coil. If the current in the secondary is 3.0 A,;izce*w94l-4 t ggumi 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 trkb mull(751bedq s(.mansformer. Assuming 100% efficiency, how bu q5 b1kelds(mm(l .7many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The r p ithb)8:;whprimary coil h)bi8 wt:h;pr operates on 120 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 60 turns on its primary coil and 300 turnvvf mcli:6.o ou+t2yk )x8vh.s on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondaucvvhmvt.)+k.6xlof82 io:yry?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns oehm7y3 :qv (o hd-wbe y:hsg(hkv54:o n its secondary coil. If 120 V 5m kyhqo ( 4hv-3h:bg:ho(yd:w7 eev sat 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary h ecs77q.m 73wwng,9jx0 eeire as 200 turns. If the input current at the primary is 100 A, we can expe e ms x.r7wwg0e3 ni9c7,j7qeect 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 xin-k ao,exx)8,mu 0 hturns. If the inpu-0x u,,ak enm o8xhi)xt voltage to the primary 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 secp9oka7+f n ;roondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondarynp7;afr o+ko9 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. Thqfyrj k7 kcmf 8.q2l8,ag 4bf4e 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 ifk 8 ffy lg,jm72.q4 f4bcqkr8a 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 7)nksd,q+5lq f b;fqp 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. Filnqb 5q ,kf7dq;p+)sf nd the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current ato.pea y,w ;g4w 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tot e ;wpy4g,w.oaal resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. k beapyk; xa9s* 1 nd4:1wpr.qA 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 p;abkypsxw1. 4d nk*: q1ear9100:1. 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 transmissionab8lr)o9 04r/kkvg yd s *ujw7 line 50 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, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of th g/9vu)rk8js *w7akl0 dr4boye 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 be 9 i9a,us8vxe,wwt xh6lost if th8 ,hxsew9,i9uvxt 6wa e 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 A2 auu3eoh7 2te. It is to be transmitted on a line with resistance of 0.60 W. To what voltag 2 eoteu2ha7u3e 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 current of 5.0 A. How much energy is storedqhr*br20x ;vq in the coil's ;2*0x hqvrrbqmagnetic 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 resistopf4 k++d,ocl sr and an 18-H inductor. What is this circuit's time const 4s,lfp+c okd+ant?

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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 rmsro/k*e. ,gc*1pcavqb 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 intmd q(0 jf:zjh8o 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 obq 7;twre(mq3 h:rpm7(t we *tutlet. What is the resistance of the lampw:q(tq73 pe7r tmeh* bmrt;w(?

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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 connecteg1zdz(ad82b dd to a 120-V ac power supply. What is the peak current through tb8zg1zd(2d dahe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. ., ypc(-tbcvw What is the power dissipated,-ycpvt.cb ( w in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rrr cv8v a4g7+er sh9f,esistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist zajnzkldt8 dw5zc 4m. 0z20+for 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 reszpohzh .1-bn2e;3jxy istor 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 i(2gl wn3t2/di)2t u fd gasj0inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 100o:zd(;(wmmdwf *k 05 dxwx e6x0 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 induct q31aa : x6fo+w1dbmhyp3/ax,c nlmp2ive 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 inductive reac f5vw .8o-ioegr: td51u)z :jszj,njutance 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-me 0njsk7bk2obl7 g--l H inductor when 120 V AC at a frequency of 20 kHz is applied lk g lb7-j se2-k7nbo0to 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 ctc1(haswo4arkac ( m:7* if2toil 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 rcm *kp)wy 1yt(eactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at f*h5v : .:cit/xthezv 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a react7jpa p8;eteq1i2 8jqq :ct vh)ance 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 capaci4v48 kxn1ppb utive reactance of a 0.010-mF capacitor be 100 W?8nxbv44p1 p uk

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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 twb.u2 o2deauchbxbd23z n2 /0hrough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series cie/+i p:aewm2e i-5su krcuit with 12.0 W resistance, 15.0 W inductive reactance+k 2a:sweuee 5pmi/i-, 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 co. 6b1m n m( **ykjzo4qepmwg5fil, and 1.0-mF capacitor are conne6jqof pw *.myme451*bn(zmk gcted 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 +u1t(mot) sanpe/o2z mn 9 4mkHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitortne1omn (ptka+ms2/9mz4 ) uo are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the *,h xp1cjijp2:rd w01k /gp8x)st f unimpedance at 1c0j2 / ir:kx*xwthuf) gjp 1pns,d8p 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 isr+ ;(d 2(krtw,c nsrlzx46 hwd the phase angle at 1000 w4hnwkxlr (rddrc+;2 ,st (z6Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil ks y0n56qp) bxand 1.0-mF capacitor for a totalsxp5b 6 0qny)k 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 followingf+my iy9d .f+sa0qwq*rk) y2 g capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedancedrygswf)q 2. f ay*q9+i my0k+ of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with* wd2hbw1 wn-q a 450-mH inductor at 5000 Hz for a total impd qhwb wwn-2*1edance 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 i 37rc kpjl-a:bb0ma-pn series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kjrkbp:37paaml--c 0bW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is til u/*h:vpxgn, koi+j7 i5,xfhe impedo7u 5:l fpk+gi/i,vix,j n*xhance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needezl1+3thle3y8zpuy 2 cd in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 4 y8zh23 l1cyt u+pz3el5 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 szpani39; up0 series with a 10-mF capacitor at 1.0 kHz for a phasi 3aspu0p9;zn e 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 in series with a 30-W resistor at 1.0 kHz for a q47mbi 7 pvx a7hu2hrv; *x8yptotal impedan 7 7pu;4 8vbiqrhx yh*mpavx27ce 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 series with a 100-mF caplg4.:y8s).c woa c )x3lbdwxs acitor at 120 Hz. What is the phase y)3c.g :a 8lx4sowc w.)sbdxlangle?

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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 resic3zoc s3-v8pejq/26w m hv/m nstor, 20-mH coil, and 1.0-mF capacitor are cone3wvo/ csz/v68h-m2 jc3mnpq nected 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 t.s (pnvk)ot *of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H induto*p s k(vtn.)ctor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capac6q-ko qzbzg* r62gc4b itor of capacitive reactance 30 W, and an inductor of inductive reactz z6 g6*-2gkbcqbr q4oance 30 W are connected in series 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 .er (a- pofvn(a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup -vpe (.ronfa(ply?

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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 a9v:ybbk10ccwpcod(;5h g3 3w ;uddfaeq6,wj ngle of : ;du9dega1vpcwq,h6jbdbyw;5(f0c3c owk3 $40^{\circ}$ 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 = fo ny-oaki(-t (y ./qp20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuq yy--o.pi(an/k(fto it be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resl5w3kdk3 m mpqqx9: )5odd2ujcsio/*istance, 15.0 W inductive reactance*q 5m3/osw d3pdiqx :uj2k mdc5l)ok9, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit a5lqg.. jra7 nis $63^{\circ}$. 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 resistancr 0m yzb7k2l,6 w n(lj4wbo+wse of 30 W. What is wbrm(k+yzs,owl7 bwln60j42 the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 5051(r2ztksfzz,/ fj vj -W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectesk j(5fft vz21z/,jrzd 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 .g wc td8mu;3xz(r .fy1.0-mF capacitor and a 15-mH coil in series? xm.g3 .czrft;u8d (yw

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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 capacitor for a resonan hrxnu,s0e(2mt frequen( ,mhxnue r2s0cy 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 inductor for a resonant j/gd pks(0 wrvv;zd2; frequency of 1000 H;wvp(;rdvjkgd 02 / zsz?

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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 resistob1 l 1gb,yjyzci.w8 b-r and a 40-mH coil if the resonant frequency o-jb1zwcb1l g8,. yi ybf the circuit is to be 1000 Hz?

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