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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 o r/3gk2/w cuszf 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 that9m dix f*ck)gy;n1h(e 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 we/ ux5( cbp rd:jpm+jusb7;b0hat kind of change on th;dj:m+u xu7pc/j b05(bprbs ee 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 magnetic field through a loop of wirqy6mlby gt *f6v, 8w4ae produces what kind of ch*8a64m,qy fybvt 6g lwange 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 produc)s0g1lpi0biszm -; tdes what kind of change on the inductp g;il1i0s zm- )dsb0ed $emf$, 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 macwrj3u,+ua86kpd a.o 5u. mph gnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced cun0ia mrv+8c31kxjh0r rrent in a conductor will be that which tends to prcr3 0a0 m r+xivj8knh1oduce 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 horizontal table. A bar magnet is pyq f2ojt :k0hh/+fd:held above its center with its north pole pointing down. The stationary magnet in0k h 2yph+f:/jdtq: foduces (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 h 82ve1 h+6nq-r kx 3:bcjmoseporizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, te2: sj1rb qcp8e kxnm-6+vo3hhe 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 pj qrb yg6xh lu;9a1fx:3s)1q region where the magnetic field vector points straight up. The magnetic field vanishes sudx;1f6 sal)rph9by 3qjx:g1 q udenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field 02o 1dc; cqgrivector points straight up. The magnetic field suddenly grows stronger. When dc g0co1q;2riviewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tabljwg(yxb 614tqa2 v.2 wqljt/le top in a region where the magnetic field points straight down. The magnetic fgq4bv2l (.wqwt1aj2t lx/yj6ield disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies oc* g lgzw3w+9dn a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When glwzcd9+w3 *gviewed 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 entering firstct6n 0ynq/w l+jvp+ 3d. As the north t+wnjdlqpc06+3 v/n ypole enters the wire, the induced current will be (as 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 de gsx-/e s+3jo5bow, is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points st/woesoe jb +x, 53sg-draight 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 spew( ecpa0c;)ncig75 r bed about an axis whose dir ;0cbi(ccn 7pw5erga )ection 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 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.ph:+ebolu m5kdsmw d+uyen*3b7*h) :
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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 hm( k vd8qa8am4j 0jeqr l3awqj0)3o:that an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. 9u i0wx5ld6e2 i6qt me 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 directionpdnk-, auvexh 9-h5* a) is moved northward at constant velocity through a magnetic field that points straigh h 5p-aexn-d*ukv9ha,t 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 8e8h3o n hr/tjconstant 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 transfo:o9et su/,wjqrms

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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 secondvv1rm9 sbz69 d. The frequency of t9 vv9rd61z smbhe $emf$ 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 trce.bzq ik0 +,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 g.gt v+xd+:l aw++bzi 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 secondar wy2; xsli +-l vd;/zugxlcc,*vyltigv+9.8py coil contains more loops than the primary coil then itl;+y+xld/vvszcl8 cx-il v, g wt i.9y*;upg2 is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil cq il*a4o6x ukup:tf77ontains more loops than the secondary coil then it is al7kq*fp6 4o a7tx uui:

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, theidhde.b 6g2 h) 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 egsf,l*x d d 9w bq:rv)0:nk nf)ac.6ccircuit,

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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 ba(ycy1p fprd; ( r-5ejcttery of constant terminal voltage. At the moment contact is mayd1r (;p- pjf(ycerc5de 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 (cb9llzl pc4h3 t5,i/ktn y .rconnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thcc,ylt 35ik.rlz9n (/plht b4e 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 connected to an,k06.jw0k yv /enktp mi.nw/ x $emf$. 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 inductancmu,ya a7 0 n3nca.phd9e L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The timehk4y x4:5qs ok constant for the circuit represents the time required for the xk:k 5ho4s q4ycurrent 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 in yl7ofl+vw1:k3so c-y ductor are connected in series 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 deo:c3lysvow7k lf +y 1-crease 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 rotoiczb, xrj,n5 3 0tqiox6vg5o0 ) 2have 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, the cu.p*ew*a b mkp7rrent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the c1j e rzho+r*v8urren +z1 revjho8r*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 w: ;:ze pe(aok3kro z+yhen the frequenc3y:( r+o a;keoe kpz:zy 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 an i2.*jic hzm,t 5wdfe 7pnductor is doubled, the inductive reactance of thath 7imz.c5 w,jfpe2d t* 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 i.x: +meq47xkxputr1fsq l*u,nductor approaches zero, the inductiv ,*1+mr u.esk7x x4qqxtlupf: e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC ph ; y)z8ztwg zl ii,h8(e )x)dgxg-oq)ower supply. In this circuit, the curreh-d )zte)oig8gz))( lg8i hxyxz, wq;nt

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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 chj-9a h- hqar(panges by what factor when the frequea rjq-a-(hh9pncy 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 eytd.x3e-0w bid.-ih a capacitor approaches zero, the capacitive reacxdew-d.30 y t h-ibei.tance 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 of3vck9 nov7- wa the inductor and capacitor in a RLC series circuit?ovk9 -7vacnw3

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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 cirx-1cj7(eg(uwc i ev mw bh:xp;u/:7ap cuit 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 t3 tvhl7w1ifv/he circuit increases if R increases. When is this statem7 13i/t fwvhlvent 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 imp m,p*sjikh:*5mi;hk d edance 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 circuit increases if +huk07a;w 7 j.b/jwc. udv6,ab 2;cudjgb jba$X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, thzucnl-d2wta+z bqa765lc / b/ e resonant frequ w+ z b5z/7qaubtcl-dnla/c62ency 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 is driven by an AC applied voltage. ;t2zb j 6ey-:hc y**wmjsrd p-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 occqr1p q0 tflhi t:.9va1urs 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 fiy ab y/) rq/ 8t5lnft/(k9kihxeld of 0.20 T. Find th9 l iy(/q/ybr5fka)kh 8tnxt/ e 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 rotating in a uniform magneto5uu t ts65t st5gj6:tic field of 0.20 T. Find the mas6 tg5tt 55stuo6ju t:gnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field d qr1qm9aih(*fa((u eof 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fieaq(1 *hqefia(m 9r(ud ld vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustikw9yf0 c xbz(x)u0u3q gay9. able 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 fro1 pntws:gj7) 6ly7obs m $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. q4mz vgz.kcr 1sx: 13x A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniforml4 v11 qxm.3kzcrx:sgzy from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and n v.7ty5t0k tian 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 an7c18savu8.tu) s13r tissdyj d 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 ablnz5 . hzwe)3t a location where the downward componentnb wl3z.)5ehz 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 that is 2.0 m long rotates lq*yf(bl gyvb ;3p2qllr1,n. at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its e l1.rgl, yy32bq pn ;lf*q(vlbnds 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 axr8 *0 zsv)8t zr3adls1d:hpend a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area 2tpn g965xrha $0.090 \; m^{2}$ 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 8 tqmm (znm x57y0ny;w;0 rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armaturztqx (;;ymnmywm7n 05e rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area tdlux( c9k-s0 y, 08i8fdv etn$0.090 \; m^{2}$ 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 constzq x+ *w- wjg 6nljs0vi1flg326tad)l ruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. I3- gzgdillx v)st wqjj l06+ f2*1wa6nf 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 generatorjmc3 pqi:n *- 9tm,ffp with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Tz*6radks.94;3j 1o)il n pfzayup2 gihe 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 resista13jsl ekt7n 4snce of 6.00 W. The motor operates on 120 V AC, and when running at full spe ek4s1n 3lts7jed 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 to a 24-V power sna6p6zp8 y ,i o7q bp1j,hz:xyupply. The opezh pz8oj6b7,ay6pyn 1iq ,:pxrating 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 resistance 6.0 W is connecta* g8-d kldq5ked to a 24-V power supply. The operating cu*l -q8dakgkd5rrent 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-u1 i lu/) ,84zd,eq6f a cqxnkb*)zvdaV power supply. The operating cuauv,),*x /e)anzbu1fqi k 6 8ql4cddzrrent is 1.0 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 primary voltapa** l;ope l.gge 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) pep a32.bf+ nix xfdi4j79ae a transformer causes 14 A to flow in the secondary. How many turns are in the secon) p24i7e xf jbdxie3 a+9fpa.ndary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if 6g)xm;u1s )wccj gt/t the 24-V seug m )1) 6t/ws;cjgctxcondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil anwmf: y03evbe8 d a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prmfbe3vew 80:y imary?

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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 primarpr xicv4;u++ ny of a transformer. Assuming 100% efficiency, how maxr u+c4npv ;i+ny 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+q. qoh 5x,jve bk1( 5awvqd6h sign transformer provides 7500 V at 10.0 mA. The primary coievo.qj5bxq6v q 1hdw ha5k+ ,(l 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 turns mp fj .aon8o-, ur)o6lon its secondary coil. If 120 V at 2.0 A is applied to the primary, what p 6.- anm o)uofo,j8rlvoltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on itsl448 ,ul tiepj secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary,l48tli4 ep ju?

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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 hasile/hnb hw*- x dl.80a 200 turns. If the iw/ i xn-helh 0.bla8*dnput current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 e.y*kcdzja9 2c3p s6hturns. If the in e6yk .c*cdpsj9h2 az3put 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 secondary has 200 turns. If n tsnur90: lttbk(b0u) 2z*a fthe power input to the primary is 100 W, we can expect the power output of the secbr9n) 0n0t2ttkal* uu(:bsfz ondary 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 curreo9;+tsp b;/sn h8qui int at 120 V. The voltage is usually stepped up to 4500 V bytn;ssu9 h io 8pi;q+b/ a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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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 vo5.wytrh0q f63gkq8v dltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.5rq v8w6tgq3 h0.ydfk0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppltj lv)/y v8xll 98m*red up to 4500 V by a transformer and transmitted through a power line of total resistanrm*jl l9v )xvt8l8/ly ce 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 titukkm b f)byi/4u; 7:otal 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 ori;k/)i kmt f7:uib buy4ginal 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)pzzrsm-3,vvb:) rg n 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.bzm psr g,)v-3r)vnz: What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a+zpy- tv2d2 )9by mxrss f5li7 6-W line at 1000 V. How much less power would be lost if the power were transmitted at+xy7dmrilyp 5t-2 s) 9b 2fvzs 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. a1cymerw0nn9ek9m/ 8It is to be transmitted on a line with resistance ofa0/c1 y9nkwmm 89ee rn 0.60 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 current of 5.0 A. How much energy is stor8 w viald6 th51i-lj7oed in the coil'sjiv-i68ol 1l t7h 5awd magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit conta1htf 5ag5ci;,t u- b :)clxnpmins a 6.0-W resistor and an 18-H inductor. What is this circuit c5 tai:mpcgubxn);t -l5f,1 h'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 whersaktf8.jgukfx ua9s9t , .o- .e 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 outle .* :ohqpvg)zvt. 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-bp l0w x4c2y4 h5zvu-uV AC outlet. What is the resistance of the lamp5z40hy 2lvwxpu-bu4 c?

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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 connecfcvk6iq p03, xted to a 120-V ac power supply. What is the peak currentcp60iq vk3 xf, through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power brpyja) ,ms(b*h ji9 h)w61pj dissipated in the resi1pa6iyr( *9mhwb) , jjspbjh )stor?

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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 resistw7 nm of jac)lsw/50v+or 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 resigqsf9. 2 onwp b2w1aonv6+ym7stor 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 resi7 p82 rscwvlbz3h2*hy;3o. wfnkvm -estor 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 ;e5k;)n zfy-b6xgq:xfa8 q hw inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductivehzuvua20y. e .1( wtua reactance 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 wil zsbq z52bbzwd6:d32,p:v f0s/t vyqtl a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at o pwg faq,k/i-9.xb,l1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency:mds:ga +9 r+fbdb/pd of 20 kHz isd+/bg +p s m9dfbd::ar applied 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 throu)5x o vmljfd9i*3wy1, pmx6 wbgh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF ca/o1;n,aie)c3lgx xg7p h dh9iqs *xr5pacitor 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 capacyw5ms2bh z)pg 3.beo4 6 pqt5nitive 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 capacitob .buc-7yq w)jr have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitorn.2f0a cz6l rku77j,ljpw) lf be 100 Wffcnzlu0wj6 2k7l,p7.jral )?

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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 Hsft(r9.q.aw ,tobj x+ z and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resist:7c;a2j cpe jew 7ji-zance, 15.0 W inductive reactance, and 10.0 W capaci;j eep7 j7-cj 2cwiz:ative 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 impedano,n g+sfcz b2i)v *,voce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?,i*vs ),o 2b+ngzfo vc

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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-mslzo/ri69d/z6tsn s: u6 pq -cH coil, and 1.0-mF capacitor are connenzq/d9tr66u-is osl /zsc:6 pcted 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 sevfn10 ( .clwqyries with a 20-mH inductor, what is the impedance at 100 fcqv0(nwyl 1.0 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 pibr*iim4 zz47rg. 3ds)7dl abha isbai .lz44)z773gr* bri ddmse 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 series circuit with a 20-mH coil anf347gbtqsnvl0 n rxm7k 4x qz1 li8:y9d 1.0-mF capacitor for a tota7mrx1t08sn4q 9gli3qnzklvb4f: yx7 l 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 is needed in series with a 100-W rc i3:ny:uxnvk 7ct l1:esistor and 15-mH ccik c1n u:n:7 vyx3t:loil to get a total impedance 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 inm: p5d8ul6- x rjm*ptb series with a 450-mH inductor at 5000 Hz for a total l:5bj xtr6mm8*p- pudimpedance 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 a t/nn1k,r5a( 5niai sjs onn,5n5i (srs1jk i aa/tal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connecn(+g 73wpq zxsted in series with a 20-mF capacitor. What is the impedanceq7g nwz psx(3+ at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a t)w 1,1m -ekobsd jh,la /0 oet4t*muu,l(fkl10-mF capacitor at 1.0 kHz for a total impedance / ,h0 fjamelud,k*,)1t o 4(sbew1llo tmuk -tof 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 serqa,lfwuc gs4 f;5mj/ )ies with a 10-mF capacitor at 1.0 kHz for a phase angle of ,/fg cmjuqs4)alw ; 5f$40^{\circ}$?

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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 i3nw 5se5fg8 neqn2; nmo-q; nin series with a 30-W resistor at 1.0 kHz for a total impedanco 3n-w; qg5n2; seem i8qnnfn5e 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 wi)fjvny7,gw6 )n 7lovs r/:lc uth a 100-mF capacitor at 120 Hz. What is the phase gnul)j 7) l:c6ynorw vfs7,v/angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V anh(, to()p:jhyrkt +t3 y;zh6b+mdtct d 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF ca++chtytyjmr(6 okzhpd ,: tt3bh ; ()tpacitor 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 consists of a 1003cvrjj c/6v/a-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connecvcvc36/jj /ra ted 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, 9kwb x:xct *8 ;a(y4 xxsudc 7p1/dcnba capacitor of capacitive reactance 30 W, and an inductor of inducti u87a4dsbcdx /y9(x b:w; ckxcx1*pntve reactance 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 a series RLC circuit containing a 50-W resi;yle up*wr:i *stor, a 10-mF capacitor, and a 0.45-H inductor, when connwr;upe i*ly :*ected 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 necessary in series with a 500-W resistor f.yt;zr ;gia 94fge;ig+o(gs dor a phase angle of ezga; s;if ( ydg.i4g or+;g9t$40^{\circ}$ 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 = 10.06rhzxu mt(ej+yzt* w7,woj/ . mF. At what frequency should the circuit be driven in order to have maximum power transferre7w t(6rezw mhjj x z/,otuy*+.d 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 12pm p,.hw+zapi fi: 8ik ck83h6.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected t6kpphm ,:wpii8c h.a3i8f +zko 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 asben ich ,ium,4 s,1r:n AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What d 7,m2le*hwuss2qf* dn w6rnq.ze0x*is the power factor.2nfd* d n0*s u*wm6erwq,lz7q xhs2e?

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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 50-W resistor, a- uh izc-h9k*ucxw)d+ 10-mF capacitor, and a 0.45-H inductor, when connecte -+wc-udz*)xk ih hu9cd 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 capacitor and a 15-mH coil in sb;w b :y94aeqw*fk+ojeries?e wy; qk9bw+: *4jaofb

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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 , )m.rn crk6wveoc3/ba resonant frequency of 10 kow,3r/n kbr6me .v)cc Hz?

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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 dd+; ef /ifx(cwith a 3.7-mH inductor for a resonant frequency of 1000 Hz?/+ f(fe ;ddxci

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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 seri*3cmk)bk0i e wv *n:cles with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hzwb kc*e c3ki*:n l)mv0?

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