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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fd lne fv2)us)vf, gi21lux 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 that thsudikch5( ipjp5,q5 yhv 6-*je $emf$ 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 , ,bdt vcq;c(vwhat kind of change on the,,;qtc vb(vcd 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 fielg 8fh):z6nmw 1b( bdmed through a loop of wire produces what kind of change on the inducedd:68begmnb hm) wz(1f $emf$, 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 xu3ln : t6z8vqof a loop of wire produces what kind of change on the inducedn t6xq3lu8 zv: $emf$, 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 z pt) +9wbd7vexxd )a(.sccv)r- fsv4magnetic 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 induceh,-/gamb / l8xqd,m9ptfks4i d current in a conductor will be that w bl/q mpk/ 4xdms8i-g f,9hta,hich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is -g2gkzb.gn9 z held above its cenzk- gn.bg9g z2ter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tabxx cp;5dn2is4.iq f+tm2 aom -le. A bar magnet is held above its dpamo;iic 2 xnmf sx-+q 425t.center with its north 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 the magnetic field vector2 2:hl1vj,x /p:9hv,zsqkap wgvhju/ points straight u2/wjp a: 2 vpkv1zh/sul vx:h, h,9gqjp. The magnetic field vanishes suddenly. 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 magnet.lie hltmj*-wfa (7j(ic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field ij(a-fw 7tj(h.llem* increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where t 4 hp5ng+)x+ olygb3wc b4kwf0he magnetic field points straight down. The magnetic field disappears suddenly. When viewed from abo4 b+wcb3f w0+hno4kp) gg5xlyve, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing cus3.d) 0drqi rurrent northward. Two cu0 .3dqd rir)soils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enwbqaf :mo d( tkyg)1/6tering first. As the north pole enters the wire, the induced current will be (as viewed fro/foqwbak 1g(:6y dt)mm above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis w3hz:do tt .jk*hose direction can be varied. In a region where a uniform magnetic field points straight down, what mustjth.:k 3* todz 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 wi2yuqt4n a ,9(of nqaf9re is rotated at constant angular speed about an axis whose direction can buayoq9taf 2n(nf 9 4,qe 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.5ih6/ycknzqwq) i4 i)
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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 t)4z /8hblgih7x x2mbxhat 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 adzfb2hj5d570o7jtczu x x) 1i magnetic 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 ezl,:k bgv+ an+vag28uf m2r/z*a3p )gw:jzu) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acr+a8eb*zfvu2m:g v zgz2ra+/: ua)gpn w j3kl,oss 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 const5/m+wms ahjairzl uk(7t9 3ngmd8 (g; ant 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 transf4p6/ p3s,d:k w nityob a:fx4 wke-,taorms

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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 *9bb;xv7 oqj/ft +fgq revolutions each second. The frequency of the b*bg; f 7+/qtq9vx ofj$emf$ 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 usedy*;5 la/no: aisir ;2 qnq3e ehv8jyu/ 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 devi eb9+e vu/2n8tswe ok-nrd62y ce 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 more sw9eca:-n0 :rtz w -jkloops than the primary coi0rwjt-e:n:wa z-s k9cl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil cont6j2jx+dy6s w+k 1uo1 (yj4:fqqig lwn ains more loops than the secondary coil then :sj1d4gq uy+nxi+ yj66fwwq1(kolj2it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inputm q3qufx. djk5)p+3uw

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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 resonasigbh4 :n6 erd78ta9mnt 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 s xptaw0ld b33d6y::oab; w:jderies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the v 6jd33d ;axby0plwt:: d: waoboltage 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 sf)8m udj5xquk 67z*.jo. t cware connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the5z)jkmudj6.q*x.o u fcws t 78 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 wix; p,a )gf;ien.swyp6cf- x. ifvyw2,th inductance 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 to aneurwre.s o 4r m(l6a14 $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time coqb, vo.84isi+mjct*p nstant for the ip4.+sb* mv t i,j8cqocircuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are kn ch 4ks4f7bn.r3e.nconnected in series to a battery. The battery is suddenly removed from the circu4 ebnnhfn7.k ck4sr.3it. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unib jsud*u90xd 9ts 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 eya;,d:r(n4 .-ys km7k 9iqbkbqox )dcurrent

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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 supplvul qypy-+k4(y. In this circuit, the currenpyy +(l4uv-qkt

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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 fqdk397tfu 2 q qddg4a*requency u4gqqd qafk2t97 3dd* 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 t.sj mu/ke5z hrna4l/6 he AC voltage across an inductor is doubled, the inductive reactanl 6ume5kr s//.nhz4a jce of that 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 approaches zero, the in ;*69 cjrd1gpcgaku/.n /o4a xbcojk.ductive reactance of that couca4g6ok pja. b /rjcx9o/*.1d gn ;ckil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the ct9njvip lm. w( .shyb8o 9y*gqk0,zi+urrent (, y8whklonb+z.spi9*m t0qi9 .jvy g

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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 realx.a l(* .qwhen the frequencr* ealx(a lq..y 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 approa9ih6serf j 24dches zero, the capacitive reactance of that c e2ihsj4fdr96apacitor

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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 vol,q1 oawh9x;p ztages of the inductor and capacitor in a RLC series ohq ;p,a9xw1zcircuit?

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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 iwu- (fhe+ ld53huei /.g1xzcgs 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 ifk7 c gq9/ ehpdk0z:pz; R increases. When is this statement trpezqz 9c;/ : h0dp7gkkue?

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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. y1w0s3 g rog)lv tv1zx43/uxzThe 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 iz /2vtgce(p yq/,4u2(.qa )punei nethe 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 capacita jpts6dmq d,rzth (g41s *19ffnce both double in an LRC series circuit, the resonant frequency ofjd6(phs,1s f9m4t1qf *gdz tr 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 drides*-. uc aapi. (7tqmven 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 -d7-x1 s-mfdpatdg1 y3p+ivf circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatiz 8wp4)kbhk. mng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mpkw8mz .b4) khagnetic 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 inl: z9h/xgo .iu 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 perp ug:hx/oli.z9endicular.

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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 magnetico,hix nv mf7l5pj m,xg- s 37+zdno.a5 field of 0.20 T. Find the magnetic flux through th nz3jv7hm5 amx.,di-7 +xn5glo,osfp e loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced fro9jn 7 ot5/zgbtqg e1hx6j91ejm $1.0 \; m^{2}$ 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 changc+-xae*uls9)kblx4. ec* zgk es from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 c1f puw:w0he)l hwc u+6m. A uniform magnetic field is a :efhuhlw 6cp+ )0w1wupplied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and a c o*e. x56hbc82ksecpn 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 arr3ls -)h*b: z2zgwsyhea $0.20 \; m^{2}$ 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 lv;c +aa : ltfj.i7nip/xplp-edbce4ni* v ;9(ocation where the downward componeae cnbcj4n tpf7-i/x .lv9i ae v;i+ dpp(*l;:nt 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 at a constant akqb., iya(rh ed7i m9,shid2) ngular velocity of 2.0 rad/s about a vertical9i),y(khd im2 r7hq,ed sai.b axis through one of its ends 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 lol-fnsvi+eah kn0m sq/89f7x /g j1 9kjops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of aretno1t.p sg6n /6:r 4wt*fjfjpa $0.090 \; m^{2}$ 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 loo,bavn; jh.*v tps on its armature. Each loop is 12 cm long and 8 cm wide vajtn.,;bh* v. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be 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 wirk)a: yo6 om3kje 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 with an output of 12ak9in/+ rof5c V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the ar/cfnr+ k9oi a5ea of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxx94x ip7qpn 0 1qhwfkjq-tw22 imum $emf$ 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 6sv+:dr9 n0uli, 2 e(pydt3 vjh.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 (-3xp)batwx7mpb rpl j5 oe*, a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generaawjre* p)mxb (7lt3 - pp5ob,xtes 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 69 unfzl,.h 5iz.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up zhf9z.u i,5lncurrent?

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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 24-V powq mji1o9 poukta0 +hhex/j0ui781x3 oer supply. The operating current is 1.0 A 7qp9 +u umj8ohtj/3xo ihak1i eo100xat 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 ifopm,rv c7 q f9x+4)-oufl j;a 24-V power supply. The operating current icmlx4 oo,i;+f -9)v qu7frjp fs 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 t 6r+ca ;u* ri:mbtb0xt.p6syco reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 50kcm*hpiz(b -2c bro xe9-oc A to flow in the secondary. How many turns are in thei2z-x0e m(kpo h *5orcb9bcc- secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V prima 4ln(sn (:wb*6 bqnyrcry if the 24-V secondary :n 4l6r(bnq (s*yn wcbhas 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 o 7s2t9m(hycik/p t,bprimary coil and a 2000-turn secondary coil. If the cur9 ot mp(ih,bk 7tcy2/srent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiency,uf4f9x yo2w s3 how many amps at 24 V can f 4u3ysw2fxo f9low 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 10.0ynov+xo* )2us6mw- j .0i (gp lxo(ukf mA. The primary coil operates on 120o6n yu-o + vj0uwxx)2*flo( p.si( mgk 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 on imw d gue4d0dmpf)5rg;6r e7 0vts secondarr0; udmd0g 7we6pfe r d5m4)vgy 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 g+arv3a9 p; /iomm-h f*/xq iyhas 60 turns on its primary coil and 300 turns on its secondary co /ma vm3o r9yi*fhxq p+a/i-;gil. If 120 V at 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 has 200 tub r/ ,eo kjer h2q-zv:,k(6kbcgq3x3 zrns. If the input current at the primary is 100 A exh z,k-o:k3 ek/vjqcrgb b 2zr(q3,6, 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 100d*dxofg 8sdj* n+fxqb np(8k )s-g20 t turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltg sd xd 8)ff**2t8kps0-ng +xnqodj(bage 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 ;(k6e4s iuwxv has 200 turns. If the power input to th6vu ;sk(w iex4e 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. The voltage is usually stepped ,z nbh3q)lvs 4ku d:t)crpx86 up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find ,3 84kpbc zqhr xl))nt:sudv6the 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 cuzfmu1lqjr )d 8-6ra)errent 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 -mrr18q zu)j) elad6f. 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 sxadwkp)6:ryu a7*vv. tepped up to 4500 V by a transformer and transmitted through a power line aa v:7*kv6rw xpu.dy)of total 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 cw6s3) pm0leba 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 the original energy would be lost if the transformer 06 lcwb3m)peswere 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 resistance of 0.60 W. A generig (r/al pi:v0ator 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 origi (/:va0r pgliinal 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 wk88v/wdlfgi(p h oh* 9c6q6scould be lost if thvd96f k 6w c8hgioc(s/p8q*lh 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 genel,px 6*uj yu+ui9edqg4jk3 s l(qg- j.rator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W.g3g,u i* s(lqlu. +puek y-j jqdj946x 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 ee.je8h u-iq. ifcf i--nergy is stored in the coil's magnetic field?- ff--h.uj qi.8e icei

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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 resistor and an 18-H induct 7rr8rz;qr:w u1;84 g.w mns. gugwopqor. What is this circuit's time csr4p;zmq w:.wor.u8rg; q 8wu7gr1ngonstant?

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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 3e6 ub *u)fksqan 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 outlet. What is the peakh8nua 7a +,2k sik3xdtdj*we7 current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is yhuzkx 6ed, s7 w(-h901 ugvdhh*a;snthe resistance of the lamp1 d7h9-ha*edhs kugxwu6( ;0v ,zyhns?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a,d ;dggo;a ;ga 120-V ac power supply. What is the peak current through the rea g;odd g;;a,gsistor?

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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 powey3w +h7 kj lff/jfk:w.r supply. What is the power dissipated in the resistor/y fww j fhl.+3k7k:fj?

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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 i/hn(q3ccxe7iy y9 .md s $I = 0.80 \sin (240 t)$. 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 resistor is1r rcu kc ,rayuc2nl6c7ijf1.u *e x75 $I = 0.80 \sin (240 t)$. 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 xr c0)p*g uw-xresistor 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 inductor at 6e(z a.y ztf2wxs :dr4(0 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 reacagwx.9 n0i5mnd o+i8xry. jk9tance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactptkrke:0 1*e)wh)wuj bqt2 e9 u9hg +qance?

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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 forzmf*eb np i/87 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH )pxw/.ttv:ofe18 y tlinductor when 120 V AC at a frequency of 20 kHz is awvltto:18 ) p.xfte y/pplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz soujvz,. ga 0v+qkl7p +tqrce?

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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 a7zw9,vux(1 l ei9hx i .,yjtc n/6bhacapacitor 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 capacitixwm h y m 0 j25p55eedtq+r6wy/tf-,ojve 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 capacitor have a 6mn m/xn*8ek09xho t3oa6 gl breactance 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 cne 5s;qs5(xoi apacitive reactance of a 0.010-mF capacitor be 100 W; q55oei(xssn ?

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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 10t dpx8t*zp3aq8i 06, d3mj icf00 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 seuuo+eg. ihu :5ries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac+io:uuu g.5he itive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0pfxvq di tye2u +uf:684k8 l,o-mF capacitor are connected lu8,uv+ pd4iff ye6q 82o:tkxin series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20zs7dow g 22cy3-mH coil, and 1.0-mF capacitor arczdy2wo7 gs 23e 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 conn20k xce7*vgvq 2h1o (pa)g qcqaej:-nected in series with a 20-mH inductor, what is the impedance at 1000 Hz?g2kx(2ce-1 va* c:vnpqqqoe)0 hga 7 j

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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 withxx+d nht8+ +tg a 20-mH inductor, what is the phase angle at 1000 Ht+x 8+dtx n+ghz?

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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 iohv szativ 2o9kuai, 07 l:k99n a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impeda0o99kai9v2 z,tsha7 u olvi:knce 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 cadnr4cyp:y pe-+kt. 0d pacitances is needed in series with a 100-W resistor and 15-mH coil to get a td 4:e ypr0yt.pn-kd+cotal 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 in series witiw0 4 lu)gw:duz jl,b8h a 450-mH inductor at 5000 Hz for a total impedance o:juigl4b )ul8d,0wz wf 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-l,q avz a,c /-99nirlwMHz for a total impedance of 1-n 9wqa,zlvrla9,/ic 50 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 serie:tvd;dm4c3t qchga(aq) dh,a5i e5 i :s with a 20-mF capacitor. What is the impedan h ac4()am5td ,:edq:;i tqga3v ichd5ce 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 /b/ ;sysf s)l z5*jff;y/vsfbin series with a 10-mF capacitor at 1.0 kHz for a total impedanc; bsy/5j)/z*ff fsssfl;by/ ve 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 capacitor at 1.0 k4sjym *7rq.dh Hz for a phase anglm4ry*sqdh.j 7 e 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 tot vabkza/t9m3v7vn smz7w3 2; val impedanctam 2/9ks33vmbv7zvvwza7 n; e 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 capacitor at 120 Hz. Whatuo pf7- m84jjx is the phas4ux8 m ojf7-pje 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 and 1500 Hz if a 100-W resistor, 20-mH coil,ahphq;s (q;5 y and 1.0-mF capacitor are connected in seri;q( ;sqyh5ahp es?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capam8p0v9. m ujcocitor, and a 0.350-H inductor. The circuit is connec9jommp8cv u.0 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, a capacitor of capacitive react kx a4zu9wj,i8ance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source.k9i8 4wjax ,uz 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 conv p+cy0e/j: lataining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup0:/jel c+v yapply?

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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 fzkmp-e s 0,z0lor a phase angle ozek z pm,s-00lf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what fro5zcu w(ic c8,equency sh(o,wc 8ic5zcu ould the 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 in an ac series circuit with 12.0 W resis;wc *ckgpk1 w zuj3i).tance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to jzu k.cckwiw1*p; )3 ga 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 circui 4o* 9ilt-nphtzno* 3nt 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 n-d, 6bsw2cgzimpedance of 60 W and a resistance of 30 W. What is the powe-s cngb,6z2 wdr 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 5(i.mteain2e vxy fy232* kr: f0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when co3y *m22f .k xrf iyiet2vn(e:annected 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 uae.gi1 p3y3bi(4.snch 2 ibu of a 1.0-mF capacitor and a 15-mH coil in series?c hiy ua.(s 41ib.n2eigu33bp

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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 7m(ou*02yat qi+(2j kjbm olyfor a resonant frequencybj(m2y yilmtaou7*0o(k2 +jq 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 serie(1s tfkk1lvnt3n1 )-qv dmq6gs with a 3.7-mH inductor for a resonant frequ)qmtvvn 1( 3kd-1g6ls1 ktnfqency of 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 be placed in series with a 30-W resistor l //j0 ft /4m+aw7rc6sewgy4 z9h;c iy/qbnsj and a 40-mH coil if the reson sehy/4jfw zw7aq r/c+ysmtjncl0/ 6i /g ;4b9ant frequency of the circuit is to be 1000 Hz?

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