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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 u2fi*lzf pu voq(+-qqg bx4r2( nits of 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 statep+b r8q/ r x2pneox/*ds that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops ofi5vn (uhn4(8oblm tq/ofk /(i wire in a coil produces what kind of change on the in i (bth4f( nm8kn5q(/ uvolo/iduced $emf$, 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 thri t g1ykkj q-je.yiv,;s5;r q-ough a loop of wire produces what kind of itsyj5e-y;,;gqrq -k . vk 1jichange 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 diametekl idiz 47k.es 4mwk75r of a loop of wire produces what kind of change on the induczels7d7.i 4ikm kw4 k5ed $emf$, 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 maobs3 a1p p:9c-m5* o brslg (3tfk2bywgnetic 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, thfw2w 74 oeto :arwu0l,e direction of an induced current in a conductor will be that which tends to produce which ofloua20w :ft4 w ,7reow 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 magnetvte ly:-/aeb , is held above its center with its north pole pointing down. The stationary magneyt,a -:/e vlbet 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 (+6sypw uljeawwpd)0/ s1j ww+k2 yz;on a horizontal table. A bar magnet is held above its center with its north pole / 6;js+1yae2w 0plz+(uwkpjw)sy wwd 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 rbn qh te6;39 z3d9gsbmegion where the magnetic field vector points6n tb3qdg h9m;s3e9 bz straight up. 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 exod h4b(34ea +um: ;9lahsdpthe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from :ehb(u 4de+h9oam ;3l 4apdxs 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 table top in a region where the magnetic field +q/-( tm+k hn/,i 6peq8rcihqr+y hgxpoints straightqyki- p8cgiqhr6r+h // t q(h+ne+ xm, down. The magnetic field 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 on a horizontal table and carriym347ihw rr2p es an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed fromh237 4ry rwmip 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 fiyx :n4 , rtxra+mb*:uxrst. As the north pole enters the wire, the 4xrx bytu+: *n,r m:xainduced 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 is rotated at constant ai0lc;qss cw66ma./bro 4uuyg z76.5jyr tt/gngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's 6u6t.r.tirqw;l gy0ajbuc4z6om5sg /s yc7/ axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed aboutfz5taxw y9+ :y an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the indzw yt59f:yx a+uced $emf$ 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.5v uk ;gz5yhiei( +p,v(tmh:u
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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 5tpchv d9u4w. sw(u0;* ypchrpkbo 07an $emf$ 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. The 4qet5tgz xs)zxzbzmh 21b )7($emf$ 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//wt69+s f kl8jcckrc) is moved northward at constant velocity through cclkf8 rsc+t/kj9/w6 a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocity:h(woth4,u sug 4 dlg:am j*z1 $\omega$ 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 transformstfsaf n)1vc r (8ux7.a

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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 secoi3 qi. .yqc/ ,szt3o)moyuud /nd. The frequency of th3)3i .u,tyqzydooq cmui .s//e $emf$ 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 ujxzjq:+,2f exw )hg n,3( urwksed 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)/;8e -,we1 gnndg hzj,ti lrqevice 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 coxdh6e8 a/ 6;y0upgdz oil contains more loops than the primary coil then it du;g6ap/o d8xey6h0z 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 contains more loops than the secot2;u zpwxq 36fndary coiz p2xuq3;wtf6l then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power + ee2 3,dxitn 1vn7mc kcio56lrg )me8input

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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 ci8 w7 8imh90qitdbnx:arcuit,

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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 bat 6;mj ;lj2 0zzg7ism+ qyu7k3y3cdedxtery of constant terminal voltage. At the moment contact is made with the battery, the v;djg m7 6l 3s7jykqci0zz2y3xd;m ue+oltage 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 connectedracf5b3zav11 v o 8ehy8w7yqv/o/1 zk in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acr 3 87ya1wzhy v1oo q5a1b/ve fv/r8zckoss 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 reqdf l+(k*rs 26)erzxssistance 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 t6m . loav6h3coo 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 are8 sft-kb ;xfj/:hzg0j connected in series to a battery. The time constant for the circuit represents th -0fbs8;hg:xtkjzf j /e 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 connected in series to a battery. The batew lyvr+m 1h(z,lo3,h+ji wyn,s9 lo5tery is suddenly removed from the circuit. The orn1,v w(lhy9+zjm,+oe 3l islhy,w 5time 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 samemp; 5en-lng:c rf3e1d 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 qrjd g9gxfd:10yj 07(aj u5jqpower supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In thisvp 1a61v zbf9d circuit, the currentzbd91vf v61p a

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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 ,vzudjb,p9.*5 s)voy ytaea4.uqjq .circuit changes by what factor when the frequency isz.by upyov,d. 4*qs5)uev, jj. aaq9 t 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 ,3giuqx c1a0u :jkse *the AC voltage across an inductor is doubled, the inductive react:x 13ieas,uku gj*0cqance 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 acroszjo .tcp mju7vy)/j ,0s an inductor approaches zero, the inductive reactance of ,t./pz cj )v7y0ojujmthat coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this c ln xe8f-96bdvjx4r0 tircuit, the currentn t v8rj94-6xe0ldfbx

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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 the frequ(;wn:r tr spv/ency is tripledn:wr t(v sr/;p?

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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 volr9o+ux)a; hei*0z7x(f vy xw ptage across a capacitor approaches zero, the capacitive reactance of t9avxew if;(z h7x+y0or)*ux phat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacxsmd*z x ;,am)t 3suoc2c2m7zj-w7 ycitor in a Rz )a-s;m su732*z,xcd m2jtcmcw y7oxLC series circuit?

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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 defi7 pq(rekkr/ zr5gb9m- s(v bb4ned 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 imp-a*at l *1pc ;kel-sqcedance of the circuit increases if R increases. Whea-;*taql* cs1e p l-ckn is this statement 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 increasesr*wkpt6;z9 b,gy:spt 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 cir(r d8wcfle*-h 7ehoas*2nkkb:w o38f cuit 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 tcne)4tga l*kgt4*a) hkr 1h0mhe capacitance both double in an LRC series circuit, the resonant frequ)g)*hk chga4r lank41*0e ttm ency 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. At res,l e73:e o 1iui:)ycapr vdhg2onance,

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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 occu)nizt5q 4ds 6brs 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 1,nente/7c es is rotating in a uniform magnetic field of 0.20 T. Finn 1e,estn/e c7d the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetgf*bqo2:1tsg ic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and tg1gtob2q*:sf he 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 magneti8d0 ea:o5jz thlym 0b6 1w8cbqc field of 0.20 T. Find the magnetic flux through the loop when the plane of th05h0z ta:bjqym 16d8w lbce o8e 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 45tr*ixk pdi6area of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from c7b aye:rokgba0v8*-f2t :dv$4.0 \times 10^{-5} \; Wb$ 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. w ibvf-:g +/fl;q5x,cwq,fce(g;cln A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 inwxngi+qvfcw l, ,elq /f ;fb5(c- gc:; 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 a nsf96 gg/bvw4rdn9: i/,oipip8x9qand an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area9))ajlt /e e:mn4v9qkxfbur +bt/ih . $0.20 \; m^{2}$ 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 locationmc9zklw6 7zg)2dz9 ak where the downward component of the Earth's magnetic field is z gz9)cmkdwaz9kl67 2 $6.0 \times 10^{-5} \; T$. 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 thatki+ u0f l3xb0n is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through 0k0fx+ulb i3n 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 xg0yd,;- xbqhhas 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turnsqu, 9+ ei8vngj kech7. of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop0;hyt)c/ag yr is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perr g)h/ct; yya0pendicular 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 consisiys3 xia 1hm4h/x4 w6wbx(5bmts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 122h) z v-5wcrbytc: xz0 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of wvczch:yxbr -)02 zt 5the 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*kfpn(s *vgktenu; 0 : 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 mote -fpgtec9t 7+or have 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 resist0bu;ks7y*cq4jw xcdx 2ujx 5-ance of 6.00 W. The motor operates on 120 V A042cjqc xu;y7xx k5u -dsb wj*C, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. 1xb vy+.va2 rd7hc;ip The operating currecidv;r1v2 7hy +bxap .nt 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 24-V ov):j z:gy3uz*defaljwy(6h4gca; * power supply. The operating current is 1.0 A at full speedfz: *y:wa(3yl)jvj uhcggzea od46;*. 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 rewdipz 5t66 x2csistance 6.0 W is connected to a 24-V power supply. The operatin6wp5 t cid2zx6g current 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 l-,8 y kddlblb;m4xhtyi/ n6)6iyv-k is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer fxm6 szw7, q h.rye 72ndod-u1causes 14 A to flow in the secondshr-edx.1wz 7qm,26d ou y7fnary. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns bssfcob2(/; 8ifxx1 oare necessary in a 110-V primary if the 24-V secondary has 100 tuo/(fibo;c1s bxxs 2f8rns?

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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 5se f+yxhso 9e:c );dor 2z20a(i1gkvd00-turn primary coil and a 2000-turn secondary coil. If the current in the secondary iv 9)ds:y rk zes c2f2iae10 h+o;dog(xs 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. Assum za hgyk 0p9eg)av krflw;d18vy;7h8 9ing 100% efficiency, how many amps 8 7kvg;a9 kv9hd1aw pyh 8;rf)0gzelyat 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. Th2b8ubehu1kptz* b ;t 7e primary coil operates on 120 V. What doebktz* hb; 8u217tupbe s 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 covff(7ct 2o 1lf3 yz(phil and 300 turns on its secondvfozp3(y 7 2c1t flh(fary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns h4hlg ,hdv+2mac*gt9 on its secondary coil. If 120 V at 2.0 A isd+9*c gh,m hhvg24alt 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 4g t/3kwacmj6 f)ox.zhas 200 turns. If the input cxc4g/f 3wz6 )ktoajm. urrent 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 h*u.4.wl xb pp( ekf;pngn:y1mas 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary t nn4.u(1:*keb fgp;wpy xp.mlo 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 trano pvbgr s n*iqu.l:m-)z:jx-v4oc1k/ sformer has 100 turns and its secondary has 200 turns. If the power input to the primary i-zq*:gi jx:mv blo)/o.v4s-c 1pn r kus 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 mnn9f n;13t kqat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turn 3nq1 tmfk;n9ns.

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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. Tvu hpcio1uqa.- ;q, +vhe 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 percenta q.o;q,1c+a puvv-i huge 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 +joyid ih3q kfl,ak-)2il;;u60 A of current at 120 V. The voltage is usually stepped up to 4500 i ,i)qukka io+; l-djy2h;lf3 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not 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 rt3qxl/g tqdpiw;44/mh7 m/s kesistance 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 txlmh i7p/gq;4sk/twq/3m 4dwould 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 awqfz;0 ,fj, iy total resistance of 0.60 W. A generator produces 100 V at 70 A. In orderf,iz,yjw;q0 f 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 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 woula j(0dro lkk, zq+tl36,ol:etd be lost if the power were transmitted at 3000 V instead of at 1000 r0d, l qe3t:k llz6 ooak(,+jtV?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It f7,x xrt(nb; en 1g: lp16udelis to be transmitted on a line with resistance of (1xe;u x:6ped lnlgrb7fnt,10.60 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 ofv sj .c8 1gj-(jmwf3+k;asr hg 5.0 A. How much energy is stored in the coil's magnetic field?c+ fjh v (jm-aj813rkwg sgs.;

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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 inducu6rzif* -ogkc41 pqu- tor. What is this circuit's timei6qgp-ufr*4 uck-z1o 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 cirec7s.)pmy1qujf 26( jdko zs 3cuit 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 :fk(asf.qzb; is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of r1m1*qowf3q tthe lamp?or q wf*m31tq1

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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 120-V ac power supply. What i7oxmyw(ul 3ee4v .ju2s the peak current thr. 2oleu(vuwe xm3j4 y7ough 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 p lyjvz;akw 5m5jfxf4b3h+tl78 n(6f 120-V ac power supply. What is the power dissipated in the resistorhp6(yx+ lnwfjakl3vb 8 fjm4z t55f;7?

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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 resistc t(mhzw4 9x1f9quib5 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 resistor is /pl fc)b/ yx6m$I = 0.80 \sin (240 t)$. 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 500u cqqz)l tf.t4p j,o.-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor (, 9xq-g, wxbw :sa6yjle,varn. 4ufmat 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 1000 x;co,b0t mi,8dcn qv s j92vssm.c2;uHz?

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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.s+ srpl8th m3)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 reactajmu-ux4biie 2mw5.x +nce at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of gl) z)fe assysugi2)oa -p)/.20 kHz is applies u -g)fepgzl/i.o)asa )2ys)d 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.wby7 x- 0a cnovk0m.lw v5nj/ 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 cakg:n8 1mv4 wf +tydo+bpacitor 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 neebsx.s7y wgzc/gc ,xx 1g/ 2y;lq3tbn(ded to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacit xicrwa19j:/lk t4vo wxj55 9tor 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 0.01tgc:/ x/0(j m,qj qgy88 vdmfmget19w 0-mF capacitor be 100 W?//, gyg1 9tfmmwqd ge0 x(c8j8q:jmvt

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0-2 (jpzg+ mktc pf6xrz+pdcypo: ,:4k 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 resistance, 17 ao/qry g6um/5.0 W inductive reactance, and 10. mqg urya//76o0 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, 2js7r-f p ypqdc:d6pf1i 6p)w/vty9- np1 2uda0-mH coil, and 1.0-mF capacitor are connected in seriefdavs1jy-p1dywn7i6- rcupp)t qp/ p6:d 2f9s?

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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 resistomt,1,w7z q ogzht +el3m:mx v)r, 20-mH coil, and 1.0-mF capacitor are connected i, e+ho,wztxg 3lzvm1: m)mtq7n 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 wis04z*tz1,pv2st m nsk2 *kfsdk,8 b zpth a 20-mH inductor, what is the impedance at 1000zzs f pvst8d4szkmb*ksp*, 1 k,0t 2n2 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 i,m4 b,6vfg 3gxvkyif/n series with a 20-mH inductor, what is the phase angle at 1000 Hz?g myxf63v4k,,i gf/vb

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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 circ,. 6.zd riojgiuit with a 20-mH coil and 1.0-mF capacitor for a total im,.jgozdi i .r6pedance 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/e uh4-ehhloa55ln* h -W resistor and 15-mH cohe/l 5o4hh nlehu *5-ail 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 in series with a 450-mH inductor at 5000b5dhy sf1*t m (ifhx1/ Hz for a tot hb(/fxy 1*s fdmh51tial impedance 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 2c )ko/c 8 o-rhid, 2hpyrm9tu1.0-MHz for a total impedance of 150 kW cmr) ih p/8hkrd,y29-oo2utc?

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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.uukbxskxnujv/* u2k:1zi ,63 What is the impedance at 1000 2vs/x 1b*zi3kkj:uu kn6u ,uxHz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 8rvklupfk ej( .( ;,tr1.0 kHz for a total impedance op kk((l,rtfvjr.; 8e uf 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 needecfm dty;)z2n;d in series with a 10-mF capacitor at 1.0 kHz for a phastzmn ;fy;d2 c)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 gs k *pm)a-qp3a total impedance ofp)g*kpaq-s 3 m 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 p tbk;f,s00tbe( j50f ts m)5jle 3tim100-mF capacitor at 120 Hz. What is the phab0f tpe 0k)550tf,i3jmetb st( mj ;slse 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 rt:hmax iz.4bbd0) p744ww4 lth ;qc woesistor, 20-mH coil, and 1.0-mF c04twz;:4 cbbhmow paw)7ihdt .x4l4qapacitor 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 100-W resistor, a 10.0-mF capacitorh17 ayg52tzfn:jbm f cfda: up-s9f57, and a 0.350-H inductor. The circuit is connected toaadf 7cf2n5s7mf1z- b5g tyjhp::u9 f 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 reactance 30 W, anbez-z jl 3i7n7d an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Whatle3ijbzz- n77 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 ru xj/52 gfbvu ,h muu)8m3jtp63xv+n a 50-W resistor, a 10-mF capacitor, and b umjf3x/v 36 +u8n5m)2uuhrxp vj,tga 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nece6+c+pos0sj9p4 w tnft ssary in series with a 500-W resistor for a phase angle of 9pjs6 wnp4 0+cttf+so$40^{\circ}$ 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 )i4gyl rb1:p-o/l+vlh zu- hrmF. At what frequency should the circuit be driven in order to have maximum power tzhv g+ l4b-1p-u)l r:hloyri/ransferred 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 resistan);fgo/on3n,y vwuqj )f h, g9nce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?g3wfnyg9 u/ hv,nnfo)qo)j; ,

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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 ACd ;qibcst3+5b;gjj o: t9kl7e9djio, 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 /v*rwkns0wtd n.2 8leof 30 W. What is nlwd2 0k/ ert.8 *nvswthe 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 50-W resistor, si j:nl,,ncc5 a 10-mF cac:njs5n, i,lcpacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15 ,gv1/d sgeob.-mH coil in series?s,ove.gg b1 /d

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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 seri l)ueez-8+w d) fa7 tiaqhnw8:es with a 4.7-mF capacitor for a resonant frequency ldaf7 -wn) +eiq8:8ze h) tauwof 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 inductor3dz1 a:bnbk//kbq:p h for a resonant frequency of 10pkb zkabn:13 b/hq:d /00 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 resisto19jd gv ,xgmh1r and a 40-mH coil if the resonant frequency ofgv1 x1 jg,hdm9 the circuit is to be 1000 Hz?

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