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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 magnetirngjcew2in( *-jijk.( w8jz3 c 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 inductioni8:d/ro dizyq:q,5 wvc 7a4na states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a conybkpj(58 a0 vil produces what kind of change on the inducpk8( vbnj y5a0ed $emf$, 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 oj;xdphtff y,c32 3(me f wire produces what kind3pm x 3fe2(f, hyct;jd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of ag 0d; zreuhe-/: lq+cf loop of wire produces what kind of change on the induce;fq0 +grhze:dce/-uld $emf$, 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 magnetic fielddnul yl zq(9:ct05:y2reba3 u 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 *n ae)n 29znfvvb.7 jninduced current in a conductor will be that which tenbnnf9 ve a72nn)z .*jvds 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.u:q21z3.ga erc ao:xv A bar magnet is held above its center with its north pole pointing down. The stationarorxe 2gu. 13aac:z:vqy 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 table. A bar magnet is held aboow3jjgw8 74 yzve its center with its north pole pointing down, w 873jjwo g4zyand 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 th )a *a a6sx6iruw:;ioce magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewe aa66arucw x;oi)*si :d 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 f 5ttd7c j7i7feybsj:0p s8 w-wield vector points straight up. The magnetic fielddsb pywts 7jcj5 0t8iw e-:77f suddenly grows stronger. When viewed 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 table top in a region whertaeb*g-opq sy)e3w2 ,e the magnetic field points straight down. The magnetic field -yap s 2*q,3oeet)gwbdisappears 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 t irs2me alc. ed tr49)l8m4c h31vk9rny;ar2nable and carries an ever-increasing current northward. Two coils r a 8lk tlen2r) 41yvmd2 3 9ain.rmec;h4rcs9of 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 loo(0l bmcl7 3mnji;1 (sstur4nep of wire with the north pole entering first. A3m s4t;nsjle(c( l0rib1m nu7s the north pole 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 is rotated at constant angut6(hx:8 rt0v7,qc tv; qqntqr lar speed about an axis whose direction can tt:7 q6 trq 0tqn8rh(vc,q;vxbe 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 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 s81zhxe) x8+dp xptxw( peed 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' 18 dwh+) t(8pxpxexzxs 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.-piu1c /bca*si i1jy7
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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 thatd :a-7uyc.rr r 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 fieli iffisn6fim*l 8 *75cd. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at cognm1rav:cu i)y( ih.hs o5a86 nstant velocity through a magnetic field that points straight down. Make a statement concerning the p5:vo r1.6)iaci gmh8nh( s auyotential 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 o8hb83ik9)bigx ,lco2 0yzo9 *xr cai $\omega$ 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 joc5kehjt.+d /wgyh3.eh /7 oivy, f 7transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency of ()gmpr j:/gs4p rce9q thsej:grpp9/q gm(r) 4c 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 devic2l 9o24f1kwfududz f ,e used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thnik7fnuk1zyju1233 h at

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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 secondar2t /vj5ro f4qs0rl1rrkey.i+y coil contains more loops than the primary coil thersli rt ev1/0q2o rkr4j5 f.y+n 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 contains more loops than the seconda6h 9t4 zrqtn3vry coil th3tvqh9 n 46trzen 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 por9tjao-5;d b 0znfi3 ywer 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 ci+f3/; 7 f*/x ckujr pryhq4guircuit,

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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 ,m/ -l8h0 svpt agv(ex+ha5x30 j (d3lcxfftyare connected in series to an ideal battery of constant terminal voltage. At the moment contact is(a ve-+gsh8f x,x0hjl3y( 3tlm t f0v/dpxca5 made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an i2rl) .-ilpbg0bl4 yyk3j .vjbdeal battery of constant terminal voltage. At the moment contact is made with the batte jl)i0bb4-.3jg2bvk. lpy rlyry, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is co +)ssh) a,hwqb.ts ls9l ,mfb9nnected 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 w(;8ozw z7 vcqua o tb27m6j p5v8-ruviith 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 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 conn9c+6tm n t0 f (2;3; ddrino,vgdsglfkected in series to a battery. The time constant for the circuit representsi3dv, r6slgk(n;m ntt9 0 go +c;df2fd 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 connected in series to a battery. The battery daed bk2ipz2j8 6qr 5;is suddenly removed from the circuit. The time constant for of the circuit represents the time required for 2bj;8e z2d k6pqrdai 5the 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 unixr 2 5ax.kifys r3y- mxcn43s0ts 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 circzn ;r+fur+fp .6ud: ifuit, 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 ty (9wicd8b4ni his circuit, the curreni( di8nb49 ywct

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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 cic hf/ *d7)ifl+w4;3bxqkcyz jrcuit changes by what factor when the frequencyhl 43x /y);+zd wbkj*fq7i ccf 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 inductor is doubled, the inr5 z9 gtyn m)0nfrc2tmx( plc*6,:m czductive reac*tz9nfny2xp ,5r ( )tcrmmcg m 6:z0lctance 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 zer 9g 4qof etijm37hgq51y.es4lo, the inductive reactangfe.y jqq9 3s4 gmohlet7i154ce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circ/knx5 wv1bb:fpa1m: - jts 9sduit, the curren1 a-:dvfm5w kb/9ts : bsnjp1xt

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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 faw-;rftwhv w(ufg: 71qjy7k- octor when the frequency is tripled?f(w: uw7--hr1;jg qk 7ofwvty

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the c l3e*pq np-8lyapacitive reactance of thay l3l-pq*p8 net 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 andp2;x 5/5qebi f9 plnhlbgc54i capacitor in a RLC series bl f gpb5n9q 5hcpx45e2i li;/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 defined achqr;6dba 8;x s $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increaaw42k3bt 0:dfn4ops bx 9q1nd ses. When is this st9df2:1px0nwk4b3 b 4qnsdat oatement 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 the7 s9 act)*e bpqf4j)de 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 8 ts: /zfjpj:wcircuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doubl4 v /p-;fbh , wf.na6cym/bzrpe in an LRC series circuit, the resonant frequency of that cir ;fvb,c 6/-/fz.bm p phray4wncuit 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 resonance, -zkz--tlu1pv r:,lmttwdk*o0; (m sv

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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 RL ru:bgzpem.by y1 -4x2b2+ofs8ekz2 iC 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 rotating in a uniform magnetic field ohbn4 xs (7vikz49okk+ w2:by hf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag + 2 k4iy9kob7b (kx:n4zwvhhsnetic 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 0.1;pyt 2bcw*7dgc)xl ;u4rx l(y 0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneup;*(7 lcy);d4xrwx2y gb ct ltic 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 mhd8 *-tzzs5o oy-p .dx is rotating in a uniform magnetic field of 0.20 8hz.-x d5ty p zd-o*osT. Find the magnetic flux through the 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 arep wj myof.np,c06 dw+3a 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 coi; o*.pxzm 3joq* xkh6rg+r8ull changes 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 siie h)0mn ,7onbdfcw9r nlr ,7.des 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.5n.r ,be dc7nlrni709w)ohf m,0 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of mw+7 bza+ fnu-/hfn2r$0.40 \; m^{2}$ 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 area5ju8 e cnv;*fpgejj/obo+d kq67 ,+qx $0.20 \; m^{2}$ 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.tyt5 f k12:o7wza dt.gvp)kh at a location where the downward component of the Earth's magnet7 d wt): fvta2ogh py.1kt.k5zic 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 conrp27l3 wtylpq l:3- vpstant angular velocity of 2.0 rad/s about a v: v3pplq3tr-y72lpw lertical 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 loops and a cr3op/flb+)aq8 ),z wiex+ jdya oss-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 ww;l*n 64s zomu u z(uw-t8vg;turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its arnu.(zuu yt s:b2ea -(m/ 1yxqdmature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magneeumy1d txn a su-z2:q uy./b((tic 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 area4v*0 xstlha:*qs( hg av2)g+ebyju 7 x $0.090 \; m^{2}$ 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 construct1)9y(j h7pm msl6iwfj a simple AC generator with an output of 12 V maxi hyw m9 s6i7)j1p(mjflmum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a g5byx(lf cxecw3vz ,/x e) z.z8enerator 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 motor1coz:o7 ej-wy0gdvev7a 7n)a 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 resistance of 6.00 W. The motu9fm* zdl 8t0uda92eg or operates on 120 V AC, and when running at full speed it gen* 8ug2ez ldam9ft u09derates 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 internaut, 8u)vda.+jjd q0enw)(w tel resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. edjwq n80 j.,du+we v(uat ))tWhat 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 13e)eqpu i7 kj24-V power supply. The operating current is 1.0 A at full s 7jieeu q31)kppeed. 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 ism-zq/*c nrt vfu0 kyw:-n v(+h 5xncv7 connected to a 24-V power supply. The operating current is 1.0 A at fu5vrv 0w n-qxcun*tmy/+h7f z(n v:c-kll 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 ,.fxfzwp bw kt-4u9uvo92it+ 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 causes 14 A to flow in the a -znn+ltn4j*secondary. How many turns are in the sealn-*zn +tjn4condary?

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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 1 (vk)rht2r.6 1iiigi d10-V primary if the 24-V seco6.hit2)1iki r (ivgrdndary 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 primarynf 11ben2,m ch.seeu4 coil and a 2000-turn secondary coil. If the current in the secondary is b f.su1nn1 he,ce4me2 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% effici cw, vb2i.p7yu,j1eud ency, how many amps at 24 w ,1d.7 ibuep2vucj, yV 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 pro y6hr/ ai*fa/mvides 7500 V at 10.0 mA. The primaryma6//rhia f* y coil 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 prim )mi2 2pf+cs ,0sadr,negycyy)i/ kl ;ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thcs,f n2 yl0c ;ayr), ) pemygdsi/ki2+e 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 turosjfw2z, q; h)ns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?o;f zhjw2sq,)

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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 1eb+97:mmf-6 -qije il 1yvoq r00 turns and its secondary has 200 turns. If the input current at the primari:1 qeo7efb-+9j-vy 6 lm mqriy 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 andgj7.m ed ia2butb;w 13 its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expecuige w; 3bbtd a.712mjt 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 100vc)go(1w gj a4-1ekpp turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expe1v-g)c(1pwg 4kja eopct 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 0 j).k iimx*kzri 44cxpel90i5:oxaaV. 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 20j)0micakipzx.5i9o4 *irxe0k x l a:40 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 voltage is usually euth qr+fv5,h p7 9d2gstepped up to 4500 V by a transformer and transmitted through a power linu+p5,v7f9edqgt hh2r e of total resistance 1.0 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 sxs3 lyj3(joy /tepped up to 4500 V byy(y 3jljos/3 x 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 resistance of 0.60 W. i* :h+ayud2kzA 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 wi *zihkdu+ y:a2th a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanpklrz6f 8+k5k ce of 0.60 W. A generator produces 100 V at 70 A. In k+8k fr5kz6plorder 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 would fj2c. fq4far1y)8i8dit ;y ;-holtp- 3 wqyxjbe lost if the power were tran;oy-f8rc 3;y4 )t xqy 1j8lfija2 pfwqid-.t hsmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is mrj+lf6-nk/n wutl6 8440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage 6/ l tu-8mlfk6nn+rwj 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 currentsbvk 5c(ak2xk)lgvmf h +67 7r of 5.0 A. How much energy is stored in the coil's magnetikv75+6 ah(sc v 7xlbrfk 2)kmgc field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductr3qzze u6-c 5zy:gm;x or. What is this circuit5zz:3;zmrc -6 guqxye'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 8ml3 8oynj.eq:8bau j s:qu f9AC 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 peak currenok ;)e8b 2j-kwxkc c;rt?

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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 res1znzmax7*ijqlj r9a4y nktd1le 48(f9 b o(/iistance of the lamajj(yainfq *( zb94en7r/oz l84k1xl t1d9 imp?

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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 co e:*hxcb o0nlsd3ck94nnected to a 120-V ac power supply. What is the peak current through the resisnxlk b0d:o943h*ec cstor?

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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 1o pj.( ;ppv;,jmehr6f20-V ac power supply. What is the power dissipated in the v f;( opjrpm .hpj,e6;resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto1wzbu3 ;fz, xfr 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 i32khsfepm0 t: wa )z1ls $I = 0.80 \sin (240 t)$. 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 resiszfd ra9- /lqq+tor 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 na0 o is7kuly/3jfm;260 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 Hktja t1xs h42(z?

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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 inducti50+r) pr1 hyigecm :z6 ls4pokve 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 10* 8oqnb4hu t ly6iemo-s.) k0o00 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 fp8k/nnqtpa8yo + ( i7nrequency of 20 kHz is applied to it8 7ynin n+qak8opt(p /?

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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, 60qxykih ,uslx 5j./;xvs99t n1s7(h wz.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 capacizk6: n:73vkspb :o eei/fge6itor 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 hawm / 9kkr/h-nag p3id2ve 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 capacitor have ap ,kuwc4zx k )wwib,et+6*/rj 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 capacitor be0b:fjs8y fr 7g 100 W?s f8 gjy07rbf:

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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 5p g.nr3 o n26id,h2 m(aqnogs..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 resistd f7r/z0ldu8c a *6hjnance, 15.0 W inductive reactance, and 10.0 W capacitive reactdulr87 ch60fzj/ dn a*ance?

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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 c7 6gah,isvhql+/sm g z8ea0c/oil, and 1.0-mF capacitor are connectg 7ivzeq8 sch+/0,s6glha/amed in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase anglibun 12o2ei)i 1 mnze8e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conn18b2e2)u ieim n1 znoiected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 2) c2r;bv7vwazw.au(j f shi05j 9dm0q0-mH inductor, what is the impedance at 1000 Hz(v5 ah.cs9bf;j7 d aiv)wjm0uwr 0 2qz?

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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 imlgs.p( rch7. ro8f sun :4uf8nductor, what is the phase(s:hun.rlu84po.f c7g r f m8s 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 withwy zh 0jn/wi;3jzyn22 a 20-mH coil and 1.0-mF capacitor for a to2;j n20wyz3ywzj /nih tal 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 seriesd8ntdx,jzd8 a gf0o +/;(si4hyo ;hjf with a 100-W resistor and 15-mH coil to ge/jx48ao0s 8dnd(;ogt jhi,; fz yf h+dt 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 5000 Hzookx)ok5p-7,bkita4 k(v 3v i for a total impedance of 400ik) k,okok- a(xvto 5p4b3i7v 00 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 avce h67y:7n0y5au n nut 1.0-MHz for a total impedance6ch v5u7:7yu nnay0e n 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 connected in series with a 20-mF capacitor. t 5 z00yp izv7w;j8jqt4tl 0zyWhat is the impedance at 1000 li 0;8w70tzzpjt5v0 z4tqjyy 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 i1sf1a :ut odt9-pnoyx0 b2wy9n series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?t:9a1b-nsd2oy 9yfuxt 1o0pw

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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 6kc1*.ie yi7z(tnf4n 7 pw ycw1.0 kHz for a phase7*4.(6i1y f w czyn7 cpekintw 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 a18 ypj,+p tkhz total impedancphpt yz8 1kj,+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 c9 fz3 xm-mw5h8rq1u 0wl2p bnwith a 100-mF capacitor at 120 Hz. What is the phacqb2zm m w3r10pxh58n -f w9ulse 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 Vqyashohc 2(3 v y;./drgehi9( and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seqhgs( /ch ;y3(heiro vd.2 9ayries?

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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,:l2ssov0z )yx3vshy i+(kr u( a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currenu0syvoxihksy3 s ()zv+:r 2(l t 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 capacit j),t :xov/nyu 2k7b(wfe *ralor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this a*2 nj,t u:/wo (lkr7be yvx)fcircuit?

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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 contb5j) hyby 6s*uaining a 50-W resistor, a 10-mF cabysyj)6uh 5b *pacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W 5ikz;-0)c2ymoyfr 6/ zrytin resistor for a phase angle o 6o/yfr;rzi)2y-nt0i z5 m kycf $40^{\circ}$ 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. Ate.0 a:9h/)fzjmkp5sucgm t9llrl y+/ what frequency should the circuit be driven in order to have maximum power transferred from the driving sou:p sjm9llh kl09+5tg/c /u ey)azm.frrce?

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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 0lf7f55/yx; ujc t tliac series circuit with 12.0 W resistance, 15.0 W inductive reactance, andtyi /f0u5;lxcjl57tf 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an qdweb30r; qztz/i:w.iq) w.xAC 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. Whato0nwq*dc- *ah84e aze ish84z ene0cwqao a-*d* the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 52 pw ,p9q7y1zu qps6p rnygh2:0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-uhns p 1 7:,r2y2 gw96pqyzpqpHz 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-mb.0t8qfby sre6 (z*v t1/h qcnF capacitor and a 15-mH coil in series?b(*rcvq.qz 0b /ft1nte6 hsy8

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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 serrgwy9vc7; z vxbvau27;-flx 2ies with a 4.7-mF capacitor for a resonant frequency of 10 kbcz9 wulvx;7;-xv f a2y g7rv2Hz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant fr wn i9pidcnksp53.g0e0b+sruz 7 1x4nequency of 10p7xc9 ib s0knwd s1ig 5+rp03nzn4.eu 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 resistor an xraxyj /-jw - g+g46*f fyxmt.ug:ak5d a 40-mH coil if the resonant frx.x mryu-t wykfa+f/g5ggx :j a-*64j equency of the circuit is to be 1000 Hz?

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