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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 flux xkd0ji.os e 05s:0yb.ek9 uzrexcept

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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 inducti5 ;efwf kwxwq 3/.z4juon 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 loz mf anp3 cn8-z0n4,nwxv17zx*e n4,prx q3dvops of wire in a coil produces what kind of change on the zrvfz1xxz* ev p ,n0n-p wqn8mc 47a3,d3 nnx4induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces whge1zbg/7vw/ n4*y fr1wqs pe3 at kind of change on the inwne gbyqvgwr 4171s/p/zef*3 duced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind o gr(b, 5f*daw 9mqeus.f change on the inducedmq9 5efbsurg a(wd .,* $emf$, 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 fi5bvg;/.90 b+w jmx 3y xvemxdneld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a ccv *wv h3 q(6e/ exnhcwk0,e(aonductor will be that which tends to ph/nvw v, e(xe3 qcw(ka6c*0eh roduce 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 held uoa5zo f7+sn-3w 2qoeabove its center with its north pole pointing down. The stationary magnet induces (when viewooasz u3ef7 wo+n-5 2qed 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 bn0qt)rw +*bymar magnet is held above its center with its north pole pointing down, and released. As it appr)+w*ym tbqr 0noaches 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 mag m pze fdz)(/t fo,oc;m3. 9t6hpqeu,onetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced c9)h6fetzum; t dofp,/pme(. o qz,3 ocurrent 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 fieldr7cx*uhagwh:wfzrj6-9 *u3 o vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced ca-rf39 jzgw *hx7 :wuh o6cur*urrent 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 kf 3k5v1xc+ c7y 6qwk +0rnuaqfield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current k q65nk 3fc a7uqkx1+yr+wvc0in 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 tx nj 5 t;v.n4gh4ew4z0e sg)cever-increasing current northward. Twoj45g0sw net.4zn;vh4x)tg e c coils 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 pol; ct(e7qsi1oiq2 h1 gae entering first. As the north pole enters the wire,eq1o2 1ciq 7;ht(a igs 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 angular spf,e ffj-*b4 s(oqhkf1eed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dowfbk (-of4,he jf*1f qsn, 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 speed about an axiwditl)j 695+vx ic/kms whose direction can be 6l t9di jm+5vx )/kwcivaried. 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.-imvh2w 8v7u4pklggryai hf1y,..m-n rgu 57
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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 th zp7 xk610t.:w jmjiinat 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 magncn:z+4owxi c 8etic 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 directiolcl;fv a xhef67e b2*,n) is moved northward at constant velocity through a magnetic field that points straighefc67va lh,x;e*l2f b t down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velz h8g1-x5o4agw.x s o.l fvc.zocity $\omega$ 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 transform+s xe*.*cc dmhs

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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 revolub v:t9oa0 oqq/tions each second. The frequency of tob0 qqvt9a/:o he $emf$ 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 devi*j5w gjlu8f*1 vjlcm83xvae 0o() wukce 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 d,sm (o ziq 1q-+ndfv;gevice 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 secondaryhk*3n*-pkwc+ngi asm ph 1hb6 -jz u*, coil contains more loops than the primary coil then it is **b-suinh j+gknwa1hp63z*h,pc k m -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 contyz.0,2bp umqwains more loops than the secondary coil then ,.wz2 b0 mpuqyit 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 p/2 syq ae/k5o8q gi:m cgwsy 6(om.j;cower 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 cirk+/ *mwr 1 d((qkoaczbcg 75py,r,vjocuit,

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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 connecw1*n w h hdx8rhpr+*4kted in series to an ideal battery of constant terminal voltage. At the moment contact h4*rwhkp+xrh w d8*1n is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in ser 5d 9.8ml9mptcb7 iqdlies to an ideal battery of constant terminal voltage. At the9pq8l 57c9 t.ilbmmdd moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit dj2utzlkk5 q 7bt d18/with 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 , 3;myw8h bn2enfq s 6op88uscd9i,zaR is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a bawqqz4.urk.z 09 f7y mwttery. The time constant for the circufkz.4qq r z.0y9wumw 7it 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 connectvd0xl *f ck+d(ed in series to a battery. The battery is suddenly removdkl+d fx *0cv(ed from the circuit. 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 samgq,8i ei-qc.hi b(i.8m.vjuue units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power suppl)yzk(dk cge6ty0h: y( y. 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 this circuit, the currenxe3 z7;0p y k+)l4i eszrwc2da)p + l4xr320e;sayz ckz7 edwit

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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 chaiqnz 1/w81b*3pndtm u nges by what factor when the frequency is 1iq nub3/zd t*p1mw8 ntripled?

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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 induls.zlq-o a nh.ttt7 47ctive reactance of that induzq ..h7ttst noal74 -lctor

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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 appwt.0 do)f c.oqroaches zero, the inductive reactance of that coi .t.) od0wcqfol

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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 powekk8 ( d.nw/o0)e5vwxd u 3iyqwr supply. In this circuit, the currev du)e yn wqw(/wk8xd k.035oint

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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 chan,tli oz(b.eej t)wr-1,tsc s1 ges by what factor when the frequency is e1stjz ctro-wb1 )e ,lst .,(itripled?

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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 ac2mfz) kyg p(fi 8;vl9o3 6fnctross a capacitor approaches zero, the capacitive reactance oiz(v) nc8m2 ; ygtf39klpoff6 f that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the in l6tvfibv79*ln 5g/uqductor and capacitor in a RLC sllu vqf/6g*nv t9 i7b5eries 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 ano18p d wokq,nq1gr(tw +a.do3ir9 5sx RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incr:dk +kx9lnjggpp 0uz,m(a08 teases. When is thidmnjg p9x, k08 kzt+0plug(:as 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 cir+:+n7+u ,kxq1ipy sizw9i c kbcuit 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 circuitapg:- 1gexso 5f:gus.( szl6g 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 do0i fyujoj6b ec fq,ej8w-0g( cgq2,8juble in an LRC series circuit, the resonant frequency of th oi-c0f je6bjgew8 j jfu,y0(g, 2qqc8at 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 y)v ut) 5qxf;wapplied 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 8j1hqjlyb pmuf 94*0jpy8pr: ,hnrf9 njq3b/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 rotatin,cu32gfpk 2zz c t5m1ig in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are pau3z f2kzgcm i2 ptc15,rallel.

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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 magnetic fielduwpadw :2agvx15h, o9hnd -dow)f4 /l of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are px,g)1 wpoawh:h-2dfn d49vo5lw u a/derpendicular.

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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 rag*;3 eskqcp +rdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetks*q pec 3r;g+ic 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 area of an adjustm)i3xjy42 n*ywy 8xhlable 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 l dpq13 qzdp3a3ncfu i*72:bo$4.0 \times 10^{-5} \; Wb$ 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 squavfy0o(yp:ahxd/ 3/fc re frame with sides 18 cm. A uniform magnetic field is applied 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 valuea0(ff :y/c3/vx py hdo 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:v2ou0yw*:c5x jp y hj 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 k.duplyl 51cwbgd5dqd86fi u 6s 4/x(and area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing k5fkvhsby3rk( 7y +ey (7y-k zspan of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field is y(7yk vsyr+zk eyfk k-b5h 73($6.0 \times 10^{-5} \; T$. 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 rrsfy1)rn.h:1*p k lq motates at a constant angular velocity of 2.0 rad/s about a vertical axis thq1r :).msyr pnhlf *k1rough 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 cross-se1zio*/lj fv-wxf a2 xqnih),; ctional 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 *oo pz2*19vml1n+vu upb/hpjturns 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 loop i;s (m* mjvnuvzwzp-;f/gfz2jd 3*3ji s 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 i*jzdjfw3;v/j3 zfi mp- mv*z 2g nsu;(n 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 xj ufc9ggt*/* 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 g1e-gbh3 ;jy tygd4 w k4-)l9yuo)fiqto construct a simple AC generator with an output of 12 V maximum when rotg)y4 gykj -li4fw;g9dbt-)qhu oye31 ated 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 -yrund9i5f )w generator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a rei afa( prb+l,o:bvzxc yu9004sistance 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 5t5ka:n i+xumgp-ctu r 4.7kkhave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fultc.k+ i5xgrnuu-:p5t 7k4 kmal 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 resistancvhvj8nez4 2; oe 6.0 W is connected to a 24-V power supply. The operating current i2j4o nz8; hevvs 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 power supply. cpu7wa8;2kau , cfc3 p1vuna2The operating current is 1.0 A at full speed. va7c; u u2kpf123,capn8u wacWhat is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powgp; k m:xiv7w,dt98a hw0(uhver supply. The operating current igd70v a,mxhwhpk( ;v8 tiw:9us 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce 8j0( cbm h0c:urwr*wpa 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 tranp6. oduubar)bksbh :2s0)t9k sformer causes 14 A to flow in the secondary. How many turns are in t)s9os b:p hub6krb.uk2)a0t dhe 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 turvgre+,ooq+k3bo7pdt ca4ggs p( :o: 2, chi:xns are necessary in a 110-V primary if the 24-V secondary ho b v 2xqerp,oop:g +k: :4agc +,h(ti7dgsoc3as 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 prrh3 hk2kz sc/n8lr3z;imary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whn hkr l3k/3 zzs2h8cr;at 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 prima: n i7vfp2ru+sry of a transformer. Assuming 100% efficiency, how many amps at 24 V can flownisp7 : +u2frv 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 85hg9/fdho3r x ds9bz a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does t d59b8r fhgdho3 xs9/zhe 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 p8s os-e 0nac: 1,wt9a)h-;3 unccwx uaju(tsxrimary coil and 300 turns on its secondary coil. If u-whoj c ct)uen ,a:uscws9x-(0n3sa at8x;1 120 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 ;fl w59go z5jeon its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in z5 g9;ole5jwf 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 hasmdzbu(8,x ,ws 200 turns. If the input current at the primary is 100 A, we can expect szx ,mbu8w,d(the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondg9x9byqd fh0g s0 xm54ary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bxf4h g99m5b0sxgyq d0e

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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 transng5,x sn/wuy)former has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the powens y,n5g /wxu)r 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 volzczwz e6vj 26.tage is usually stepped up to 4500 V by a transformer and transmittedczj6w.vz 2ez6 through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Thqxi4(w 8y: 5-(ta8a azc/ idkapz4muge voltage is usually stepped up to 4500 V by a transformer and transmmp5ax 8(44yad-qtcazzgiw/u(: 8 ika itted through a power line 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 uspf8q+6 bofs1 a,nt9o rually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage powfo1na+st b8f,6o9 rqper 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 xe-vpk, z r(1p6 k0xssn3wo)ztotal 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 percen pex),1xnzo3s-k rs(0 kv pwz6tage 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 ttp8 4,ou0dk7du7 55gpmzt ik long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 10075t k7om kdug,pz 85pt4ti0du: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 lrnqlsaf d;w5.54 yak8ess power would be lost if the power were transmitted at 3000 V instead of a5r.lf5sqwd8y a 4 kn;at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmit usm h0-ou/t(md hp6.oted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss .o(u0uhd mp/th-m6 osin 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. 0y;e,q- x m2rplb rop.hrz1i*How much energy is stored in the coil's magneti- x b.;y20z1*qpm orre lri,hpc 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 ,, ag3g)cptly-H inductor. What is this circuit's time con ,agt) p,y3lgcstant?

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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 Aq;-z c i8si9me bn)u*c5jqft *ejz8,cC 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 ACz.av)i q26c0xl ,cq19j uyi04 mpv v ndh1gj6q outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed ip st51 pzy(:pvnto a 120-V AC outlet. What is the resistance of the lam v(pp1szt5 y:pp?

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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 :htcyo5b(tz lrp :8; ipower supply. What is the peak current through thez; tcy o(thp:b:i58lr 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 to2s3,jwbd. a ts:vp ng0 a 120-V ac power supply. What is the power dissipated in thdt,n w2jgv ap3:s0s. be 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 af zs6 q x5s 7rpctmj2+i8p4iv *0bwaz( 50-W resistor 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 rr0cl-5ih 4gkfesistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is hg y.m du4n o6we:,oevxc44y+$I = 0.80 \sin (240 t)$. 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 ilx/jfrf.x/5 8euxy6a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of ,ye0h;8bm xpbuq hk11kj /)p8 au6ej qa 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 reactance?: ls a8eo -vi.f.9(powh(zve o

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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 100 t;7uunr9w(c8b2ta *k( edlu m0 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 3ks:w8xw* w 7a7 8rpaw -iq/pm pbh;usa frequency of 20 kHz isui-psp qxrm7/k7;88*b3wa:sw w waph applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50vc7pqc zs02by /.)dhk-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHj: r/gd d l3g0/7rz3jmrixel-z?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactanc*g / db4cc3blfogjo99e 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 10m*me c cm34zj: 8gr; czt8zfek.,h.ez-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF c6h 7ja o;m+tsao3g1 g k0kzvra-vlm65apacitor be 100 W;mvrok65zk0-7gaa6ma 3j+vsg1 toh l?

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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 Hz1uet 3 ad6uu .lmo3zt5 and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit i,ys;5n8sg a qwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive iq8s, ay;5sn greactance?

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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/ bclsi:qx0m /o ax9b5 at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected insq: lxa oib//b0m9 cx5 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 ifmviru.t oit qq/l;u:d3n*)pnre )6o: a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected 3.mpqr qon *v n;ri6ut)/do:iet) l:uin 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 i81+jeg )phzp,maitkj28lf/ kn(i pq*n series with a 20-mH inductor, what is the impedance at 1000 8* mpinp/fe2(jgp,81k khql z)j ai+ tHz?

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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(6i hx.acdsdi/s/2ams)je ;z7 j( mg i 20-mH inductor, what is the phase angle at s( e(7hma/ijs /igjxca;zds2.6)i md1000 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 circue8 v:acbg su1;;ds*livzo*1o+i+rrk m hy m4)it with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 Wdi4mk so vmcv) *y z o1rs+a1+;rheilu; :g8b* 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 a7q8ua d,ua*:znh /3dnd d4jax 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2004q,zah7dxa 8a dnud: j* 3nu/d0 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 45p uo1*/-jho j)ibbs k30-mH inductor at 5000 Hz for a total impedanc 3*pi )-bo ujo/bj1khse of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a 1iq*ft-.l -b v3/tkqjxt2oejtotal impedance of jj- ittk .x3e*-o 1/qlvq2tbf150 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 connecte )at pl;k8(qjbl+3 k8 usd/ascd in series with a 20-mF capacitor. What is the impedcd8+a/k( ;tbj lpk8)3 l sqasuance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in serienf cfq/yd,w.w pjl gw7f74s(5s with a 10-mF capacitor at 1.0 kHz for a total impedance (fy 7sgnwwf/ q5w,4lcf7jdp .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 neededi2zjgef.j a-rws 9:r mj h*4wzk4s+4 m in series with a 10-mF capacitor at 1.0 kHz for a phas 4+rz jwk :-ghm*44ijjrmez9. ass fw2e angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a yjjx)* 7ob6ar if(pq+okb9r- total impedance of 45 oq -( r6a x*)9jk+i jbbop7rfyW?

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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. /n(6yntpdd,(cdt;qc What is the phase angle6d ct,c(/ydnn pt;(q d?

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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 100a dmd)e )anzw78 rml;zbr9dt(h3e0cd ;l 8/yf -W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?7mndt) zr;38myeaehf9b8wr da/cd0; d lz)(l

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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-mo dsvle0b ,.qq(9 (nbmF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supplyqe9svq ml0(bn( b.do, . 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, and an inductovi;cw8-9i 9bn mff9wc r of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this n fv c-9w8b9fi9;w icmcircuit?

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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 cirfs32zzn2 elcnzi5t.9:c9 npd cuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when t 5zil9nsf2dc: z9enn.3 zc2 pconnected 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 mj2/)g vut/ iqxt0so7resistor for a phase angle of v/mot7j q 0s/)itg xu2$40^{\circ}$ 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 =dwci8gbf6.b nr x:9(w u +s9nk 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivgwdxi6 (9 u: 9bk+cw.snnrb8fing 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 resh .dnukrn ,-p1puaw0)h*: h nkistance, 15.0 W inductive reactance, and 10.0 W capacitive :h h,h u)d1-kr0wupn. npk a*nreactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit isq te a2wk/ g,sj.y.*ku $63^{\circ}$. 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 imped,zsl twtgaqa:x 33noj7ztqv * j*0n dc.8/ma1ance of 60 W and a resistance of 30 W. What is thel*g zqvc*0d/31 t,7qat z3jnj:.x8amonat w s 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 circui. rq66 nrrd2nzt containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-n6 .qz26dn rrrHz 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 av9+jeh 65 :5qlgwvsb p37owtbi5r r -r 1.0-mF capacitor and a 15-mH coil in series?5vsor blgirvep-q j5bw7539r6h: t +w

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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 i27beq. 2bx objek/t;with a 4.7-mF capacitor for a resonant frequency of 10 ;q .bxeb ot/b72i2ejkkHz?

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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 inse. v a(z e5tjdm 3za*ba3.7 84dnlriwductor for a resonant frequency of 1000 Hzt bd.s 4 zirdn75am3we38 j al(ve*.za?

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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 plan48:q;lo9 uyf4elmw xksjk) +ced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz ; :l 48qnumwkj9 ek+sx)fo4yl?

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