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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 l du4 vrw.zb59are units 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 stateseuyuut-5pkqh 6yd + 1 uj4wg40 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 coil produces what ki/qnluz r1;(3qn jq ca0nd of change on the in (j0/1nq;qlarq 3n zucduced $emf$, 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 strengt8 (wfj /)umetq on;uxr;f)wmp0:0 z l6dpcr.lh of the magnetic field through a loop of wire produces what kind of chane f)f.u;/;q8)rlrzjxuw:m mw0ltocp6 n0 pd( ge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of cu ccw+92yp n7jhange on the induced c29u7 pywjn c+$emf$, 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 fid ke,ls5wj811s t6/7w9bwd ky. klvjseld 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 currnkzmfy(n: t 11q dmq5mxxiij/a*.8d6ent in a conductor will be that which tends to produce which oft m5:yjaq/86d1dkimxfmzix n 1 *n. q( 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 a 6q *aq4en-t 9*umztyabove its center with its north pole pointingq6tatmu4y na *z*e-9q down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet +:o904 aet*5 rmqhzdv wkg5j pis held above its center with its north pole pointing down, and released. As it appr ed+p5m*k qw5atj 94vrzg:0ohoaches 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 )du9cg/xnwi: pk9b u .tgm k70in a region where the magnetic field vector points straight up. The magnetic fie 9gkgpmt u:b9ux07.d/ ck )wnild 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 to5qh itm l4a8zrq*ddxcs5kl .9b6 3nf5p in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as t *6qs r9nc5ak.z3q4f mbix5hdd tll58he 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 thekzuu4 as.*3l ba lwb1- magnetic field points straight down. The magnet- lsab bu 3a*w41uk.zlic 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 j vw3(hl:t7yhlies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above7:jtwhy vh (l3, 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 3t5dhpc;yj/gg qz x z)0y.yn*first. As the north y c)hg/jy5g*nzy3xzt q.pd 0;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 angular speed about an a56 h,iq etfg5txis whose ,t5 qg 5ei6hftdirection can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 y0s 3ypz0vpjlzri8. . constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the os .8prvz 0 y30.jpilzyrientation 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.gl)*3smyeu0 4a 0x6+j hud ud.lpluc saau)62
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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 y00roscvl 24 hb/d0)owce )ifat 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 fielx2 w( d6orhs i5/u4dohd. 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-westj zfxibb7l iu39d7 rf;):hdu/ direction) is moved northward at constant velocity through a7i)buuf ;lhxdiz 3bdj7:/ rf9 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 rotat6+mqsc5 ny+ys36c0w .qcxa g/mf 2x ooes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator t vzpu):nych ci982u88 st .kpx j-fs/vransforms

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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 revolution avb8p e p9zf /qr ua+2.yhmr*6k.mv5os each second. The frequency of t.m5 ra bp* f8a+y/v.6e9v2h mqupo zkrhe $emf$ 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 c s6l2z kl)tk0used 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 db8:b /k+vq5r3 i a vnc8mjfn0mevice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil containsv-dn :ew/*g eibp1j2w more loops than the primary coiwn :*pev wbi jg-2/1del then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secou p9r 3viz6(czwt j.q.g t4mh1ndary coil.w r4h19cj6 g(pz3vqtum. izt 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 inpuymf-*fd :w + 3js 9mna/kis*twt

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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 circ/ho2 8fjmop w1uit,

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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 battery o0u 7de.xfcb3t ir3 ob9us d;k-f constant termina f9.csibddx7 o3 3uuek brt;0-l voltage. At the moment contact 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 series to an ,x 4-rc3nb:z b-njpdud r:3+r4xx mi lideal battery of constant terminal voltage. At the moment contact is made with the battery, thmdn z4dr:rxpi4 lcbx-u,3+-nxrb 3 :je 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 tdkhoq1tusthdr*b )*-d4b1 dr- t h2- 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 inductancc:a ybw qn; :)9f+ nxc7g fln,of3u/x/seyh2oe L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time const2kz1g*z n bzhq+3zu)xant for the circuit represents the time bgzk1zz 2u+xqzn3h) *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 battwm3(2w h 17 kukadwr++*ghslv ery is suddenly removed from the circuit. The time constant for of the circuit represdsl*3vh1 ++ugwk(w2a7 wh mkrents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unitqc/ cf..1dqb *jx: vhh -srni-s 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 tfs4;r * tewl2t1g7cjpower 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 tfge3r5(vnr9z75t wr fhis circuit, the curren(f3r 7nrew tfzr9 5vg5t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the f)nr vxg:t(3ws requency is triplegxn)sr:t (3wv d?

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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 tgsrq(5ckuc6v t1p -- inductive reactance of that inducsvtrccgq-61-k t5 p u(tor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, thnn444bv2 ty-du rffs:e inductive reactance of that tffbnn42r d s:u4-y4vcoil

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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 a vdq6 cm6+,pddl-6/hjea;tx. In this circuit, the currenlqavmd-6cjd6 t/pxh ad6e+, ; t

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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 circui xgb/)o2* 9vho (dbmcwt changes by what factor when the frequenc29o/xm*b c(ow)hvg dby is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across cdjkxa 0gggz8bt+6/ 9a capacitor approaches zero, the capacitive reactance of that 98gx0g+j/z ctb ad6gk 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 voltageuxx zju13 ib5m pa-n2b/*4h cxs of the inductor and capacitor in a RLC seh5a/xbxc1 un*x b24mju p-3zi ries 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 as df3 fqibr kh88)apm(1 $\cos M = R/Z$, 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. m;bf1z+q m *qc (mbs(a The impedance of the circuit increases if R increases. When is this statem ( q;cazbbm+s1*(mm fqent 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 g8 pv +p-gqy7lincreases 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 cir rfg+puh:awsh2c+..scuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, the jlr be*/wwln3p*a . d)1/tcc bresonant frequency of that ccla )ncjt.b wd 1*e3r lb/w*p/ircuit 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 applfd 11 nijtn*u9.+l zybied 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 circuit 0 . n 5(6kbr5lktwkrwdoccurs 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 g e lhvq u638z3;a+fmhfield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are p gzh;vq+3m6u e3 8alhfarallel.

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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 field 1( +vcvtnta; n7ros4u of 0.20 T. Find the magnetic flux through the loop when the plane of the loop1ta (+nno trsv4u7v c; and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unru,6r 6g ez)al ;yllm.p lunrs ):9pt/iform 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 at an angl l l6r))s.arppu ge lyz,69:nmul/r t;e of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is red(tj4z;ofo )yluced 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 fdiidpz ;1rr2 +rom $4.0 \times 10^{-5} \; Wb$ 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 tun jxg ;enu;kwf akr0w0dn)*a (md)l4vv3gm:5 rns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field c4 k*(ark; fd:dv)jm nl0ngavg0x) en;5wwu3 mhanges uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 1u;+ 1k7sqf 4x jqy8sgl5 turns and 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 an:b;aiq8lbx.mma co * .d area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizotor:0 )ulddh .2 p)zamye-4 centally at a location where the doyl.m o 0:4ezadtder-c p )2hu)wnward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angulart lycsm (6mfwn /2+)io velocity of 2.0 rad/s about a vertical axis through one of its endc+ )y 6notmwilf(m s/2s 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 genera.ov i(,/bxurntor has 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 turns obo8x;x l3 7nfb n 0y 31qmawzq00d*pmnf 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 7ciiwn 5 5 ex4g04icmip.e m8tiy/g1ploop 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 perpendicular to the axis of rotation, what willxwy egmg840 iepi i/714.ci t55nimpc 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 tume2vjk3bsb2 3rp vk;i7 e31qcrns 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 withv tvo+-7y sn edqb5t6v1x mgs: 3.jr0h an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating cdqs7xb +t6.vsnv5-y :1hre0 vo3mgj toil 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 gener svfw lzxh(j,:*/yz n7ator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor olho4b+519 niwq n9hblperates 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 resistanc3esp q4vx;q f4w8m j:ae of 6.00 W. The motor operates on 120 V AC, and when runv;a m4wqxjpe 8f34s: qning 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 e5pt8r0vik z d8k3;ma to a 24-V power supply. The operating current is 1.0 A. What is the start-up currente 8t0v5k pz;rak83md i?

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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 20 nqlolt* ,hs6.hupkuc ;ao 6a5d, r7c4-V power supply. Tho u7l l,5p6nutca kdo,.ch06ar*qhs;e operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. (+hq vphbxjb8rkkf()93 m-l p The oppk8-f)( m(bxh3 rk9ql+pjb hverating 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 is needed to redr, qow1q*7wawi( 3c mhuce 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 floge94g)q4fsg f w in the secondary. How manfgqf)gs494 g ey 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 arev)16ssoi ud w) necessary in a 110-V primary if the 24-V secondary ha1wsi u6 ))svdos 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 consi 4zwai(.3ewimj5 ko/t2 3aepysts of a 500-turn primary coil and a 2000-turn secondary coil. If the cu54yiewjakmz 3/w 3 ae.pi(2otrrent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of c63vc )4 g(i bhdl*66 )lv ikatjzq(hna transformer. Assuming 100% efficiency, how many amps at 24 h)g vd)jqi4(anl zi (*k6h 6c v6btl3cV 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 sigx2qc np2u/v( bn transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does(c xnbu2pvq2 / 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 j riez,+ 5qp:m60 turns on its primary coil and 300 turns on its secondary coil. If 120 V re+m5 zj ip:,qat 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 on its 7 rszb7q:mm5o secondary coil. If 120o m:m 7sz5rb7q V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformerym* x /pwxb 9hdgy7j96 has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect7g*p ybdwx/ x9y96hjm 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 andpc)* m mend40d its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect m mep)0cd d4*nthe output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary-v kb02vf l4l.5nicbwj)4oozo e4 0 fh has 200 turns. If the power inpu4b wk5o .2f)fcv4 bn ozj0hi-ll oe04vt to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage/hkvr *cpx3,df :z(zn is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numbrp/hn, (z :xzkc3d*vfer 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 cu,1 u+-vcd ceuz. m8ug ge-evw+rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.zg+ vecudv81mc +,-g w.ue ue-

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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 curre 1av a8i2x,vw;yxkoc 8nt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find8viv x82x1 ;aocaw, ky 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 line0:2ghfl h yt0g 50 km 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 100:1. What percentage of the original energy wo hyghftl g002:uld 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 resistance of 0.d:lx(zfxp8ct buzh 4x k 904d060 W. A generator produces 100 V at 70 A.x df4 t9u0 cd(0p8hlxb 4zkx:z 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 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, im v2 b-u7t0gak4pvm at 1000 V. How much less power would be lost if the power wem4imvubt- 7 v gkp20a,re transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted 6 v-zy m c-,5*gktzwymon a line with resistance of 0.60 W. To what volt6km vmy,-zcw5 ty-gz*age 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 carriesy mpf3fg: a63q+,hup* )a ycfx a current of 5.0 A. How much energy is stored in the coil'sa g:ycp*ahf3 fmf u6,3pq+xy) magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.u6hy,v:fvx)bw/g +aben g c(u*q h8 9j0-W resistor and an 18-H inductor. What is thiwh gy( /8 xg vav*fcn,b6:+u)uq9hbjes circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circadr 8,0sb;apwuit 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.k flsr p99l)5bj ar7*o What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of /8ah qt3yv9rtthe lamph/q y tvat983r?

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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 is the 9-g(zqjpn x6p peak current through the resistor xn6( 9pg-pjzq?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power s)(y6 ) esxfikgupply. What is the power dissipated in the resistorf(6sex) ) giky?

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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 resisto062sd refbwn6r 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 x *8z+mmce,+inxqn. x 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 resi .9t+kzdmy g rqidf*ky; ff+r+6q8pa+vc;l,m stor 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 inductc3 z4yqfajpg9qbf z-mfx 1. .2or 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 jan l)oy+q6y ,fjx8l0a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wil i*vl /frfeocc6v4)*uzd8e 6ll a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for u 0ob uy,3woudx.vk9 +9odw a1157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency oftqy48ddl6x ow1i+. ym 20 kHz is applied ldomy 1+x 8w6 qid.4tyto it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to efy,.n(gv d +r-(jyb/s9fzeua 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 8jwy , ek5bdk9a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHz?9hswjp y ,c37ns.7h ks

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactanc 8i(3 orc:wffbe 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 capa 7th-c0rrax 9ycitive reactance of a 0.010-mF capacitor be 100 Wx9 yrh7rat c-0?

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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 c9s, 5px:om ;vp0c3wqb6 omgc bapacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series c.0 ugwirf-5r yircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 yur.5fg -iwr0 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, 20-mH coil, avsewwp7rf.fqma33 o6w+ -z a2 lm.x k)nd 1.0-mF capacitor are coe7la6f3zf2 v) k-..arw3wspmq xw m+onnected 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 angle at 1500 Hz if a 100-W resistor, 20pki25ww* w:rm 9k1j0ha4r l gr-mH coil, and 1.0-mF capacitor are con wh45gmrj20p wwl*r1kia kr:9nected 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 20-mH ind0l4rv8h fs v6 a,:oooxuctor, what is the impeaho:xol6of s r8,4v0 vdance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is thehxwjp i(8m0 a( phase ai(0 jax(wh p8mngle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capacst0+ko t)i. e2dzbr :iitor for a total impe tiz+0 sk:bdr2.tio)edance 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 ne es8mbqq .9f.+l cnw27lv2edkeded in series with a 100-W resistor and 15-mH coil to get a total impen22e. vlcle .kqm+wbd87fs 9qdance 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 Hz for a k k:y6i3x ;hmftotal i3kxm yf:6;ih kmpedance 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 tv8njj+ lh ,;k/*kj ksootalv*/o lknjj,j8h s;k k+ impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF ca+ka t,) f wp/ 1g:r6/cprr 4npcnzd6:nmfby.opacitor. What is the impedancena/c p4ob/fzpg., r6mtk6r)1:cf:yn +d nrwp at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mFfpgz7z/*y5lxl.e 0c 1ok sy*l capacitor at 1.0 kHz for a total impedance of y./ko0syel z1cl z 5l *x7gfp*45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10rs/f9dlcb ,i 9-mF capacitor at 1.0 kHz for a phase angle obi9s 9fdr,lc/ f $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nmn9d4k i-dha y7t 4/qag7u1(jdc v6r aeeded in series with a 30-W resistor at 1.0 kHz for a total 4dmvj/dh1 dun6qc gy(9a 4ta ak77 i-rimpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 10 vhu8uf :wr /-n*puxvjzn* k 987wwzc00-mF capacitor at 120 Hz. What is the phase9-u xf7k: 8hwzvujnw8** 0 v/pzr uwnc angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, aid0q os.g3fnkf ;;+ usnd 1.0-mF capaifkn+s0o g f.; uqsd3;citor 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 con;bh)-9u3ahrz g3 djb fsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. fh3;u bbrzh9)d3jg -aWhat 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 reactance1rco( uiqzoaw l5;lz*+k) p2j2+ vuvm 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flowsv o 2ivzzc+)kj;aw2pm+1luu o l*5(rq in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, a ysese g0r.; (v10-mF cap0. vregy;ess(acitor, 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 kplh+vdlfr8+/( -rt q:; zrunlf 2t/e 500-W resistor for a phase angle oflq:rl +pn;-e(f/rv/lk2rh t z+ td uf8 $40^{\circ}$ 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 haa:r.0vnp g c/m:qyt1 as R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferredvy:gc/: r m aqa.pt01n 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 resistance, 15.04,nti0t+rj0k v ls6vz,u qe:)e +nyee W inductive reactance, and 10.0 W capacitive reactance, when the circuitk)nvzlq+t+ievy6 e 0tru e: e,s0,4jn 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 q:kdtiwcaph0+oj ug yw0 + je2nvm;q/,9)5 sfAC 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 imec .v0y fv +orustn(z- f+s/d7pedance of 60 W and a resistance of 30 W. What is the poy-e0fv .d+/7rs+ z c(nsuoftvwer 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 contacc t0i2r8 19violne+qining a 50-W resistor, a 10-mF capaci0o vitcq ec+ 912i8nrltor, 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 an k -una2sf e7mdpfiy*0sh036 6tqsvn 2d a 15-mH coil in series?afsmssh0n6ki30fq6n 2* td7 2v- pe yu

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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 with5g8 ;frlzao h mwx)n20 a 4.7-mF capacitor for a resonant frequef20z)8 xw5 ag hol;rnmncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant fre/cpybglfb m,e;-0u p eqb)3et6e;z; xque/ e-f;06xuzml;p et cb ;bpeyq,3g)bency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be p1 g8xjof-q.u placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is x. -f18jougqpto be 1000 Hz?

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