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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 qoga.qjh2)ygk sm87) fh52mp except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states 2,co-hjeew* ucyq+ 7jthat 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 my),o r,wd /z0gh76ggy a f7peof loops of wire in a coil produces what kind of change on the i70y/mgo ,f7wrp)d6g,eg zh yanduced $emf$, 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 mag 7oi rwgxr*,c;/4hgkxnetic field through a loop of wire produces what kind of change oni; 4c,wo7rk*/ xhxg rg 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 kindj3xw9iub/ 3gb of change on the induced u3 wbg/bx39ji $emf$, 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 ;5- hik vi x6rzcrb;k( 0j,emrfrom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a cons f)rzb4;/tn8defv , 1 lw+cxjductor will be that wh)vdl4rfcb zx, t;w1j/ +8fnseich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above ith6-zq5g;1zf) z z cunqs center with its north pole pointing down. Th5zh zz)cu1n;- 6gfq zqe 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 is held above ito5x/s z,)lvsyf* xe 1es center with sey) o/*lf,x 5z se1xvits north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a tablex76mn-wv dm6l4 wicx;1iko + k.5u afg top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?faxmwoin. xk561;6ku7gd w v m+ic4l-

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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 field z7kqxeb )2k1 avector points straight up. T1 k2x7)ekqa zbhe magnetic field 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 wheh9kd1.pi(zhi. rp5:s xp 9 cekre the magnetic field points straight down. The magnetic field disappears suddens1.krhe5ik: p(ch x pzid99p.ly. 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 lg+c dm ytt5 69sil.wm-ies on a horizontal table and carries an ever-increasing currm itl-+9m wdg5c.sy6t ent northward. Two 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 pole entering first. jc9vvlr56m5q7 nf dc- w7iz.l As the north povl7fjcn5c7mwi6z l r.5dv9q- le 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 a8p0f+ v-nu7k lceef/xn axis whose direction can be varied. In a region where a unifx-+neuve f8lk/f 7pc0orm 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 rop q )e(r qf23wa67zu,ybe,fpotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fi,wqb3y z p,ae(fq ouf2p6)7 ereld 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.j 2uqv-b/ x+-jye:ldr
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that ansakl 5sv;c w,1 $emf$ 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 sn46ftz-p )k/k zqj63 4 veosva magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moa,)f 4hd0w(nza duh;h ved northward at constant velocity through a magnetic field that points straight down. (hzwh,hf0) und ;da4aMake 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 angulaz-w1 odsud5k q*7zxu 0r 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 generatoz2 v5xvxfy/xh7n ,ka7 8 tg mtu,u:(fer transforms

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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 eachog7r;vs k)ydk l1;x3w q;h4b f second. The frequency of tk sk;)h;;41yodq3wb vlg fxr 7he $emf$ 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 devicag0a.nq v r+hxr+t-3ee 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 devicxcsf6oc/9 8di b.rr 3ve that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than thesjn4htnv(rs8j 4y l b+. 7syi3 primary coi7jt4 byn 8v+yss js(n3h4i.rll 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 m4bfmzanu8s m06 .)g keore loops than the secondary coilgszebm04 amk.nu) 68f 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 poet s0kkj gki.*4atx4qi t, 57awer 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 resona8h)zu.wlaq8u3+b zpent circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ide)ei.fitamper x pbc+ c 6/s2.1al battery of constant terminal voltage. At the mmci)x 6. 2+ef /aebppt.1risc oment 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 aq8xvcf6; b s8*ndo he(n ideal battery of constant terminal voltage. At the moment contact is made with the battern;8 x*v de8osc hq6(bfy, 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 connected to an pqu2vzs 5p2 c 6a,(;qhlnllwro)n g*ibu+3b 5$emf$. 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 resisty +jn(r4ob 2fjance 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 3hcc:a +)tei la battery. The time constant for tlcc3+ai :e)h the circuit 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 connected s+jk /+mw xl4qgu mj-j)z5k-n 4qg/moin series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decreasj mk ou+5-kwgl/njmx4q -qzgs )4j/+me 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 units excepvbqdcn(gj2r (m ppk)2 n3b)2kt:

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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 suppljssx p4nf0-l7y. 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 coaz h )oj +vq10 uun8w-7-bhvafnnected to an AC power supply. In this circuit, the curreno-17 a w)nu h0vbz8aq-vhufj+t

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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 z*pt vs l g;.,o+i*hyzwhat factor when the frequency is tripled+z*pz iolg.; h*svty,?

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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 a x- 8lcbvdh 3 v1-imax8p-)c(nza2 chvqiqz)4 n inductor is doubled, the inductive reactance of that )cl(z n-d cvq z h-v)q iac8x1-x8hamip243b vinductor

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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 Ais-ny.2da,mk c(,fp0 ias6 oj b*vm-n C voltage across an inductor approaches zero, the induct0fa iodsmb6n k,-i jp* yac, .(n2s-mvive reactance 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.p ry tujmir7 0mgw,;0/ In this circuit, the currem jtpigm/wr7 0,yr;0unt

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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 ciry s4abk nu ),w:ocf.d6cuit changes by what factor when the frequency iswfk.:bcd4, uyns ) ao6 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 acrossl)e6fty ov /5a a capacitor approaches zero, the capacitive reactance of that capaciv ya/)lt6feo 5tor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor inzwp;f,ok1 +i b*d5hxf a RLC ,f5 k* wxfo1;bd h+pziseries 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 a)r-b oo+vk3ue n 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 circu 5 w scqnvbr1i(u1,e;rit increases if R increases. When is this statemvuq5i1w,( ;1 enr srcbent 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 imppuyizmd27i* 4 edance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit i;c )yey9m ;np8:( /ilotdertoncreases 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 LRn.raa k-6p+x;oq jme 6C series circuit, the resonant frequency of that circuit wxp-6aq j+m;6noar ke.ill

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuu r9q/o fk0ga3dps)1 rit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs w1 :ryqqe )3/ wm-qsxjjhen

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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 w bgl-ap i5krmm0;)rczv)(v5.10 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 magnetic field vector m lv( rkg50cm;abziwr)vp )5-are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rot7k 5frzog1 ugs1x, re6ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plg6gsof,u151 rxzk er7ane of the loop 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 uniform magnet,:xr st,e.;y fa5 logric field of 0.20 T. Find the magnetic, o.,fa5elxg :s; trry 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 aj st(ibb:c/*rr -r3c ysb8at:djustable 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 cht6o2ku 7:x- qg(r,rc*d.kzd+ lz yah xanges 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 turnp ow: sp8ayri)2 gt25vm9*flqs of wire on a square frame with sides 18 cm. A uniform magqra lp yw)g2:im*2s ot58p9fvnetic 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 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 15qzczy-z3o( wke 6y- q- 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 and arefji;dtg w.;wm-y:/ g7pgtnm ; a $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where they w g0g23zi+tqnh m16nikm+-e downward component of the Earth's ma6m0y w1m 2i-+getnz+h3qngki gnetic 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 ah5:z) qij -.cfwwm-k z constant angular velocity of 2.0 r-c . izf5)h :wkwzjmq-ad/s about a vertical 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 50jwl,lue-1 ic) 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 of wire of area d 0bj182pd2 aozwg0nhtd9d 4 u$0.090 \; m^{2}$ 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 arm 2irad7-pm, snature. Each loop is 12 cm long i d7nas-r,2 pmand 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 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 ob2-b-pw) zzw0qpyr9s(.6 hnt5en6iysp ll*cf 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to com1yfq +2-wpgsgaghuww2u7;*b0 td y0 nstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. Atfgbs0wq gyh 1wa7-pdgwu +20 u*ym;2 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 gebvsr/5o3 au/0)mjq/ i txnz l*nerator 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 of4dd8oa2 xiqa +a-axg) 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 oa+rw65l9 pmf resistance of 6.00 W. The motor operates on 120 V l+m5rfaw 6 po9AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resi mfzyfma.:d4o p 0z2j0stance 6.0 W is connected to a 24-V power supply. The operating current am m40fpfz2 oz.:jd0yis 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 y:)k jbh zu)jf;3n v5zresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A:zy)3z5ujj vn) h;fbk 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 resistancewkl1*mc syxk+) zdk-lp z5-hzoc .l 0) 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spee-k *y+pmlzwslh- zlxd5.c01) ) ckoz kd. 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 reduc f.idnnhm m1 ; ,tx-xbi4z1p6ke 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 i to pji ts:g6x-e;uh3 aa33p bj,7jp(causes 14 A to flow in the secondary. How many turns are in thptj p3g7x3,ja6e;:bh3jo ati(i s u p-e 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 turnkvcm(1r c.5d as are necessary in a 110-V primary if the 24-V secondm1kvccar5 . d(ary 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 pxmg rw .:x2p4rrimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.g42xpr:wm. xr0 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. Assumint/zmjn ;x1 4+ yp-wimtrd3yy 1g 100% efficiency, how many amps at 24 V can flow in the secoir1yp3x tty nmmd j1wz4+y/;-ndary?

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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 signrxh4c v25w+ vz vw24nh transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the2wc 5 xw+2vnhr4v4hzv primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secon ):y rho8 lnb;e2sq hd62e.gczdary coil. If 120 V at 2.0 A is applied to the primary, whatqh )z;r s6oel2dc g:beyh2n 8. 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 t,)u(ai 5nzpc(/gvoy y*cq *w 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 gucyt* ,/ o z)qv(i*yacnwp5(A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tu zbvn8op-h arhl(.6/)y*qe i /vxdoj- rns and its secondary has 200 turns. If the input current at the primary is 100 A, we can exv8/v )l bh/orxod(qy- h.6eanz*i-j ppect 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 seco.nr13r 2ty; zr 0mk..uqaab hrndary has 200 turns. If the input voltage to the primary is 1 k2amr 1bh0yatnqzrr .ur..3;00 V, we can expect 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 100 turns xq+ b0or*hpf.ag(lo *t udr+; and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output tu0qb oo(l+ h+ g;*xdr.a* prfof 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 fsq. 4j2uc j:(vhc3gbV. 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 primaq 4 cjjfgv2uc:s h(b.3ry 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. The voltage is usually steppe5i :z ,wgub of05wgap1d 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 transmissiguiw1wpo 0f,a:5g zb5on 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 u.ik,ytsa e): ;+uwovat 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.kw)t i;ovu u+.,ayse: 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 k aer31zzcpuzqw)8ncr (84 ac 3m 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 wac3 34cn1(pcwzrru a 8qz)8zeith 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 s nzdq-k3i6drib228 rljvk, .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 origi3irv8 d,qdkbk2l n s6 -.2zrjinal 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 powem043piwi ;lec r would be lost if the power were transm l;pwi 30emic4itted 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 on udztr an*,d-:4szj)w a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a tran,und)a sw-zt*:4 zdj rsformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5niwavs0 sn+h:er4*4 u.0 A. How much energy is stored in the coil's magnetic fiel4e40 ni:hrs nav+wu*sd?

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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 andn b -(rrxbsn7px,f*duv0 d ;-j an 18-H inductor. What is this circuit's time con-,07jxd*nvn pr -brsd f u(;xbstant?

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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 circuit jo/j. / rty ygm/,;qbcwhere 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 cue,gjmr-aln-t vxsk (:ton ,-5rrent?

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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 resistaf95gru /m x -il *gbmst;w36x z.ibu.jnce of the lam ubx-5;ugi t3/.m6l.rj gbf9w sxi *mzp?

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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 peak 9bwl49 bak k7q50zvhrcurrent through the resis5 094lvb z7qr9b wakhktor?

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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 supply. What is the power dis7) myctqs+ 8besipated cq)syte+7bm8in the 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 resistogxs2rcgp+8*h+w + ggir 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 rew ,vz fjm*p3-,cce0mlsistor 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 resist mki9whrlb-. 9oew,k (or 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 atyk*flxp a( 7i*p:g7cvl*t s5.by0 usr 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 rea0t8lsk8g4x t+)o r (oby4nsm0q edmd3ctance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactance w(4xf8 cdfvewdn9ux d502v4l?

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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 reactanc1bhs 1et-3ze8hp/g tw e 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 s/r(nnmd3s1 r V AC at a frequency of 20 kHz is applied tssd(rnr1 3/nm o it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz soumi5bae o76zec/:(oc zlj (;w irce?

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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 .f ll8p(gshiy8*me9s .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 isqgid3nx ae .)sq :db+8g1y 4ln needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have* t:wj.u qq*su 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-mFgyruj) a1;b beaxi q o17kd4h)m j76s( capacitor be 100 W?)ju j 1rokih eb716 7sgba(;4m dx)qya

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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 07kwaggez;fnor,( :rv.tfo )93agx c(mb w 0h/.0010-mF capacitor 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 circuit with 12.0 W resistance, 15.0 W ibi3yo.qiw2 ,p nductive reactance, and 10.0 W capacitivib 3,p2qo.y wie 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, anknho xp1; 8oj9d 1.0-mF c;nox o8pk 91jhapacitor are connected 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 Hzea/;ppj 3f7*l 2iz wfs if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conn;l/wfif 3s a7ez2ppj *ected 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 wd 1* ck;spiwdnm1vdfr5 ti,, )ith a 20-mH inductor, what is the impedance at 1000 Hz*r,kctp ,d m d5v;sw1i1df)ni?

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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 0p+ur(5 04ipudast1s9kgdvy is connected in series with a 20-mH inductor, what is the p i(d5vdkrt ua 04ppsu1g +0sy9hase 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 n u0oz 3r*ymp4weeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 Wrwuzo p4* 3m0y 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 capacitanuxw9w zc t/5e t/ip:r5ces is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W atxu:zrw 9ttp/5ec /5 wi 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 54 ( sr cizokuso6* 5 yq10)uuilvemc46000 Hz for a total impedance of 400006u1oolem(vy 6c cu45zqk4ss *ui ir0 ) 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 3 u;cfy*l5znvrpob 8aq*9(uf put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kWu5 r98f*(uopnvfacqy 3 ;bl*z?

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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. What is the isb8* dzmranca 5vjr6y0 b.**i mpedan8b6amrrnsda5ibcv0* z y j*.* ce 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 w5fghe 2.a44 /ns9yhwwaf1g8hrd9 mieith a 10-mF capacitor at 1.0 kHz for a total impedance ofin9/8rgam g1 se5.hwd2h4y ew f49haf 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phas hiap*lov t78*e angleha op**i8 lvt7 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 k6x,kx bm(5qcu;tsqh0g4a gz: 9ch5qfzf 7 k6uHz for a total impedancbc ;9h7qz5qqzs5 0: ,akmxgh gx( 6f6fkcu4tue 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 seo1 n,peb;c4: ijwx.*cyzuy) jries with a 100-mF capacitor at 120 Hz. What is the phas;1.)ynxei4pc:, bj*wzc yuo je 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 100l 8yy)4;jv/ 8 pbpflbe-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie ej8pvf;48y / yl)lpbbs?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, anfm,qghq, 7 ai;d a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the cf gh7q;im q,,aircuit?

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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 inductoriw 7q.y) toc:md r8iq) of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. q.tormi 7d ):qic)8 ywWhat current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containi v96iyz7w -i1krb3cq:e e p(envf +s-fng a 50-W resistor, a 10-mF capacitor,:c1i9vvbfznrw+eqs ei- f3 k7 (yp e-6 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 tao;j 4r8(/w.sh0lp fzr1a sna 500-W resistor for a phase angle of at.ssr/rnhl4w 1za0j po;( 8f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At whatzc ;*.2q adfmfd ,r)jh frequency should the circuit be driven in order to have maximum p*jfrzc ,) .a q;dfhmd2ower transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, s9u/ sjhneu0tpt2+9r 15.0 W inductive reactance, and 10.0 W capacitive reactau20 9uthsj9/ n+stepr nce, 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 ci.gel (1jbca8b rcuit 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. What iyd6zqnc5(hd-ax 0dy; m 6h/ zrs the power fact5y z;d-znhy d/6xr(a60dmh qcor?

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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 containin 3.4sb;jyyz,64flivqg a aq( rg a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poga ayy4f6sq,qz 3i; . rj4l(vbwer 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 q/vo4tdjgc4rze6oh72yvs66 w s8 ip;q/t c ,mcapacitor and a 15-mH coil in series?g sv 6o/iq/c, t 4qtr4meoh6 p;8szc djyv7w62

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-q(;ey+kknj+w mF capacitor for a resonant frequency of 10e+kjk+ ywqn(; 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 ium, .eoql2ab.z6 v9tznductor for a resonant frequency z6,z9blm qa teo.2uv. of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in seri+1 4,luczjatq es with a 30-W resistor and a 40-mH coil if the r,l 1+uczaj q4tesonant frequency of the circuit is to be 1000 Hz?

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