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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excepw 5 ormlyrwe 9)(i/i6et

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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 hivvsxr(kd0 d)-z4 a7that 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 cosob; a9x5f 4 bsoo1 yd443oozgil produces what kind of change on theo4zo ooxfa9go3b5sd41s; 4b y induced $emf$, 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 magu9k ,2a*op7 uyuagm7l netic field through a loop of wire produces what kind 2o pg9y7 ,lauku*mu7a of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on el;lsk15c9av the induce5l1 lk9av ;escd $emf$, 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 field a2pgv wos 1i-b7o r;w-m5antn+-j/ vjgn $emf$ 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 an(bu6rq ras ua2o6k+; conductor will be that which tends to produce which of the following effecr+;o(2a 6n6 rukbqsuats?

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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 hor v0qxs vb/tkhuu6/)u* *gz1lsizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abks h ut1lv/z/*gus xqubv*)06ove)

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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 t,y nv*k0p x ng8:xe)gd-ufu (above its center with its north pole pointing down, and released. -xy e,xgtp8knu f:(g) un0v d* As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic 6*lc pr1olh5.5w as.f0 o guw++lak fkvfb98wfield 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 fieldo55f9p sbhllfwk++urlv6 f. 0wk*gac8wa 1.o 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 tablcn d2kf8ac-8je top 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 i 2c 8f8kj-ncadnduced 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 r 9o;kd1pjirt;wx 7s;z egion where the magnetic field points straight down. The magne tz k;o1w9pd7xj;si; rtic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on yvhdgun4v( k. l1 sc;q (gvvpvx8m,y/ h75b2oa horizontal table and carries an ever-increasing current northward. Tw4 2,;nq/buhkvcv gvx dylg(y( v1. 58 so7hmpvo 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 wd8jivp67sbecux.c 0lshv 0roe/ ,k55ith the north pole entering first. As the north vc0boh u5e 6xcj.kilspd5r/se 7 v,08pole 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 rotath *ux mcbr (jtb(,b*(oed at constant angular speed about an axis whose direction can be varied. In a region where a uniform mb*o(*rb h( bt(xum,jc agnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whosmj sl 9 mpb:n61kvyr3b6gg37pe direction can be varied. In a regisgmmy37 pv3k 96:rj16nbpg b lon 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.np -:sprm7n .7ijguz;wsgn: 2
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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 an o:m4prvx7 uw 8$emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. cgoqgnv+81*c.8e a y9 yo /yeolwk0 7u 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) iad(, z:z7feumnpbx uy((.;px s moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.apdxu7u,bp n e( z;.xmfyz((:

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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 xho 7zr* /z2t w;7ow;cz f,mwrf9tl7wvelocity $\omega$ 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 transformsfx t :1f5lv,hs

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequencmqvkvk*m 3 5 l6t7pz0hy of theqvtmk76pzv0l k*5 h3m $emf$ 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 used topy u) wgryo83)

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tcy5ksw37p0b vhat

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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 tha+vba4ih3, hmb7pfkk *n the primary coil then it i7pm k,f+biv4k*h bah3s 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 tzn i/u1 b1nx (ez8ytk* lnk(0vhan the secondary coil 1*iz 1xyn(vnb8z t/k(u0 kelnthen 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 powe4b*cvxi8r (or es34 nar 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 gh 6mezeb11 peo:2)y x2pa8 oycircuit,

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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 of consk-4t)bdhtr (l..zwnvb qxz+9/e kk1 atant terminal voltage. At the moment contact is m tba(vkdr1 n+e9khx zklbt-.4z)/. w qade 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 coc/5krnzog 3y *qe5+rpnnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batteryeon/kc+pz* gqy553rr , 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;3m 007dk (8 wlpf+/adfhoihwsk zl9k $emf$. 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 ypm -76 1ue4clfl+bsaa5 um c4inductance 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 connecte0c;lul)8 nkuj d in series to a battery. The time constant for the circuit representn; l8)0ukcjlus the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to xmv6v1ors z48+xqn;p/ag ih) a battery. The battery is sug r /xioa+vhxvnz p1q8 )m46;sddenly removed 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 same 0d pb;tq mgm;8k1i tf+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 A *j -y ezo zch8du2u-mz+:bbm7C power 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 cx2 c 2,rm w3nfd0oofc8onnected to an AC power supply. In this circuit, the curren0d 2 8orw mcf,fxn3oc2t

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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 tldx- dc4 wy9 njk,1nj(he frequencyc ,d-1n dkjjnx4 w9(ly is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across 2 tuev0h9 c *ck2lxh,r:f1numan inductor is doubled, the inductive r2c* :urx92 tfmue1,vchlh 0kneactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, thlkmy. y; :xruz2gc zi4ds+eka (7og78 e inductive r i;( zykkugg4z+8caxly.om 72d7rs: e eactance 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 d6; i t;e2xi:b n8lwyhAC power supply. In this circuit, the currentxd l86yet 2in;:h;i wb

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive react9s )r bvy8z+acance in an ac circuit changes by what factor when the frequency is tripled? +9s cbzyarv)8

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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 zcku+xj tug-sj*o872a capacitor approaches zero, the capacitive reactance of thajx+* 2so7 kg u8-jczutt 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 inductornyh8lsj2y, y3 and capacitor in a RLC series8 nl3yysj2,hy 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 defink+d5ik1n7u z ,8msa 0y :davmied 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 impedaej3 w z8(j2 ze s/aj(pc6+ipdcnce of the circuit increases if R increases. When is this statement trujpcpj8acz+dzi(/w j (26es3e e?

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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 circbx0/vwfpo 0m2uit 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 d2erlugsg*: 69vgk.:fscym/ jwt:1 fcircuit. 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 capacitl)q+w 2qsbo:e ance both double in an LRC series circuit, the resoelwb q:+qs 2o)nant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuim lgt ridtkx3 a-0;1f/t 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 ock 3dnm.:bme1 6p/cqkxcurs 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 radiur jn4qao +..xvs 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the rq4n.+ a.ovjxmagnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0szu4 :ya//.ydu( itd )*de lni.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 fieayz/*d4d.iu)i ns: /eydu( t lld 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 esjbl(y6mge8; ( oc;omagnetic field of 0.20 T. Find the magnetic flux through the loop wh(;meyljc8osg ;e( 6bo en 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 a v7hel ;dt+qtzc 4r7mj(sp,f6djustable 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 cv5c kfc:: bah0oil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square framem+x 9h8 qzkv*w 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 value of th9xw* zkq+ 8vmhe 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 tuy22(ep:bd ban 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 area 6.tm :9gc;pz/ /nsxcn vprt 5o$0.20 \; m^{2}$ 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 a0 spxl pypa7( s58k3m0lk7now location where the dwx07snksmpa k 0 87lo( 5yp3lpownward 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 rotwuyqun3 b9y:zj2e pq 0s0zw6 6ates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic funbj 6ye:2ysz0wqp 3 z9q06 uwield 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-sectiu++ .,qkzw1wpk. tzfponal 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 *l pwqa ,1by0wof 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 $emf$.

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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. Eac3r1sqaoq5z ogo2qi6;p-+q ud h loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the ax r-2qopq5 1gioq+a u6;qsd3 ozis 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 /- hxohb4cz/k0tl6akwayu7 /f5 yh,o of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construd3 os/dl43v uv, uno2uct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.o2ulvdov4 n/, ud3u s3050 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 gwb9 lm4iq ;ptbzgl8q*v4z4 i5 enerator 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 havej8bx(c jbe7jf1 k88jlu 0 g ,ii/f4gpz a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W.+tyn;uo 8kb o- The motor operates on 120 V AC, and who8+u-;tyb kn oen running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V vmep6 4b+lhg.xr9 sy9 power supply. The operating current is 1.0 A. What is ths6y +x e.g bl9hvr9m4pe 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 intern rm;q pfje-1ftz-3ug,al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0-pmz f3eu fgj,q;t1-r 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 k-m ctwe,;8y o6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What it8 owk; my-e,cs 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:z2uzy/su we+4zrpm9l) jlp5e 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 twme:mc8qoqi 2 qsh725ransformer causes 14 A to flow in the secondary. Ho8i: 2om2eqmq7 h w5scqw many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primk7ie; e:0et 4 8 .u2obzqkxutoary if the 24-V secondary has 100 kbzk47x8toe ;e0ti .q2 o:ueu 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 p bl6tsj8)j v+brimary coil and a 2000-turn secondary coil. If tvjtl6+b)js 8b he current 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 a transformer. Assumnv38x 7ua/d ojing 100% efficiency, how many amp3xo7v /d jan8us at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10h f-uxza)s tz863eyrf a2 )h9m.0 mA. The primary coil operates on 120 V. What does thfzu)f8rye)9 a-x ats h23mh6ze 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 tur-(+/rqyyo0 fvl qd* ; /ezwcakns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is app;qw (r0cezlf/v-yda*k oy/+ qlied 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-qofqc(j pcxo/*y* +b primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the seco*c(o qj*-pyx/oq+f c bndary?

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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 100eh-7shvt 03p ,3tjw bk turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curre3 -vktb7 hw3 etsp0j,hnt 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 transfor *uuhcxnj:v8h-kt.3wrg o*9zmer has 100 turns and its secondary has 200 turns. If the ik-cv j3 g8.:u our9*t*zxwnhh nput voltage to the primary is 100 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 and its secondary has 200 tur 1 ghasyvqi2bp i*tge9xqe+f3t ..b-:ns. If the power input to the primary is 100 W, we can expect the power outpx:.taht bf 3e-*q 2v1bg +isq.py9eigut 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 i22hbq;6ljhe vq8j2v xs usually stepped up to 4500 V by a transformer and transmitted through a power line of x hleq jvqh22b6j28v; 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 of9h+gii5 xup7dsg w7+s current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and tran7wd h9pi + gx7+g5ssuismitted 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 usually stepped3; mdc, c s7xiwzo7,ox up to 4500 V by a t7 cox,;zwdism x,3 7ocransformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lon,v0lq. jjf bs(wu6kfw2p)bf : g 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 ratib,ksbqw(jf.6 l)0u2p:j f vfw o of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resist2hwr1 r.wnv; (ogi8x,owb j4zance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissri;rv 1(ww.b 84,zh2 xjowngoion line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V.sdc zg+:)s cn6 How much less power would be lost if the power were transmitt )snz +c:d6cgsed 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 60mf;u2w0 7edgduk n7 8ztgztat 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generat 07 72 8egu;fwtg uzkmzt6ddn0or output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energyfual6oj 14uc b pwg4/, is stored in the coilpobfuw4,g1a4/j c6 lu 's 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 6.0-W resistor and an 18-H in// xyp8v b mvl*)4wjfqductor. What is this circuixlb *f)w/8jmvp4 yq v/t'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 i l4a2*hz0lbvx fz3kcm ;mbt dzr(7t0 8n an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outletc5r2de7i v 9bt. 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 placej+/e/e *2y (ppqtitkk d into a 120-V AC outlet. What is the resistance of the lamp*+ k qjttk(/e pei/2yp?

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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 they .ndq+n jv y(80uco adgs9d90 peak current through the resisto9ydjn+qa(. 08u0 g dyvd9scn or?

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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 + bfo 7izd8r(civ+b k0euju.1dissipated in the rd8u1 cifi.+oz7+e (j0 bvru bkesistor?

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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 rfb2 ;c 4 wx:q +o69ro19*ve zdojitpkwesistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is hpvxp+35zhy+/11ge xtl6p sy $I = 0.80 \sin (240 t)$. 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-Wh34rb e3j 8f6v pbkk8m8gs9m y;ere,e resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a pj7l hm usmn.k: s d:h3;hg2.sux 0eq31.0-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 reactancerxo 1drl1(dj31xa w)z 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 14.0s1*k lq bl;xq( 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 vjj66 fh7de9 ck:mz v3for 157 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 of 20 kHz ist0v6-h0 mxjiu ila zztx )b4.3 applied to it?0 z.-hatzxvj l)46t im 0ubxi3

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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 sour1i;r:z7 ae ftqce?

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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 e xj0vtbgf;yw,g ws1 7;2aon2of a 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 hzp f31c8ui6 epave 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 8n48g5 jxbo)1 gopyftcapacitor 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 c vk1d;/ovy.ehapacitive reactance of a 0.010-mF capacitor be 100 Woedh; /ky1.vv ?

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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 capac tpw 3lmdrr)5 hj3b)+qitor 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.h f4 8fd zh6m h4nbz:x*jhmx460 W resistance, 15.0 W inductive reactance, z*4 fmnhm4h46jf8 b:xh dzh6 xand 10.0 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, anm.o6q6p8 g7 y g7qeopfd 1.0-mF capacioq7ef6gmygpq6 87 p.otor 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 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF i4dydac .e*j. capacitor c .d*i .4ydaejare connected 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 con *kyj*naiv(z+nected in series with a 20-mH inductor, what is the impedance at 100*ynia zk*j( +v0 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 wi3yuo. bl, 3pqith a 20-mH inductor, what is the phase angle at 100iqb. ,ylpo33 u0 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 2 o 3 ;tsm 5opyto:/wjjbz3g6 8zcqi4c:0-mH coil and 1.0-mF capacitor for a total imped sb mo5z/ jtc:izo8to :qp34y jw36gc;ance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed,t9 jyuk a1zgj*o*b3i in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 21gajy,b z* io *9uj3kt000 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 bv5jmj9o )m dl g080 t1rfbsa+be put in series with a 450-mH inductor at 5000 Hz for a total imo jj 5 bb9ms+t081avgd0fm)lrpedance 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 tbjz+s uedi.;e ue 9/d8otal impedance of dsu.eud8; 9zee/j+bi 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What m dv(+1q n 0duw98ixvvis the impedawmid d0xvqv+1nu(9v 8 nce 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-ye iv+8kq8dit0rkm;8mF capacitor at 1.0 kHz for a total k i088ie8m;+ y qkdtrvimpedance 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 needed in:m1gjbp jv w*0i.zik 4 series with a 10-mF capacitor at 1.0 kHz for a phase angle ojm4w0zj*. gkipbi v: 1f $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is q;jr btz,,jds/* grgp(g6j/eneeded in series with a 30-W resistor at 1.0 kHz for a total impedan zj gp(ge; s*rbd6 j,//gqjt,rce 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 100-mF capa81mif+q 1 g5bppiguy-k 8-mefz-; e zecitor at 120 Hz. What is the phase an ymf --18egqibempz+ 5k-ui8p 1;gefzgle?

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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 coiln0q-ai.ifhwkg. +z ,m, and 1.0-mF capacitor are connected in se.h .-akq+0ng f wimiz,ries?

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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 capac0jaf ac.l h4o)itor, and a 0.350-H in haj4)o0.cfla ductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capac8xi/ l,5flib zitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circui lz/,fbil58xi t?

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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 contai r*oea1-.if/pay 9r+ qmy9epbef i9 r50il1 bsning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wheiq* 9a.p9s 9r0b ber+alf p er o/e5yf1im1iy-n connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-j+g 1xu 2-e: x a2a9:wt)ipbn67jykujaz vvq4W resistor for a phase angle ofx4 wyxt1av 2 i96pzu2vq+a nbk7ej): :jjgu-a $40^{\circ}$ 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,lvw0d0nf iutz8*)u/caxi 3+v L = 200-mH, C = 10.0 mF. At what frequency should t0/v* acnidz3w x0il t+8vuf u)he circuit be driven in order to have maximum power 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 resistancj3 m+vgmywon(f ql/80i ,l. 7gsqfxq( e, 15.0 W inductive reactance, and 10.0 W capacitivvqy7 0n 8(,sffoj( .i+m/mwlg3 qxgl qe reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an (k 1.t,rbv wol2clu)d AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistanb/ejtbbm..i7 ce of 30 W. What is tit./ bebm7bj. he 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 s,jf .gt,mw8 lyeries RLC circuit containing a 50-W resistor, a 10-mF capacitor,,gm8f j.,tl yw and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seriqn8cv9djq3.(d6q gq bes?.qqn9db(gq3 6 q j8vdc

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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-mF ca aq+ .(ovnovt0pacitor for a resonant frequvoqna otv+0 (.ency 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 induo2gj4+ re*giictor for a resonant frequency ofjo4* 2 +riegig 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 serie vbtx)32hh.oes with a 30-W resistor and a 40-mH coil if the resonant freq )3.hxheovb t2uency of the circuit is to be 1000 Hz?

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