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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 excep -3za0*w hedgut

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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 inductioorh oqb :gcsb() r:)xfc-j82 vn states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind o- a1b ezb4qc7of change on the induced qc7b- zo4e1ab$emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire producesrndm vku3 b/5o7v/-t9q hjq/ f what kind of change on the induced 9qj/ qv5thovm/ u- k3brd7n /f$emf$, 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 loohmz ) v*b7tpebrt6 de(z)x/z *n,mxs :p of wire produces what kind of change on the induce(x msbebm:th/n, p)z* v 7 xret)z*6zdd $emf$, 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 magnesfq 0tc2a3nmkjh5)t7 z2n0n uf n78k ttic 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 lape.tias(n eboq4fmi70b7vo4:lz l 6+ w, the direction of an induced current in a conductor will be7l4 mt iol7(s 4q ieo+6 0:zvebpbfan. that which 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 horizonta)e8;yksvnbi0-yvm +v l table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (whe ;y)iks 0ve8mb+ny-vvn 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 tablent irzumn k .o26qw om.ji. cov(4zrv/ 2v8/y/. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed v rki4 vr.8.zn2/o(. oqm6/ci/2nj ywvtoumz 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 fielet t37wn8*i ndqf1 oz3+ hkp(rd vector points straight up. The magnetic field vanishes suddenl3 ( ne18k r7d+*tq zfihpt3owny. 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 top in a region where the magn,pcz wug k77)-oudzz9c2lwg 8 etic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from abovl)w,9zu7dcogz -g7w u8zpkc 2e, 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 where theww ;orcu6a 9n45i1 -mvz5cboa magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, wr ww6 55o1vab9n zcam;c iu4-ohat 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 lie+ ba z*f7iaxo3cd tv..s 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 above, tc.3o tfbvai d.x7az *+he 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 tm8q*3 ptenbd4*rmj 8 ghrough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current wil8d3nm ept*48qbr*gj m l 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 angulartb6ip bz d /7:,,wgmqg speed about an axis whose direction can be varied. In a region where a uniform magnetic field points:,wgz qti,g/pm6d7 bb 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 constd6ww1 otinsmh+6gl9 /ant angular speed about an axis whose directio gh1n9+/ tmlw ios66wdn 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 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.e zfd a) *b7e;z5d8rxn.enko6
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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 anp j6qq is1yurq/3:; bc $emf$ 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 fielbtq )nmerrv z. a.d4+p,ljo84 * ad6asd. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved nm4p j6u (bktwdla6+q4orthward at constant velocity through a magneticwkmdajub6 +(q644pt l 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 rotates at a constant angular velocik9c +m7i.xzwd ty $\omega$ 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 generato4 1 4c)a xzfu3e1j9u um4fjxpfadv+ k8r 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 each secmc+s. *w ra2qfn47m8vj4u d eyond. The frequency of the7am q*fd2jcews m rn4vu.+48y $emf$ 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 dr2 klk3b7b-e zevice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thatz ji9j1s jb z3s3a4fn6

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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 mojznlxp ghs4 ft 95j;29js:hrwwo ())x re loops than the primary coil thexhh)2;gs x w49spo)zfrwt5jj (lj:9n n it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary c q0 z sik)+(dxagfweejm7 uh260 .tzk5oil then it is s0fz ( 7q eu6w)jte.mgh i2+xa0kkz5da

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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 pg:q6g*j3g3rkpnq+ 6xcrx j v( ower 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 circuit,uk5n)l+pq9gq

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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 i3i50w0aj sw6 pca5azu deal battery of constant terminal voltage. At the moment contaci0c 35j5apa awzws0u6t 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 ako)d;3kduqlc0 01us pn ideal battery of constant terminal voltdq du 03p1;uolsckk 0)age. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistancyp8rjfl(rc mo2q3a /3 e R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectedgjo*pq nf3ey-i g( eq ;15zz8k 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 bq+k/ azhs8 8c-qpist3 attery. The time constant for the circuit re pi s+hatzk/qs 8q38-cpresents 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 connectv,:+k 8lcklvr ed in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents tlvk+lvrc8,: k he 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:r6o++o m xwit:meo2 l gs:p7i the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power sup oj(hx)mti-x)kpzu 8yh .z;m g95d ff9ply. 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 Aw p:xpn. 1ags5C power supply. In this circuit, the currenxpngs:.a51w pt

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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 ci:bv8qjcv g tj5 9er3a2rcuit changes by what factor when the frequency is tri2gtqej r8v95bja 3cv:pled?

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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 acriuz3 3:7mfvuhoss an inductor is doubled, the inductive reactance of that induu3 m7:hzf uv3ictor

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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,vxb i(2w+ 16 k.la.rfmzb4yvt the inductive reactance of thatv 2wlb6b.zkta m+ r1(y ifxv4. coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In thisn e4xw-6+x 5l mna /2gwkbmrw5 circuit, the curren52e+nwk 5-wxm g x4awnb6m/ rlt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the frevskd)7eu 0b )squency e s0))ds vuk7bis 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 a ,)wmex+t.i, ixe-,-n a8i rzurk, exicapacitor approaches zero, the capacitive reactance of thaue.)t-zixwx-ei n,a,8ek+ri r ,i,xm t 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 inductori)a fc1gw96bcv4;w a9z -fnrc and capacitor in a RLC series ; -rf bvczwn 9icag1c)6a4wf9circuit?

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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 RLChl vg5m.wp5y2- * ky cqje4m*y 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 9 486kucidvhph f6oh+impedance of the circuit increases if R increases. Whh kcdf84io 96p6uv+hhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the./kjf nr0ad*25 ivvt oe,m7tr 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 seri9-wr;l lu m)7.nzhh5)rl m/eme7q i n 0zfw.yoes circuit. 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 theae1d2, 1ry lfu capacitance both double in an LRC series circuit, the resonant frequency ful2e dya,r11 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 circuit that is driven by an AC applied +s2/f7rgm20ghgtv u i 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 seriez,mcur nme5+3xfne fgr,1 7x:s RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiusr o/oq;o-hui-u8em :b 0.10 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 magnetiou/m8:- oeboru-i h;qc field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is roti,o:boo:.vg v1ag4 ca53 a7aynp h,w wating in a uniform magnetic field of 0.20 T. Find the magnetic flux through theown:pvhv 3 oyaia,b4o: .5a,gw 1ac7 g loop when the plane 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 magnetic fie uv2s0*qj at;s2l fw7eld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mat;aq0v22fe 7s wjl* sugnetic 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 adjustable single loop i- *zk1wapfm wh2ht*.as reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fro- 2pna )jlcw2bat.w;vx:*pw cm $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. Asdqr,*vh9 u*d) eq7qn uniform magnetic field is applied perpendicusdv*rqq*)ue n,q d79hlar 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 15 turns atm 8h xa ps15ylv/0k)end 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 ahlw9p0: v ve4and 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 spd;u r6l4 e:vopan of 60 m flies horizontally at a location where the downward compu r vl4e;:d6poonent 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 isdv dqtcbn( 07vamh38r -hv,o1 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis 0dvnc-h qob v17ma,d 8tvh(3rthrough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-seck*0)ms(df.1beps erh tional 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 as7 :+9do1nv g+yyskhnx 0f-k irea $0.090 \; m^{2}$ 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 armaturetsfj3 8ek,,m l. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a un e 3,kfjslmt,8iform 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 of 100 turni.+nn-z: wn2/ yy*rj)uhoj t -4oicu(dsm 6xus 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 generp1 dvo7b+u3 eqator with an output of 12 V mapb7evo3 q+1ud ximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a tj:)u-hd 4 xwjp4c *ahmaximum $emf$ 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 opera)4p /t2 yxos( x0danlltes on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on3h3kh8xi0 ta oapt7h6 120 V AC, and when running at ful8aahi6h ohx7tptk 0 33l 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 connecwmut8rfoavc* 0mg5z dr0 +, x+ted to a 24-V power supply. The operating current is 1.0 A. What is the start-uctmrra, *8 z5xow0 0fd+uvgm+p current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. 9a7l)jq o f gg +h3nl/an872ruy *ifyf The operating current is 1.0 Af/)qf3f orga277 8n*nhlyj+ gula9iy 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 toas,tj g;x3o;a a 24-V power supply. The operating current is 1.0 A at full speed. Wg,; a;a stj3oxhat 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 transformerf6p6e k/xfz9 j is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in ( t :z g9(ytm9 u8vb;l8bisbdxthe secondary. How many turns are inb (uvgis9 8 :m9tyldxb;(8tzb 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+ rcd a culln97/:/nxp primary if the 24-V seconpld 9ncr cl/ n/u+7a:xdary 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 primary coil and a 2000-turn secondary conbz yibw8+ 4( b 20q(b2vytnfxil. If the current in the secondary n y2vy2f(0bb4qbtznwx( +8 biis 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficieulzoy u8x3z ;1xon (2gncy, how many amps at 24 V can flow in the sel3 8oozy;x1uz2nx u g(condary?

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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 trans;yo+-i9fbw +lq3 vjqdformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drjvqdlw; -+qb y9+ of3iaw?

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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 anp b, x(:ues42h7ijwxc5sf( e zd 300 turns on its secondary coil. If 120 V at 2.0 A is applie(:iepf 24c 7(s,5 xhbzsuxj wed 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 has2k sp/vx0ty8xl q4v6z 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whxlt2z8 vs /yx6 pv40kqat 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 turns and its l 61 4gy )o3aygqp y.exw2sw,isecondary has 200 turns. If the input current at the primary is 100 3ype,14 ywiq6.o)gwsxy2 galA, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transfbd)eh;9nur a f3p4+z 9yyx5foormer has 100 turns and its secondary has 200 turns. If the input volt fe)9opbzx n3ruh4 9+ ay;d5fyage 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 transfoq.qgazpoov u(0:cjk 1w0h)v-rmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)1g.vjh -c0qap ( zqo wku)v0o:

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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 vols pla v+j i+ ynzf8m-t 3u)pa4b6)p4mxtage is usually stepped up to 4500 V by a transformer and transmitted through +m )smyxz4la ppi8nb3-)+tu 6p4vjfaa power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped umvo*6 js1e8ymp to 4500 V by a transformer and transmitted through a power line m1ey6m ojv*s8of 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 us8270xvefu 8hsde(f *rvue x0hually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage s8v(7xrx *euh80vdehu20ff e power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60+6fcl u1x5tu/pn d 2-7pqm edv 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 steppedtf d-me6p d vxl1nc7u p+25/qu up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W.4nwol l*m0e8, yzup.n A generator produces 100 V at 70 A. In order to reduce e pm8lu0,eol.wnn z4*y nergy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much p/ejl7+(sn sus/k4 m jvfs(fwo 07nk.less power would be lost if the power were transmitted at 30 74(unlk7s/js0f+ jskve.ofp/wm(ns00 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 i/wcgk*6se+ (g6to cujo m;q z9s 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not oe+zw kcq6 6ctj o;m*g/u9(gsto 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 carriei3)d)x crwdc5s a current of 5.0 A. How much energy is stored in the coil's magnetic frc)dcwdi5 )3x ield?

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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 e 77z3iold m:r-8m)zp)pa jokresistor and an 18-H inductor. What is this circuit's time colzdpm8 jarzim 7o))3 :oe- k7pnstant?

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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 where the rms voltage is (0 :wbq kc qp+/j*vnjj**ji nd120 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 i whbg j;grk+-)nto a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Wht zotfa0 ,;wpy;p- o2pat is the resistance of the la,; 2yw ta;pt ooppf0z-mp?

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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 9v 6w (s+1tc (gliveut az5s7tsupply. What is the peak current througwtszs6i c (etta7u(+1 95v lvgh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is conn9a / 3/dto1crdn5pdup+um0w 3xw( dhiected to a 120-V ac power supply. What is the power dissipated icd3 p5i0t/hau x/o 3nurw(d+ p19wdmdn 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 resf iy, +g po0n.7kulvaf4o1i8 qistor 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 2o8x*:arqxm pgmh5 erjlg-8-resistor 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 res oxc0)fju8l1nb r 5lak:4t pd(istor 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 ofwa s-+e*z(xs ,muhoe ,,tux o3 a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 7eo9kh c+t2 du2.50-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-k u1 z1gjs:, n(ehs;qnmH 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 157 W of inductive reactam, zq ou9yx hy*ys8*.g*k oz4knce 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 wwawhn yx ,6d+9hen 120 V AC at a frequency of 20 kHz is apwh9xnad6+y w, plied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due bkwvuf5 :.a9i:b7d09ql8 bttah)bdyto a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of;u,kd8 b ii3u*+9bd0cnzxjl n 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 have 50 W of capacitive rcsbb avl;4u 7a//a 9mxeactance 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 a reactanced *7wj70bgytpa, se rnto.10s 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 reacta/ t1,o :jig 3zamy288xuuvxopnce of a 0.010-mF capacitor be 100 W?mu:z 3/ 8tvyj,xxg 2o uoi18ap

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz dzr1 h4;5t qjyah0cfm94206bl oxzjxand 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 inkrty60ld lni4 29z h00mxudp 7ductive reactance, and 10.0 W capacitive reactanctpx900zl li 42m76nurhk0ydd e?

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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 1dmajhwm )v/.kf hb;s;2 vs23x 500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cb3;vk jsh h/msx;)w .d2mvf2 aonnected 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 h3lin gd /+d;p*rsoo+i7x uw01.0-mF capacitor areoi;*+o0wx g /7l idnsrhpdu +3 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 onx/p (m,mpl4adbtya,*j,i)connected in series with a 20-mH inductor, what is the ima/ x) td4oy,*a ijn mm,(pl,bppedance 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, wh+(uy1mc 7tq j5dfj8 rla 5,r ufb-e6q3,htldvat is the phase angle at 1000 Hz?u,y(5 vqlduadb-lrqj +7 jh, 5mf1r863f tet c

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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 cn 0 1;g7nkh wl5u ,ic:vnfso:xapacitor lwn ukgxn;:1 s,c :ioh75vn0f for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is neededl0nqw1s9h h f /wd.hi k7*kqn8 in series with a 100-W resistor andhw1d9h wkn*qhs/ l7qk .f8n i0 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at u qcku+ilo*:27z (ab o5000 Hz for a total impedance q c *kb7ou+u(lo2:zai 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 am( lfku(c ,ue-9;lud series with a 100-kW resistor at 1.0-MHz for a total impedance of (-k f (u;9luue,ld acm150 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 connectludlkal8 , u87jtqw49ed in series with a 20-mF capacitor. What is the impedance a4dkjlu8u wql, 78l9tat 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- xfm h7iuueu40fm6- x7mF capacitor at 1.0 kHz for a tota fmx im6hfuu0-xu7 74el impedance 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 series with ai-n i,1 vivez( 7w2rqj 10-mF capacitor at 1.0 kHz for a phase angle qi-i2 vj(, e rzwv1ni7of $40^{\circ}$?

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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 seree.ap+ /szv/ sies with a 30-W resistor at 1.0 kHz for a total impedance of 45/zspa.v /e +se 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 se5l ukl 53vug 7o*5n/r-s72piga5nm uvcxo9 z jries with a 100-mF capacitor at 120 Hz. What is the phama*7luol -p5iu5o 3z n5 vj 9s7x2uk vc/nggr5se 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 coilu60qrt f 7kmoip: f+biyh9fdhd4.; .xn , 0vva, and 1.0-mF capacitor are c nt.0pv:9 vri ffh+;0f do7.akubiq ym x46d,honnected 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 consists d wawj1x1) -feof 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. What is the rmsaew-1fdj w1x) 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 Wfx*oys 78kj)ht9n:l2 rueesz jg )buef 1 5g5(, a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are conn5to*ef s9y zl u7hg2bejj 18f:5n srek)g()xuected in series to a 110-V, 60-Hz power source. What 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 ser 07nwe2k pa30l6uiev .hfdey+ies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 607 eeuyf w2e3kd+vlh .6 00niap-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W wj7,ogihkri + cam2 7kj 2fr4o6i,-vks)b,llresistor for a phase angle o7so i7l+c2,) iwvfkglj-4mrhj a,6or b 2k,ikf $40^{\circ}$ 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 =sobx-92a y,y xkgo*x-0lo+ovpv s) c8 10.0 mF. At what frequency should tlx9k,+ -oxsopgsb o-vy2 c0v8y)ox a*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 resistak35tic-1hb b 7z7thl*d-d rlwnce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when th 7tkr*5ib31lwd -c7 zdt- bhlhe circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is-rflkjjx 6dlx7b 1-uq6r ,v3z $63^{\circ}$. 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 resistanqkjeb.g6b .w-ce of 30 W. What is the power -qb e6g .wjkb.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 foun1 7diyhsoa3x + vm1*r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45- 7+yi*3vxsd n1ahm1u oH 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 ca pq;u jko*r s8o)6im)upacitor and a 15-mH coil in series?;6s*muopjok )ir u)q 8

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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 capacitor for a resonant 6;vry y +ouw 55yhu 0nwxtwc;,frequeory; t+55;xu y,ww wn6uhc0y vncy 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 (t:/ke gtn03a/1 zuwkioyo *dneeded in series with a 3.7-mH inductor for a resonant frequuw gyo :edk zt(*k3a t/n1oi/0ency 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 za7nc 64z+qdebe placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 100nqa+7cd z e64z0 Hz?

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