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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 01f1sk 1pft 1x )ehjhzflux 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 th+y, u dp,oyja9at 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 rt w *q(h2xp. /5t.gcbm+up. lk*wvu jkind of change on the ind* +(t.gpbp*5lkuvxu .rwm qtwjhc. /2uced $emf$, 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 looba1 rnv n:a9*ip of wire produces what kind of change on the indu : *ia1varbn9nced $emf$, 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 1( n dh4 tho8t-( /(hr+3;rweg pwrqm6sbcqti of wire produces what kind of change on the induc whr/ dcis-ht( q3w4t(6 (qhbope r8r+ng1;mted $emf$, 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 :ldpzv20(c w m-ygt-/ zhk7ctan $emf$ 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, + i fq j;u.q7yqhmeb15uv;i8 vthe direction of an induced current in a conductor will be that which tends to produce whvyq eu ji5mb1vqu; 7;8qi+f.h ich 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 iujw8b g-:kd3p ts center with its north pole pointing down. The sbp-dgw 3kju8 :tationary 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 magnmn k/y:m*gdy(et is held above its center with it/g m(*dnky y:ms 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 table top in a region where the magnetic field vector 5jm 5gbvr91 hwpoints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in thvrm 55h1gbj9 wis 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 jhq 6fsp5ms,h,t)w j7 a region where the magnetic field vector points st,65fhqp js s) tm,jh7wraight up. The 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 in1 mu efhe4) lmu 0fp.70yksgs8 a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what08emsysf l pg)ukf eu7h0m14. 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 a horizontal table and carries an ever-increas0r5f;2pt,0oqmivvc t o8q7w - jn5hkding currenp0t t5,2vmqk;8h7 -0 vdwnojr cof5qi t 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 entei*vk c8 w2ye9dring first. As the north pole enters the wire, the induced current will be (as viewed from above)v2e ywic*89dk

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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 constanng p1m1pg)d8k:8 q0a z bsg0rct angular speed about an axis whose direction can be varied. In a region w)rc gsba8p1m0g18 d:0gqnz pkhere a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wirn8c.el.2k xv2di euh9eiy g29x fus6+e is rotated at constant angular speed about an axis whose direction can be varied. In a region where a unifo vy ileixe.d n+ 29x9 kehg22fucu68s.rm 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. m f+))5xagli7(:r)w h aygasc
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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 thatw7t2tkd1tmdkh/ 3 e4i an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fcloi-n +4uur6 ield. 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 thekf4o.dpagi*+y lq/v7k.. ,w) a zop ro east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induceagzvo d,* 7ofl.k.oa)qwi p+ k/ ry.4pd 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 const. -lz7xwn:3;xt-u( zlbc z-x xwaw g-nant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfor9(z0qa ) frhf:qvck3 yms

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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 frequency of(;ql(y5fyy x cfzk:4d0un0 ii theidy4fx 0izf:(q( yl5u0kcn; y $emf$ 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 devi2tw +d sxvmv3zc5rh 71ce 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 pl1 r)i 3ubgpc,hotdp/qf)y8r3 b86h 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 m0*d rlzlr+(ychb31k;srvq ;jc cg+q 8 ore loops than the primary coil then jv +glqckc( lq1r +r0cyhsdb*83;;z rit 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 ,ur9m)ix-o4x*nl n/ov / pgq9g cvd m0coil contains more loops than the secondary coil thenp n49mg*l, v)0-d/9oqcigxu rxmov /n it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power .0d,qkvc x1uqscw2u2 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 resonan9tshwv +n 8kq k/l nzg2gq7):jt 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 * fcx8rph-hzl.g-bv1to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thbx1 .-r8 hcg*lpv z-hfe voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batt eynbb31t1+ +gm4n4bb *robo 6o viuo*ery of constant terminal voltage. At the moment contv 1oig m1u b+*e+o4nb34*ro6b bonyb tact 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 k( rg;kdx a8p:with inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductanc* wwsd::t * jrzjd-0vye L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seri + 70htipivsvft 5m/g7es to a battery. The time constant for the circuit represents the time required for the current t0+vmhfitt/s7g 7i5pv o reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batteasn vs8tm -b1f e ;tklgh8k,u,--ypf5ry is suddenly removed from the circuit. The time constant for of the circuit represents the time requisf 1kng8t -,58ump ,s hylefv;-btk -ared 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 thaf43 o2ca 4u c8v pffgte/z4.ue 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 connectdj msb c4p;0b6ed to an AC 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 connected to an AC power supply. In this cify5-xpfk5t8k r. fqk en:m*y*rcuit, the currenkxfk-mkf:qpefy *.8 nt* 5r5yt

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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 t2apw (*y sq* f5rh7irrhe frequenr2**fyi 5s(r7waqp hrcy 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 an inductor is dougp2 r)ej m 2ho;y /2ogs/h yh1g4dl)rkbled, the inductive redr)21h2gejpyho/4y ;hg k )2lmsrgo/ actance 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 approa5 -tp4lydk(rw.oia4 v ches zero, the inductive reactawti4v .-d (l4paorky 5nce 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 connecyred+ a* 39d hbmki7:hn,xjb 7ted to an AC power supply. In this circuit, the currenher *kjxd,y 3nmi7b 79+d:hbat

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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 anbjb8b4rz9d yio6ac2: z3f-bx ac circuit changes by what factor when the frequency is43y9b 8ajbdbibz 6 fz:x2o-cr 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 caple51b xf+2j 5/tygvz nacitor approaches zero, the capacitive reazg 1v/5t xe2b5 fl+jynctance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductow. k1fz 9rv.bkr and capacitor in a 9 vkwfb. 1rk.zRLC series 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 ighg/7 i;nk50fvg3p6l :x i mybs defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increasebg;nee5r .ul3sux 09 es. When is this statement true? xngeu ;0r.ue 359sble

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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 imsx h)7eod58r*a(r uy)gpay w8pedance 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 in6 po mod*p9au9zcw23 4q:vwfncreases 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 capacitkzrl*g /p hic3 5e.y8qance both double in an LRC series circuit, the resonant frequency ckey /5*lqri.3h8zgpof 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 voltage. At resonancab+he-n4-og2uce*j7*c,+ff le fvw ye,

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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 ce4+ tf*.kxea k+, x.lacqn s)wircuit 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 radiusal*clmip1us ;9w7i r2 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magne;7 im9slc il1r2ap uw*tic 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 0.10 m is rotating in a uniform magnetic field of 0.20vpl/t3 .qffd8ewzw n5)v,3v f T. Find the.fvvlt z,p dn5wqvff33)w /8e magnetic flux through the 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 unnzztf, +huy7d6 0geo:iform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of 0t uz6o fd hn:7e,+gyz$30^{\circ}$.

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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 isn;arl+ .uhg,ew.e7 ky 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 8wbkux- rxs 9v8iw8;k 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 20ugyw* 37ew52yhdpfn:i: y; g c0 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the avy: hg:ef gyw2p7c35 iwu*d;ynerage 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 and anht(cusqgfy /+/ 65 wzy 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 ;./hkzkyv (w gz(z 4hearea $0.20 \; m^{2}$ 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 7+a,frrhta s -qi2 ib:m flies horizontally at a location where the downward component of the Earth's mab,h7f-+iiqrr s a t2:agnetic 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 t-,oan2tu ;tgf;su.c rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in ;s,ucatt2t;-u .fnog 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 an v*v21hltkze, d 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 100i -*c6 oejp1pmbugy5ab5i6pr7jx(r ; 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 rectap2)r ;x2he 9o5tl6 mlv sqzly9ngular loops on its armature. 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 uniform magnetic field oeto92zv6lqr2l h ml ;5)spy9xf 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 turns of wire of oj gilo t-4l3;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 geneesh--v 7 en1/ ,ykgjkyrator with an output of 12 V m/ g7,kknsejy1-eh- vyaximum 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 gene+tuc ldemf *569rhbs0rator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The cv 3*-tlvv p)9edm y2fmotor 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 a7,mt jjad.f t ta+ //p4opg6ad resistance of 6.00 W. The motor operates on 120 V AC, and when running4da/t/oj 6gj7tt, dfp. aamp+ 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 resistancim d)izem6 97xuy ;jl6y,amb ubw6* b-e 6.0 W is connected to a 24-V power supply. The operating currentmm 6eib;ylawby x6z*d,umj-biu) 796 is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 Wih6v)c(e4zkp9t4 dz r is connected to a 24-V power supply. The operating current is 1.0 A at full spe(6c4r)4pe 9vdzti khzed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppq+yz2kqy wtt lx:zw; +s,6; umdza; k+ly. The operating current is 1.ql k,;dy++2 zxa;m;wz tkqzs6 tu:+wy 0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to re1p og ukr+ j*b5*rmw/3a4pkhh )/gt leduce 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 can to1er7irgia9 gv6 ;+gt* t;6mk+reruses 14 A to flow in the secondary. How many turns are in the second9oe*;7 +rg1rv66t r tnik+a terg;gimary?

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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 9f5xy1gs 3aebz mw.f3 i4tm 0ea 110-V primary if the 24-V secondare4.m m13e53yf twif xs9zb0ga y 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-turo gr5aek:4r5g n primary coil and a 2000-turn secondary coil. If eo45g:arg5 rkthe 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. Assuming 100% er6btl, :c ds4hv,uy7e(7r yz efficiency, how many amps at 24 V can flow in the secondr:ceysd6 vzt 7,(lb4ry7he, uary?

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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 n, 4;u0gz xh5eg/kyc ygeon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. /eg5kgzug, yy 0h; 4xcWhat does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its qykpoz 180:cvprimary coil and 300 turns on its secondo18 pykzv0 :cqary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primar 9bc/4 8;nhglfs8wcq( hepwd(y 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 secondary?sfg/4d (c88c b;hpnw qle(w9 h

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has o 7niofmhi 78)200 turns. If the input current at the primary is 100 A, we can expect the output current at thn)hi o 7m87ofie 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 t3eo +p e-xl/aatv( pzt)-yy2 zurns and its secondary has 200 turns. If the input voltage to the yeaeoapzv -l2z (p t3/+x-)typrimary 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 sec a xgj, sq ..i9rl97oh4y7siccondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negle c77l49j i hgs.r xcoyq,ai9s.cting 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 a) e)ss ;zehn1ct 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resis)h;sseze 1c)ntance 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. Theh,gt6x as8vt)8 hz7 )o zd,tdz voltage is usually stepped up to 4500 V by a6),hstox d,7 atd ) g8tzvh8zz transformer and transmitted 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 cu4+(thln/7xgras 0gbx g:r -tv s da64srrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fi4 sstgg7dxn( s4l:+xr vbg6 a /0hrta-nd 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 long has a total resi- )v8s;dgf3kx/qz(mwqft7;ylu mt;uz z4 -c tstance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatiy;du sz7(ftwmtumk /gz-q3)vxq8; t -f z;c4lng 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 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 ke2 6f;7qze3da ngn( phas a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when thkq3;nef g nae6(2p7zd e 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 l5ce*aa otvt py 0xkr95/-4 cquess power would be lost if the power were trarcvax5y/9 a *u 54kpeo cqtt0-nsmitted 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 oyk+2 g6 d uc-5rea8rtwn 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 to exceed 0.010% of the or6 gt2wyu -rd r58ce+akiginal 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 j- qz;,vh4sdq a current of 5.0 A. How much energy is stored in the coil's magnetic j 4sqzh-vdq,; 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 contai0 ,a hr-hstsoc/xytf98l9b 0tns a 6.0-W resistor and an 18-H inductor. What is this circuit'0 lh8c9 tt/ys a,tbh-or0xf 9ss time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit6j7 l 9hlog(t ;y6e: /;(njrgunwkuvv 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 120a/qh 2je6o0ql:cl4 f n-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 ini: 7pmsw6x a9/nivk g8to a 120-V AC outlet. What is the resistance of the lampkpg6:i 7w am si/vnx89?

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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 aq53o(cb .wca3 9jyt rp 120-V ac power supply. What is the peak current through the resistory.3jb3wac p9oqct r5(?

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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 w8 tep6z1;5 uhr h1yxvpower supply. What is the power dissipated in the resistorx;y hv1wp6rhzut8 e1 5?

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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-*2ibn;dkkf6jxpa/p3s .me a5 W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50 odmf+k7 *iq-be)uhem2kps- * -W 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 resih4+3hzz; snjastor 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 inductorer3ejm*z9ong ,r6 oj jnt l:8(oi2 l.s 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 2.50-mH coil ax ldvgul-ll0a 4( ( gqme4bcdha6+.t ,no7*ho t 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 induct vx +z(s8ang,;udc ic:ive 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 ofkhj) 7x (fajp/( crl9d 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 aw -g) y3ey9kxlja ,(p; wcdvg0 frequency of 20 kHz is applied g-gyapvxek,ycd) 9w0;j (l3wto 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,)8 mrm+a 5jvtf z4/otv 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 :( ygtm*4xne +mqxvl l6ig.c3reactance of 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 n - usxjx3h7y1teeded 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 c.ndu pot,1,l19wv rccqohmx 01/l.y a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wilkzl *dyv(6 88apnq6 fll the capacitive reactance of a 0.010-mF capacitor be 100 W?v y a8nklz6d* l6fq8(p

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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 and 5.0z*r9fj g;5n ktetv 6.nh8ja+y 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 indps/0 x;sqf)wk uctive reactance, and 10.0 W capacitivpk;f)sw0x sq/e 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 coha 2p(9v)u,k/ea jf- hc-tyh mil, and 1.0-mF capacitor are connecte9f)jh/tk-,(m- y2ph ueavcahd 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* ,7pnen v8mj7cv1j hsp/;ed m-mF capacitor are con pm,dj n7 1;p7hmcn/sejevv*8nected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is thehc.u+ az ict2wzl*u74 impedance at 100c* i72 wut4ucaz+.l zh0 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 indpau6 :f r5nnk2uctor, what is the phase un5k : npf26arangle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit wi :z8i(l nxa.(fv0/+wctl(*ho o qztge th a 20-mH coil and 1.0-mF capacitor for a oz +:(.lielcqz*/vowg8f athntx(0 (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 needed in series with a 100-W resi9pcq0xk z0r2g2 c za+zstor and 15-mH coil to get a total 0pzz ccz9rxga2 2kq+0 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 450ihjt3/l.ir .u 7 hgea(-mH inductor at 5000 Hz for a total impedance ofle .t /7a.ijg3u (rihh 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 re3fbzm(6i w8t bmms1( osistor at 1.0-MHz for a total impedance of 15bf1m 8(tiw3bmm6( szo 0 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 sexlhak z w x779j4d8de ulhc;5 i-n.yc;s zad+,ries with a 20-mF capacitor. What is the impeda;has9y7 xx.cl7dhuw l-, 8enz 5+ 4kzd;ijdacnce 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 serieakywq)**q v5k s with a 10-mF capacitor at 1.0 kHz for a total im awqk*v) yk*q5pedance 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 a 10-mF cx2q awnn ld2-.efu.e3j /0ypd apacitor at 1.0 kHz for a phase angle aype. xluwq.d enn2/ dj 20-3fof $40^{\circ}$?

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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 af4pb uz (:dliwh1 kmy /fd9()v 30-W resistor at 1.0 kHz for a total imphmf(w f zu :v/4bpdy)dil1k 9(edance 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 capacitor at zhr(2p 3paf x 5whdj.2vbi 39 rzgy)n/120 Hz. What is the phase az)h5p if y3 /wgn2rr2x3h9dp.(zvabjngle?

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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 esvz lo55) :qo+vb6rkcoil, and 1.0-mF cakq o+v6seb)r:l 5voz5pacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W r odso;+rad k ho/(u,,lesistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit iu+ (,oasho, ;od/r klds 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, 24 a6gmcl;vs7ajaz1l a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance lj la1 mv7scz2g6 aa4;30 W are connected 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 series RLC circuit containing a 50-kj wv7c)o*oibc0i) / yW resistor, a 10-mF capacitor, and a 0.45-H in bi0kw7ciojv /oc*)y)ductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for aj6(pz a;k+ijstxo2i 8)nwm w: phase angle of amkon62wj :iwjs(t ;+8x) iz p$40^{\circ}$ 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 = 23(d 6d vwg* c9jbvid54q5o,s0hxbfrj0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tra4 (vw6 d5cix*, bfb5odg0s3rvjjhd 9qnsferred 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 cirrt( mxfmd)(0* j+ydqd cuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V pqmmfrjd0 *y()( x+td dower 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 xjpof+7(i)j j$63^{\circ}$. 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 anan-b;xxiq7bc ,-u-z)h v k7vl impedance of 60 W and a resistance of 30 W. What is the power fach7) z-,-blikax nbvcvuq x;-7 tor?

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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 containing a 50-W rest74mo)ip g:d(g a(obl istor, a 10-mF capaci(io:tp(db agg)o l m47tor, 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 frezz-ljm4xulm hjd . 31-quency of a 1.0-mF capacitor and a 15-mH coil in series?d jzmh.m l41-- z3lxju

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nee.(imu .ncnubm p7ye5 y0 3duw6ded in series with a 4.7-mF capacitor for a resonant frequency of 10 kHz?y6nu 5m7bmud. 0icuy w.pe3n(

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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 inductolsy8 0495on5yvpuuj5bfw;i*+uq y u hef p33lr for a resonant frequency of 1q39 8pufi 3 ln f0bu5uheo ; 4vyp5yju*ysl5+w000 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 series with a 30-W resistor y ;goak2jrv5e3k;j +zand a 40-mH coil if the resonant frequency of the circuit is t gvk2+ ey;5aok3 ;rzjjo be 1000 Hz?

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