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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 uni1ogrh*f/ba,w9agd 6+/ d wugcts of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induc* hk2ollh ol6yb+/mp,6qs us2o6kc3vtion 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 of chan+ dp-m7xnw i/wge on the inducedi-w7/ mw +xpdn $emf$, 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 produces0y-yha h i,dtwh,*/yx what kind of change ,i*,-yyhxhhwytda/0on 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 producvzi98o gae3.ces what kind of change on the inducedzg9e.8v cao i3 $emf$, 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 vr0w5t2d3-q opau4r man $emf$ 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 lawvtu kyln k5uvi).2v +:, the direction of an induced current in a conductor will be that which tends to produce which of+ykulvnu5k .viv :2t ) 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 abovef-ioq/ nwno(y v s -i1oz94)qa its center with its north pole pointing down. The stationary ma woafoz-1 49-(/q isnn oiq)vygnet 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.+bya(d9g bns magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewena+ gb s.y(db9d 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 velo.x.xv //nqm)p ; jqxctor points straight up. The magnetic field vanishes x ql//pomq.)jv. x;xn suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region wx4ljrb7-x9w)j v:g5m k7 xfjb here the magnetic field vector points straight up. The magnexm-: 5vgjj97kb4 ) 7xfwjrbx ltic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in ib 8 ex/b g(x)a9ao+sia region where the magnetic field /ba xx)giae8(sb9 oi+points straight down. The magnetic 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 a horizontal table and carries an ever-b -ltbs )h 6cc/4l.onpincreasing current northward. Two coils of wire lie flat h-)nol cslb6.tpb/c 4on 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 throud9 mkncq vss9ycx: *61osj9:l gh a loop of wire with the north pole entering first. As ts1csv:k*xd6:qomns9 j 99y l che north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whos71n6hln 90rmhuww 38 b ozdu+te directio30un+ 6t zh7dow1wl9 nu8brmh n can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whosg0. xjp/ i nj5w0-nojoe direction can be varied. In a region where a uniform magnoo -pxn5j.0w ijn/0jg etic 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.8ycw* cyv g49e1t3 rrp
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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 594 swz8fygbp 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 (1ram5lr 9 pj r-up)fha magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direct.,z/b8d) khp lhxglj3ion) is moved northward at consh .)8lgj xb/zk3l,pdhtant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates ersa(95rgot tu4 b )j+at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfx9m rhd,rf9lb 1w0an 3orms

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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 throuk0k o6fh-9ol vk)8 w4ryq/ vijgh 60 revolutions each second. The frequency of the /k-4)6 vj9wv0lko8 yr o ikfhq$emf$ 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 q* rv,e-ds3 miused 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 deviv2tv( nllj9a)ce 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 secon.ck-k1 i ehap)1rd sp0dary coil contains more loops than the primary coil then i-).kpc1drkae p 1h0is t 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 t.9n*jt2knjs- ppi- rbhe primary coil contains more loops than the secondary coil then ini n-jrsbt9. * p2kjp-t 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 pz)dticz.( q).e htg0 wower 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 jy8*ukg8 a b1qcircuit,

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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 yaam/dx0l q xd +.-,iwof constant terminal voltage. At the moment contact is made with the battery, the voltage across the r dw/dqmlixa,ay0+ x-.esistor 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 idea ljg3hztfnhe45 l 9a)nnc xv+ng;e5/6 l battery of constant termin+5nxnh hv5)/j4enllaet g96; gfn 3 czal voltage. 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 l ule c5b5rs2:(mza/,d dk bj fr)k9p6inductance 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 inductance L and resistance R is connected t5mlq2dn*:ozm4noi fe b8q n */o an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. 9pgv 9ipos3dgk3 6jq;0maz( d The time constant for the circuit represents the o 36dzk(pa90vsgid 3mq;g j9p 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 inductowjx185r4k vf ar are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents trxfaw581vj k4he 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 t( 98ajp,, myhjskkhn( he 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 to8v+e v3up h/qq 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 connect8k drfve;g1 1n0g6tz rry kay,2u j56led to an AC power supply. In this circuit, the currenyu5j2zy106;a1fe, r tgngld r8vkr 6 kt

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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 qurp.bs67i l1changes by what factor when the frequency is tripluips b7. r6q1led?

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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 ank 7jr har-e4 fg *35srl*,hwacross an inductor is doubled, the inductive reactance of that indulra7*wrg4 e- h r ,5fanjhks3*ctor

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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 voltpebth 4(2+hpfkh 0(lh age across an inductor approaches zero, the inducfe4h+(lph( 0hhtk p2btive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is comk,9l vpy i*x1nnected to an AC power supply. In this circuit, the curren*l1p9 yimvx,k t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit chr n+ fcomd+8we ,;porqks,/o, anges by what factor when the frequency is t+,smrd+f,qc ow n/8 ;rke opo,ripled?

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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 voltagej8k:x+ah, lp k across a capacitor approaches zero, the capacitive reactance of xpk aj,8 l+:hkthat 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 ofyc1 *adv 1t0tl the inductor and capacitor in a RLC serie tc1 *ylda10vts 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 d .wn8*bow,q /qu67a* zvo(fl /imsp3k r s4dddefined 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 xx xh* p(sw5avc9tjr,r. ;u*dthe circuit increases if R increases. When is this statemeu5wh* *(9 p;.xsajrx,dv r xctnt 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.1z8t2s dvdd)so g.z4x5r6x tt The impedance 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 incre8i3w6v d 62g:x3kpzii rrju0cases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series ee 6z/havt 451vucu 4zcircuit, the rec4tehavz461vuz 5eu /sonant 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 circuit that is drivenk bmxrg33 2p)j n)3ltp 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 l h*)fa9z/.,h-hg xmtat0fx 6 ct)jt bRLC 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 radius 0.10 m is rotating in a uniform m cx qcw6u8)-keagnetic field of 0.20 T. Find the magnetic flux through the loop when the p)u6wxkc e-8qclane 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 nunzh8;qw+fyn/g7o+kmkkz p 32, :hmis rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicula,y;+kkonk/n8 3hw +nfmh2: qzmguz7pr.

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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 rsmyoz)+:8ab:rkzh2g zl rg8::vn c w;otating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the lor: wz:mr2:: bzacs n8;z8l gyokh g)+vop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced 1w c4 wno5)t7zyb /anafrom $1.0 \; m^{2}$ 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 fr(ar kp,-j7pb m2hk9jzom $4.0 \times 10^{-5} \; Wb$ 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 hs9ml9v2m e fq1k1u4z92mwipl ujs: jf;6 i :o18 cm. A uniform magnetic field is applied perpendicular to the:ifh 2 se16;u4 :fs l9m vzo2uj mimlpjw9k9q1 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 and an area ofa)ixdd,01 wrsd6r r0 l $0.40 \; m^{2}$ 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 a+6xelf- hba*n1vro- zrea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where thu330s+ nen hop+w rz3ce downward component of the Earth's magnetip+ c30sehonzru 3+ wn3c field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular veloq m i1dvh noj74,v9hu,w.ph1fcity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fielv7, iq9.,vhmnw fo1d h1j 4hupd 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-8q .fcfh/+ nz/ux-ddo sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of are.lv*slk ,23lovozpoo75ly +h a $0.090 \; m^{2}$ 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 arkr1xjkpc 0s0e,5 ng. mmature. 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 fiele10c pnrskkg.mx0, j5 d 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 13*a: xsrorh,.ok. b iw00 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 construct a sim,g,e:3u qkf lk0 8vxgcple AC generator with an output of 12 V maximum when 0qc3xg 8gkef:kl u ,,vrotated 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 maxra 7lnn )ygx: .i.wepo99/r iqimum $emf$ 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 hbzth9;2t8p6 e:iq9onwm v ;f3+sdnca 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 .s9j:m7 el io.im5z w7l3gui uW. The motor operates on 120 V AC, and when runn.msezl : lwu9i3.7muj5i7oig ing 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 power s x)8pr2/a;anm4r7kv1;e ta/udfvctp upply. The operating current is 1.0 A. What is the start-up cut/2p8 a)7fr1aad /t ;;ur vxenvckmp 4rrent?

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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 sup+: m( g2t0 thd*yn)9 piue.lble5mcwxply. The operating current is 1.0 A at full speed. What is they nlcm.(u*ideh9t:pw)0gex +bmt52 l 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 l ; gc.d08x7vizx bl2 7nnh*vti+-dgoto a 24-V power supply. The operating current is 1.0 A at full speed. What is thnlixxv2bgl+0g.d 7t h* d8n i7z o-v;ce 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 reduce a primary voltae8z 8ow,jwm*ram2-b +/qv ry qge 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 cabd -bx hh3kn/0yi+ vg2e f39fuuses 14 A to flow in the secondary. How many turns are in the sh bynivf0xh+b29-3d/3 gukef econdary?

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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 e* r5pq6hhj)a3 685lvh. a,etrbh zsjare necessary in a 110-V primary if the 24-V sezt6)h,e85qhb6 l spha5jhe*a3jr. vrcondary 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 secondsz)vu 8d1.nt vauw+n. ary coil. If th)n audvuwz+t s 1..vn8e 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. h6 pth8 c.v5zygcl3r primary of a transformer. Assuming 100% efficiency, how many amps at 24 .p 83.vht gzlyr5ch6c 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 ofj8/k+ tyfcu .2d dans- a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on dd /tf+ u 2.yajcskn-8120 V. What 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 primary coytnm+i +5czb /dbd9y 2il and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the p idy9t y+mbnbc5/+2dz rimary, 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 hq 4zyb*e5tv:5t9 sy dias 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, what currentzs yt teyqb 5:*54div9 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 ,5ak:f7a kv .mrfw5/l nc2 gsnsecondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at thev,sf:lc k ngwm5a/ .r n5kf72a secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondar) )ka9 buq + zm-o85swllhxb-ly has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondarl ba)x-8om)w h5+l9- bksluqzy 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 j0hlo*c-3/ m i.: :nitff2w8phceu; t l:o dazturns and its secondary has 200 turns. If the power inte:* u:o ; t/zf3dnf jh8li-hmc l2.p ao0:cwiput to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagmts z-xyn3dxk+ds1daeh :8tw::b e6 8e is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secon 8sen -:ayszw1d :tekhxd8xt36bmd: +dary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of cu*9uheyqf5taw dtc7 )s0m -so (gn(s;b rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in th ( foqwbgu7ct m;0)-a*td9 5n(shessye 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. Thee.8nz xbgte 6l /f-m.z voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Findxg8n..t- fzbmee6 /lz 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 resistance of 0.jr*ht f)ug1h o,tmh uo+74 6dp60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to 6po*tr)hj 7uf1d,4ghh+ uomt 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 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 resist il;1l ugd8 ; hrnij;(sg)di1eance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy lu e8i1g ldi1; ;dlrinh;(s)gjoss 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 a* nl.u92,iwa9ibpdvo.pzu pk 9kjc8 1 j)r o2ct 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of a ralpidc9.p*o .kubnc )2owzvj1, 89kp 9iu2jt 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 4-9hs88+u auiu ta h7nm8 no7rw40 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 nnt877u mh 8h9r u+sawao8-iunot 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 carrieswwl t :a.t.hgf;-m01owkmbw2 a current of 5.0 A. How much energy is stored in the coil's magn.1 om-bwh;0am wwlfwt:k .g2tetic 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 resac d(o-urzs )/gz;f f1istor and an 18-H inductor. What is this circuit's z1)-zsar;/ o dc(uffgtime 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 2y;gqfu vdq0*) hh9rv r;jopt+r0h7eAC 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 outlet. W(zcrc cahk 30+6h6qqi hat is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resista7 d.wduljj7:a nce of the lajd7j.dua w7l: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 powe) 5bf bb196j jad90edq qmwq7vr supply. What is the peak current thj17adj qv mb9)0eqq96b wbdf5 rough 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 connected to a 120-V ac power supply. Wqf :tji5thxm9u 9v9i4hat is the power dissipatj94i9uq ixfttv9 5:hm ed in 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 5tiuoxslp 7c.3pr5 as ek3bta +8+ r)v90-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-W resi 9z.ura fdp4,p0z/hs pstor 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 resew)+7gxf r33iwsfol6b( .f nwistor 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 ofi6z.yndzcu; pxsx2bk5*d ts 7z; ;+wr 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 2.50-mH coil at m)p+d7/ea k) +.aim puwdf i -1wq+hfz1000 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 1v1je nw,sr wy,4h wq9,4.0 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 ) ggc/3qpnt 3xf49tx lW 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 g5 8ffdcu 15-iemevs )9k.g hwV AC at a frequency of 20 kHz is applied to itm5hi8 9ge suk1).cfwdevf g-5 ?

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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 1vgmf9 mn:;kml gm+ z2vu+z:n( 10-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 a 4uh,qz1 6okt(s .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 s, jt)oy (r 1dqr/b-ddfm -4kfhave 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 dott6 *rx mx4 8vz5novnt.q5 a7zes 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 will the capacitive reactance of a 0.010-mF81qrfc0.xu rl capacitor be 100 W?x01ru.lcr fq8

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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 l904w e v qlbw)bsi:5hcapacitor 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 1d2z6r x +d6dvx2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac6 2dv+zx 6drxditive 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-m-6upvset -w7yml,/t+qn 3 i l0lrfh 2qH coil, and 1.0-mF c hulqew 0rt-m vqlp6-+,l / s7tf3iy2napacitor 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 gwg0 bhdss*gi 9/,;xn capacghn9gdb ;,w ix0g s*s/itor are 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 connected in series with a 20-mH inductor, whawtdx )gf* 0)w6dnd za7t is the impedance wn )w7d06 *tz) ddfxgaat 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 connecic*24d0osm ntb lqi+t klrxa/9,4 l1o-ep +wited in series with a 20-mH inductor, what is the phase anglme,wx4s 1kltq 2oap*d-r n /ct+il i o0l9ib+4e 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 withn;n mc 7 73lw6cdg(sth a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1;t s7 3mnh 7wcl6cdgn(500 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-/p5 8;+ yzdfe (yrmgncW resistor and 15-mH coil tomcg8+n;(pd5 yyez / fr 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 ryrjx)k; zh3zv30woh1 hr-2y series with a 450-mH inductor at 5000 Hz for a total impedance of 4x; vy0zr3-)32j o ryhzw hhr1k0000 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 resist3ggyy3ttoa sqh7t+0mw z16s 4 or at 1.0-MHz for a total impedance o zs7ty6m1hty o3qswa0g4+t g3f 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 capaci+qy: e mpk f(+bc0ejx*tor. What is the impedance at 10 (pbeyxe:m jck fq++*000 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 10w+ ic8 ojaye*hly)(x7-mF capacitor at 1.0 kHz for a total impedance y*jh olwi(+)y ac7 ex8of 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-mnro cvcrs1w j0s+d+0 a8fbf3s6a)oy ,F capacitor at 1.0 kHz for a phase arvca,n86+)fo 1s ojcw3+rysb0sd0 fangle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a tszv;l+n bj 8wxx-50st qez0w1otal impedance of 45 W?zljz-s80x15 nt qxbe w;0ws+v

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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 w8g-g0hg1 qa1b 2 84dcdzpzcnk ith a 100-mF capacitor at 120 Hz. What is the phase angld 41hg-b0 np 8q1kgzzc2 a8cdge?

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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 *zvons04p d/u and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF c uop *s04dzvn/apacitor 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 resistor,upmrvu (0faj :v02dzm metq7*x w3v(, 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 rms cd,(vvjm0z xr(uqu0tf * 2avm37ew:m purrent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capqa 6kois)j *m2 p2i ( rlj.l4cvv.fue5acitive 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 flo)plm .* i2j roe.l6j(csqivv25 f4k uaws 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 3 wk;p2,zapmsp3q cs bu9:2d yseries RLC circuit containing a 50-W resistor, a 10-mF capacitor,3 2sp:pp9k y3 amz 2wdq,cb;su and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phasej6g1 v v(d6/g plkji78a1qgxwy xg, )o angle of67k(11jvgjlga 6x pqg dvow ,iyg)/8 x $40^{\circ}$ 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 = 108m9o p1 j:m hkigazt*,.0 mF. At what frequency should the circuit be driven in order to have maximum power transferredj taip8:9 ,omz*kgm1h 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 eqk b6z b7(gx(resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to azkq 7(b (eb6gx 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 krs /2;im p5jvlb 7nj5AC 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 imaa98p gtso1z3m-gz d0pedance of 60 W and a resistance of 30 W. What is the powe-za g3ts8mdo0z9 a g1pr factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containizqng. 84 5d p63bbnwv,p+ubto ng a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whebppw8bzgb+34.tu 5no qnd6v ,n 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 serie uojngw-qorngp -*:( -s?g-j rg*p u:- n-onqw(o

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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 freqr*8du)u iw9u zuencd 89*uurw)u izy 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 i;eg vx:z3 *yq,tash *v;vpa 7onductor for a resonant frequency oxa h37,tsag; zev v* ;:qov*pyf 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 series with a 30-W resistx0xosl5( idcza:oka+ t,-f)jor and a 40-mH coil if the resonant frequency of the cirj( f5a+,xkdzo lsao:)tc0i -xcuit is to be 1000 Hz?

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