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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 magz c03ax0v8b* b)x yxhtnetic 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 induction states that tbfz j.k*1pd4 mhe $emf$ 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 ch) rqdo8fu ta7 02x-lpvange on the induc7-rqf2 0vox)ldua8 tped $emf$, 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 1f)ujr:e8l o ye;b+ qqwire produces what kind of change ou1qr+): e;byq jl8ofen 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 ofx 4ea )(/as,rn7s vsdw wire produces what kind of change on the inducednsw/ ,x4ss 7(a)vare d $emf$, 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 frrv:,sds 0y9 sh2z3z tb, nuyy*om a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current k8)jf*fg:q1:d7;v zxyqbah j in a conductor will be that which tends to produce which of tf:k87yzfdaxbhv;jq:*) jgq1 he 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 g( mwvpcv-) fb77 uf:tdwx6 8ptable. A bar magnet is held above its center withv7fp gwc(:t 8 xbu-6p7) wfvdm its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a h -q/grhnlku)cqm4( ltx/ a c e8p+-6nrorizontal table. A bar magnet is held above its center with +c/ n6 u8ra)-thqm xneklgr-lc/ qp4( its 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 magnetiq eb/ 6o0ce4f0fnkf)o c field vector points straight up. Tf6kf/n0)oq of4e 0 beche magnetic field vanishes 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 where the magnetic field vectoyo5xbe +39y * f1vulczg+z 7 7zte,eyeq/y6kwr points straight up. The magnetic field suddenly grows stronger. When viewed from above, what isqye1c7xg6e57e+u3vyk9*, z f zb wyet +oly z/ 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 the magnet7fcjgmhe1io-a k 1w+ z2r7di z .4xh/q;co5s fic field points straight down. The magne icr mo5f1g z/oq;e7hjk-f 1c74 .dwaz+hx2istic 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 horizontal4uxuj aia6vj4+r3l74cndgq 7 table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wijx43d 4rq+7c7ua4n luj avg6ire. 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 enju pwsp0 m i*itq.r23(tering first. As the north pole enters the wire,2* 3ts(0w iup.pqrmj i 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 rotatedg /pbr7v8t l:;ovhuw .ivjnk u/u)7w/ at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dowvi.t k):;roh nv/gw/ pu77 jvuw8/buln, 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 jclohw/5 k5iym5j7wq9 xe ixz.)/f6 jspeed about an axis whose direction can be variedm 5i/el jyxcwi.97 hjo56/wxj) 5zkfq. 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.6*w, pe)jozp r
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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 as 6qfplbh v cw(86)bik7f8dl, n $emf$ 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 mag/w2ai(-5b yo 6kqhu tnnetic 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 directc+nn j:x.jie8 /2nntfion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the 2tj8xe nn.i: j/n+ fncrod.

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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 vel0wpynzuu1mtfq(j2 s 3ii oi *w04 8-mlocity $\omega$ 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 tr9wl+e3ymntrq-c.73olx it - r ansforms

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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 se*+6thbvjf/ x k2j0 dvacond. The frequency of th bdxva j0j26t*/fvk h+e $emf$ 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 dehy/vc* p1a t5hvice 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 th 387hvm9unjf+s ii /woat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than xq/nka 6gx*0/mz yzx8;mnb5w the primary coil then itbgwx8 znxk0 ymxzm6/a q;* n/5 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 jt:(g4 j+6c rwp8o fibc zqk/7loops than the secondary coil then it is qir4bk pc8zc76to(/g: jfw +ja

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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 j+*ddb6q b mcf+1dwgqj,d n49power 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 ci 3i5,m5wb 4ra,c rixibrcuit,

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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 idm-nhuw,5gvlyit / 6 ,leal battery of constant terminal voltage. At the moment contact is made with the ,mt6hi,uvwlgly5 - n/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 se c sp+*hz64 4/nqwl9lhjtr6 kpries to an ideal battery of constant terminal voltage. At the moment contact is made wi *r4h6l9ntks+cw 4 6p zpqjl/hth 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 resistance1ge xu7lrp lq*k5ki49 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 c-.fhgthq5cnm z p(,q. 1i*wpqonnected 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 s sg akid*nb:f(dh94 x.eries to a battery. The time constant for the circuit represents the tns.dgkdaf: 9x4* i( bhime 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)mlgj7m(p-i e ntkg+t5 :e/m 47xysa 0hbcpj/ are connected in series to a battery. The battery is sud k57g(:iam 0y h-e7jpt/bxgsnj t4p m)/e c+mldenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sa l0jcj 5.e/ms00o3dtd+(ze lpag 9znxo9r,wyme 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 supply. On this circuit, the cmj urog2qra, itp-m :0-,iq ,zurrent

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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 topp,l k 0p1wm7m an AC power supply. In this circuit, the currentp0mpm1 p7,kwl

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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 chanlbww9:u,a: i mges by what factor when the frequency wu ,9:mb lia:wis 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 doubled, the v:cba ud;*kc(hi* b6minductive reactan bba*6u(;ci hd:*vmckce 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 aans09 g 07trw-qn mq3rn inductor approaches zero, the inductqst g0 q 3rmw-n90n7raive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to axkg2gqqzzud kh+*0*c6 25xs;hc nk e:n AC power supply. In this circuit, the currenq*z* s qz uh eck+520:khk;xx2cg6dngt

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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 circuid/z s2ak()ux(zgm5qh t changes by what factor when the freque(/()5a2zxzhu gdkms qncy is 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 capacitor approaches ze7;zpybzlk +4au ilb-2l*f1c hro, the capacitive reactance of that capacitorcb kzap yh*l4- z7+fu2b;1il l

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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 v n nc 2ofnkth)74n))adosx :1fch u2p jk:z*7voltages of the inductor and capacitor in a RLC se2fo))xz)j:ka17n dvnhch ctnpk7 sf 4*: u2nories 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 defined a s;t:uxd 5hnxr,+3wtts $\cos M = R/Z$, 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. Thoschc+ /:s(ekyres 9;m p;tp* e impedance of the circuit increases if R increases. When is thp+kp y hrstce/; (sc9so:m;e*is 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 circui( giz3k3zxvpv4zb0-/tpti +ct 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 cir ano)u3e ivf8(,y b daskr02*pcuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, the p75 c ldknw:p r6lu64qresonant frequency o6ql7cku5 l pd:4w6 nprf 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 dri.i aqd2:g dq.vven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit oftrj u.oz fq. hr4;12tccurs 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 rt 0ysq/kn exf50y tj:,otating 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 t5f/q e,t0yyj0 : nxskare 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 msfoy/s.nm4 hbv28j) 1ofo o4g is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop .fhs 1mbvs gy4n4oo8) j oo/f2when 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 df mr c;/ thu;gp:j(o9field of 0.20 T. Find the magnetic flux through the loop when the pla:oh(dj;r gf;u/mc9 p tne 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 spdsm/) m(a-go ingle loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a c)hm(yfih2f1s vfrka4n c307w oil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire g9dh89.b dnbmb6kr3fon a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unifo bgdb 38k96 mfnd.r9hbrmly 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 ofwdxc-rjh, tpj:u wh/u wa(:t sj+c6 :d2a(at 1 $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area .qlq8/.o sl.v o5j.ur l iumg.msiz+/$0.20 \; m^{2}$ 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 flievb0b fs-jl3 tij7,hv1z ;z 6xds horizontally at a location where the downward component of the Earth's magne, 0bf;b7zz -ijl3 th6dxs1jv vtic 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 constan3 wiu.cj4st n9t angular velocity of 2.0 rad/s about a vertical axis through39witc 4sn u.j 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 h: 8haiciuyfnt) uf8jjx7 8n4+as 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area ya*zpwkj 4p1 *$0.090 \; m^{2}$ 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 loopx j-toab e835h9i rrl*s on its armature. Each loop is 12 cm lonbrteja3 9rolxi5 8-h *g and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the 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 ve om(nf924fj u3 cl (9 asi/b.k8tatvturns 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 timyw 2bhd5, l1h,0fuz*g/ ; zv0uxizxo construct a simple AC generator with an output of 12 V maximum f,,muzgb i x 0h yux /hv52iw;d*zzl10when 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 gen1 ;-od44zajeglk h:-nds6sa u5z1l deerator 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 f16u zv0wvbr oi:t6g.have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor o6j8hu8w 9pg phave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generatesopp9j8ug 68w h 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 supuc12 x e s4hw);bxfoa)ply. The operatinwxau)h4c2;osxb f1)eg current 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 W is conwgp8-qf3; k( ha 7smdvnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the fa-wmdqvs h73(8gk;pback $emf$ 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 resistan 8lb/b*5eudd pce 6.0 W is connected to a 24-V power supply. The operating currenbe pdu*5l8/ bdt is 1.0 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 reduce a pri8iff (mz(x( hqe: b gqbr*-m*tmary 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 5ctt01yznj: ph ef( 2mcauses 14 A to flow in the secondary. How (c5 hf1 0yz ntpt2ejm:many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turiy d)t .hfb *qd(:tz0s0uv-lva 7v,d zns are necessary in a 110-V primary if the 24-V secondary has hza0 i f (0l7dd*.ttu:yd)-s bzqv,vv 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-pe /ifvs/ .i)h +camy/turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is thsh )m pe /c/vai/i+.yfe 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 t9.v9cz bcs rcu+4 )dpgransformer. Assuming 100% efficiency, how many amps at 24 V can flow 94z cpvb)gcr + c.u9dsin the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transfo ov 1p1:lp83x( nc u*8onkixd/w mzte, ul48zqrmer provides 7500 V at 10.0 mA. The primary colnl:48z qm1up ueo8 ,no 1wv *8dzit kc3xp/x(il operates on 120 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 ha /yko 05:chdums 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A 0 y:hmu/odck5is 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 primary coiq2 oh 6byi-:fsl and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is prb: of-2yih sq6esent 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 turbqq;n8m30 i gzns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expecq bim8qng;30 zt the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20yh*bv+1/ wkw i0 turns. If the input voltage to th*h i/b1k yww+ve primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2098g/e0 /pkziwrkn nr70 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frp8 k/ig7/e 0rn 9krzwnictional 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 voltagej-,jp2vos+* uqno x omt)- ;ac is usually stepped up to 4500 V by+j a;q*2vjmtos, ux-p- oc)no a transformer and transmitted through a 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 steppif5;7b*1hq bg kzm9qoed up to 4500 V by a transformer and transmitted through a power line of total resistance i7qz1hg bq 9obk ;5m*f1.0 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 +nocq5+krg/sg: upy 4-)u hvqof current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lsr5 n+)gupkh qg:/qu-vc4+yoine of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 Wd c kw-c;k t*fjr37k6affi(6y. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the tr*tkw ka; y cf(6637f-f cdjkiransmission 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 lonr866w c 7vfsdepfaea+1s j3: pg has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percenas sv3frj pfa6de+7c: e1w 8p6tage 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 less power would be e1rsxe 3;*nw xx(d /bmk.r)jglost if the power were transmitted a1s grd;xw )*m/ .xxbj3 n(eekrt 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 transg9nhn.yff;;nh f.n8 m j(ursu7nw 73kmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a t 7.n n f yn(u;r h3;ufj89mn7nkwfh.gsransformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a px vy*9+mu+movx8l 1acurrent of 5.0 A. How much energy is stored in the coil's magnetic field?mav 8y xv 9+op*u1+xml

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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 l2r z(tfoo+c;8edvl0contains a 6.0-W resistor and an 18-H inductor. What is this circuit's (zc8ldelt;0forv+ o2time 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 circuit where the rms voltage tv6bc,ihd,.oqw 5cj rgv33-p 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 placedaal:ecm3 -nsg(+p ; xr into 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-Voy, u/ki.rl -o AC outlet. What is the resistance of the lamp/, liro -oky.u?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is 3nbxqc6 mjw;stb4+ 4d the peak currenn46bcbjd+;4 3tq xswmt through 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 suppll(wgsgvigk- u1j :;7 sy. What is the power dissipated in :gjg1g;ls7 vi(w-suk 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 50ebtd 4)1xmqn9kjolaw-vi30 *-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 . ( avj2tuipbn2dk:3ca 50-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.: j(ph 0s32,yqhav7c.pwhx dfqw /cg 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-m5mq 3:p j ro0titj kj2fubk5 ,ih)kh36j3th3gH 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 bi g6 oa nvp )2m2eqex8;qm+*f1000 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 t3wa .1gwlu 8pinductive 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 necessaryh, .xi/6y z0iq3wf0lqrrgv rqhup ; 4* for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at app6 r sh1fh+z, frequency of 20 kHz is applied to i s6+frz h,p1hpt?

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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 througm z 93kc.nas qmt3v8,yh a 2.50-mH coil due to 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 a 4.7-mF capacitor a)n zq5 ro*:vq(1uy rqft 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 od+ zppkq: *m)awo2z -reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capuak ,*w6;zpdlj 2k25f 2ztjfp acitor 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 l(2grg.xl2g/fmcjn: of a 0.010-mF capacitor be 100 W?c x/j( n:f2gll.g2 gmr

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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 ;cv5r y n.lb5mh8n ke.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 q-+bep ulo+in+g6iy-,q ; k:lfat6giof an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c6luig:+-i q;pq f, lok-y6i+tgabn e+apacitive 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, 20hst87*-6 tamvoy ffz3-mH coil, and 1.0-ff6-sh7yo mt8 3 zt*avmF capacitor 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 k):tls5 1zrjn-W resistor, 20-mH coil, and 1.0-mF capacitor are connected slr: knj5z1)t 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-mHk uomumu-+e3s xj.;1ks+r 1lh inductor, what is the impedance at 100.lr 1u xu3uh-jokmmk;+e s+1s0 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 20o c g .fe:05xh9tpuqn4-mH inductor, what is the phase angle at 1000 Hz?5 pce09 n.qto gf:xhu4

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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-msn42tx )qziwkc9m6 ;s F capactcxq)4nw6 ;i mz2s s9kitor 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 capacita8 x7ml 0hjh,oynces is needed in series with a 100-W resistor and 15-mH coil to get a total impehxl,8 yh07 jmodance 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 5000 Hz for a tmmxj 4+t.dw3th. m r7tota..hd+ tw3 4xmttmr7jml impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series)a c7jf9e8ahu with a 100-kW resistor at 1.0-MHz for a total impedance of ) 7fjc8hea9 ua150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor.naa+vv9f3w p1 What is the impedance at 103pa v a9vn+wf100 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 netr7 ; wd/7ks6sojyfwj7l /swjq48wg6eded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of8 /ss6w 4 7/l wqjwk 6wroj77j;dsftyg 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for ab y0en:6aew q9 phase anglba6w q09ny :eee 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 seriez8pmhj;wiz0p m0hhf 2nlcp.i 4r s+)3s with a 30-W resistor at 1.0 kHz for a total impedance of 45 r8p03n0jzhhi i2.fmpw) 4;h pmz scl+ 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 120 Hz. Wm 0p-q y7unz6mhat is the phase angle? -0mn uy76mqpz

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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 15nnw8zp (1ugu;6 vzbq3ffqm 5au7 9cl500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF3p(unvqgf u58zma6zcwq7 b15 ; un 9lf capacitor 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, a 10.0-mF capacitfubp;8 -krf1pz+y8*t 3 w nghgor, and a 0.350-H ind1z -w8gky8p3prg f ;b+tu*hfnuctor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitix vc18.8ijdpc2nev19ze u,8j8c anu wve reactance 30 W, and an inductor of inductive reactance 30 W ar2ia njv18 cvc,w918un8zd juce ex.8pe 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 angx8gftw si 6jv,4j3w d6le for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and6gjitf vwwjx3 64,d s8 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 phase angc/rgeapg 7rh4 15rz w)le of r7gc/ag 5w )14ehrzpr$40^{\circ}$ 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,6r hb+ rtd1rh- L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from thehthb- r rr6+1d 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 klf,( cgk)z b;resistance, 15.0 W inductive reactance, and 10.0 W capacitive klcg ;zbf)(k ,reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit tk4 +trfdtyh qpvky-+2k5m p ek;2;e*is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance 11 rwyxu 9t1qfof 60 W and a resistance of 30 W. What is the powef1wt ur 1qy91xr 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 containing a 50-W resistor, 1a+5oiyn:ks/ * pj memqc0lm:a 10-mF capacitor, and a 0.45-H inductor, oka:n+iqy m l*10c:sm/mp5j ewhen 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 frerg/i nlf y ;2:zhuv7r/quency of a 1.0-mF capacitor and a 15-mH coil in series?r:g;fr7ivny u //l h2z

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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 capaci0u3rq nl uu.)t0af -6 uaxhz2ztor for a resonant freque6-u00naau3 tq u lf)zxhrzu2.ncy 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 neemic.*,uw: xit roye2; ded in series with a 3.7-mH inductor for a resonant frequency *ci:y;oemw 2,ir u. xtof 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 resistor and alfx h;t( f ramy/ 5jm6j,-p;ml 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz?t,(m yf/jlmx;ja m -;prf6h5l

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