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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 m30zxi3ww)p 7b scpbhv(g,l3 yagnetic 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 thc2ld0 kb vg9(je $emf$ 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 +dmc(. 4ft twz o*yl/q7s h7oua coil produces what kind of change on the induc*mo4/.lfu 77( qczhdwtsy+to ed $emf$, 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 produces wha3ifh3np8 4rnm t kind of changr4n8m3 pi h3nfe on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire p.cq): djtm zdh5-q1 i3ijyl/i roduces what kind of change on the induq3).htcm d :- 1jj5/lidiyziqced $emf$, 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 cyk6gd 9ky, ue b-20ndmagnetic 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, the5 r la-eccj9cj,u 5h;y8bbwm- direction of an induced current in a conductor will be that whhj ;lca j9 bb5,ey8cm- -5ucwrich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat o) ad1vnvn+q97qvqc mchym-6 /lti 18n n a horizontal table. A bar magnet is held above its center with its north pole pointing dq+l n)81 imnc n hvta1m7d9 y/c-qv6vqown. 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 euqtn9yfud 7y2 i5c37horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil,e7uu qnyt 3cd9 2fi7y5 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 05 o)y 87oydxts* d*jslyxge9a table top in a region where the magnetic field vector points straight up. The magnetic field vanishe*5t7y yl9)dsx8deg0* sy jox os 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 fri o pbofos-/0093griield vector points straight up. The gobs9pr f r0 -/o3ioi0magnetic 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 a r;i3kk4/w vataqq u)ytkv3vz0,+ b;ed egion where the magnetic field 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 disatwv+/)0u;kbq3 i yvqtvk, z dae43 ka;ppears?

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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 horizontaldf.s eqf14 d7l(w -ppz8j:ah) mcjos- table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either 1-e8 )m4hqpw7dfjl:s sd zjp oa(-fc.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 x9k8zn gx4y g(wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abovey xz(gx49kn8g )

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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 abo04wp)3 /y5u jaacxgqxq6 h6zb ut an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's ax466hy0z3g5uc ax xpawq/j q b)is 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 asiqul*nx,0:duefanc w+7lc/ 06b .i whose direction can be varied. In a region where a uniform magnetic fiias e+cc 6wx*7/idnalb:ul f ,0 nu.q0eld 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.7 ha+t .1jpogr
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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 th7iahx7c 5s8i/ej m2bfly++y w at 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 magnetillm kgwlug),e cf0-:)c 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 direction) is moved northward ato.v e4cm0h5fm constant velocity through a magnetic field that points straight down 50me.mvfhoc4. 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 rotatest.ydpm9s; 0 x v;r3a b+;zptk* at5btq 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 transforn: mmwvf::gt2ms

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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 offn 1j/8qaftz: the n:/8aqfjz 1f t$emf$ 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) kr pzn,n5 ua,uxr5 k4,.p ntw 87mzo5umi/rused 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 t pepc: ozhh3/xf7 acnd2tkb . s2f161qql;ju2hat

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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 second+d z7uzc5qlj9 ;eu,tyary coil contains more loops than the primary coij,9lze5 +yz u7d;ctuq l then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the seco8mudr(lx-yr 6-1 n cx1kzlxi-ndary coil then it is lmlx(8 cz 1d- - rkri1xu-x6nya

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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 pow d,z6y8o;aqo e8ihfo9er 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 resonaw/v *4xve+ej dvu4 yeaoy+:*snt 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 to an ideal bak/ c iovstc:o04zkdob 5)5c 4wttery of constant terminal voltage. At the moment contact is made with the):445kcb zvcdioo 0ko c5ts w/ battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideq t -,d(5xvkc8nb+ iwm+ ecghhnl093t al battery of constant termina 80m39nd+ct(i+xlqv, wht hcg b nk5e-l 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 inductance L and resistance R is connecte*j kau;fk ( xm4+r/g0sv)taxu d 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 to aye 8j, ;i)irusn $emf$. 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. The :yx y.n)j oa,gtime constant for the circuit represents the time required for the current to j),yx.nyg:oa 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 battery is6y tx9zuzbw 3feva7 51op/s-t suddenly removed from the circuit. The time constant for of the-t wv/yu175boz3p 6a zxe9stf circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exce i/s1 qjm66c zy g+q)i19*qvdylenp ,s;oysf,pt:

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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 q:a0vb 6kyi5 nAC 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 circuit, tht* exlo+c -*+mt.cfx )qe.gvke currenct*xv m.+gx* t+q-oe.fecl )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 chzj ge 7zut5a;j.f4: mfanges by what factor when the frequency is triple fmef:t; gazz4j j.7u5d?

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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 voltag .6+ 7v u;glw q m brrhmprby-:8bps+tc;y+ri*e across an inductor is doubled, the inductive reactance of that inductorqb;wpprsyb b+tvcmi 8. h6g r-:7*++;lmrru y

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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 xwc09 paexim+8 ) s4whthe AC voltage across an inductor approaches zero, the inductive reactance of th4 m s9xph0x)+8 wcaweiat 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 cont s: x4.aqhuvckrh; +*nected to an AC power supply. In this circuit, the curreq+vk:u;h t sx4a cr.*hnt

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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 cir2sc h.hkb 7vl0 rd:7ywcuit changes by what factor when the frequenccr0.h bwsy 7lk: 7dhv2y 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 apprf +f4u ckuh7x0oaches zero, the capacit+u k70hxf4ucfive reactance 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 induct ,7mnc e+oxi(vor and capacitor in a RLC series c(oi7v,ce+ nx mircuit?

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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:v8 h 1anqj1sx circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedin8-zqscw; (m)gj il .ance of the circuit increases if R increases. When is this statement truei ;l-njg(8.)imcs q wz?

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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 circuitv;j(x u40qdnv w n+se6 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 circui;ebuz uy+vw7hub +n4,9n3*ctj x/ 5u/bkuyp d t 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 LRCm)w9(h0jr8 xmgqi lm nei.h02 series circuit, the resonant frequency of that circuit)q9mw0i emih rx( m2gh0. j8ln 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 0qjel7a nn 4k 6s)prp4that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whe6dm rl yfwez9993wr p4n

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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 radi,6efav 1 3qcm+ nlgto,us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are ctl,gae o+,1nfvq63mparallel.

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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 dqmmsga :kg*)4d(p, wa uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectorm( ds* w,qk m:gpd4)ga 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 my7; k6vybrp 7 z;)txunagnetic 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 npr)xt;z y;7vb6kuy 7of $30^{\circ}$.

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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 reduc. yh ,cwg)6uji*w yz+zed 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 ffrtz5 os u+ 8v+h:fy(jd) v6sbrom $4.0 \times 10^{-5} \; Wb$ 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 turk*f22 4 lqintxns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpelfqti* k4n2x2ndicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 150as9:ti:4qec h vb 7mm turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and arec.o/q y *mwg x/h r2rh(0np*win+3otja $0.20 \; m^{2}$ 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 locat(ad9tux5gji4 ;th d-; i-vcv mion where the downward component of the Earth's magnettv5u-cd9iijhd-;x( g 4av m ;tic 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 cr92azoz+pd( v a(,liionstant angular velocity of 2.0 rad/s about a vertical axis through one of its e( d i2(rpo,ziz+ala 9vnds while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 lobcelfr , e0lx+62uhreg dnthg;699;nops 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 o9xwi5,u (qxsm ll5e1cf 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangu4g9fbhe( f)8 xh,eg jflar 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 ff89 hxg 4, eefb)(ghjrotates 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 b4csm;aum .8* )zegecq y(r p2100 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 simple AC generator with an output o qk8r8iv i;hz6f 12 V maximum when rotated at 60 Hz. A magnetic 8h ik6; q8rvizfield 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 maxqvx)7-s.ze 1p yrxe.;op6 a qcs(eg.a imum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operauds/s*)qwd szle6n4 0tes 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 resistanvk:knr phm 0-(ce of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generat:kp(h0n-m r kves 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 qa+u 27lee1rp to a 24-V power supply. The operating current is 1.0 A. What is the sta +7pee 1qulr2art-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 resistani(oi1+ *ba tpt5d0thh7 sh9 nnce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bb5ho p 0iht(n*ttd 7s9h1ain+ ack $emf$ 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 1giy*+ 6z. peu,lhmqe supply. The operating current is zel.my*u6,i+1qgpe h 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 primaryw2lawnf1 x; q*r2 afh:ce0dv7 voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A tob l1p dr.zyst9 1-cg2l flow in the secondary. How many turns are in the secopy1z 91dt.lb-gc rs2lndary?

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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 turnsrj 1hbygpe09cx)z ix ,d+i 1e5 are necessary in a 110-V primary if the 24-V secondary has 10rbgy j0x5z),xeid+ep ih191c 0 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 az,8 fi* f) atnrp,/ojm 500-turn primary coil and a 2000-turn secondary coil. If the current in the sj /*fofi a mnz),t8,precondary 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 transfor+g 4f7part9 2o9-rmf ai*q gofmer. Assuming 100% efficiency, how man9 *i- gtfgo7+f9a 4mafrqpo2ry amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10hsaxn/; kdy( 4.0 mA. The primary coil snhd xky(;4/a 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 has 60 turns on it52lx4md vp:o3qu pfa.s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presa2p4l5:mqvf o dx up.3ent 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 ook+6r s0/pgcqh wm30o n its primary coil and 300 turns on its secondary coil.gq3+pwk sro0/c6om h 0 If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns kepj6ji)h6(u and its secondary has 200 turns. If the input current at the primary is 100 A, j 6 uh)kj(ip6ewe can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. tljqrfqv*r8vn31ct; y 5w0ori 4x6 8tIf the input voltage to the primary is 100 V, we can expect the output voltage of the secondary 0ttiq q8l tf81r3rownvr 4 cj;65*yxv 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)m 0e( 2tcqizd 200 turns. If the p( i0ct2zd mq)eower input 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 6hispgo4p;ms9ac)t o :u 96 zu20 A of current 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 number soaus2to c:;p pugzh9mi 4)9 6of 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 120o 3 upabna.37r( 4piluqlh 73r V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totalq( p33 3o4ip ruhl77ualrabn. resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. w/immn bxjy.q*z.,:s 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 the transmission lij x:/n..yzsm b qmiw,*ne 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 ofen n*s8rwrdv).5 kiw/ 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 would).re 5 rdski*n/w8v nw be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance ozhn l-6b di 0j9b4hobh7k l3,uf 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, izhh9 o6bun,b lh7-k 0d jl43bthe 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 a7 sopmy9q7 p,ig91 aff 6-W line at 1000 V. How much less power would be los919 ma7fg ifpq y,pso7t if the power were transmitted 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 gener6*sn w1jysohvk6, he(;ris d9ungjr/ my0t3*ator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission j, /r yyh0smde;* sn g6jro36 1(*hvnwistu9k is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How mu6,/1 zpzo1twnu)m6ze* z2cu np cepv( ch energy is stored in the coil's magnezc26o* z(n 1c)ve mzn/tp ,zew 1p6puutic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an gt ou9:5r,aum 18-H inductor. What is this circuit's timug oar:9t,m5ue 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 wherpy.2*v* 8vawepcjr 9le 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 120c ze3bvvjfd o:i73 oar6; z+u3-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC jh8n j1f. ihyyl7ia9; outlet. What is the resistance of the la7y1n8i;hjyl afijh. 9 mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak c v/4yl l(ebbg+urrev+blyge( lb/4 nt 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- 5rplf jjj,32vh 4vac83 ez+euV ac power supply. What is the power dissipated in the al2, ce+4 p583zjhfjue v3jvrresistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W mxue60,fk 2haovsp9 t 1 n-7ljresistor 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 hgb9u w1r ,g3d5rk(8mju lh1xa 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 50-W resistor ivsr-p)r 8g*w50n8svs4dvbeq s $I = 0.80 \sin (240 t)$. 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 ofz;zgk ; kgsb(+p5qhcror 2 /b8 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 inductivete ib)u,vfs65pe r-3 n reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W aaw ;1wfs87ci 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 necessawsed-.j )fz kbg(5 j9ury 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 a frequencyf; 5 +pwnm(iw 9n 1te dh9jh6dt.x3kmi of 20 kHz is applied to it? +w6 et95x mwfd.hmd;nn p9ji3(hkt1i

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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 coi bw cu54d8pv-nglex,bn;kx54 l 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 capacitivp,rzo,xq.;3 nmyo/ ge e reactance 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 needed to have 50 W of capdhz32+ff( o oqacitive 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 kg/(fldo5l gsv2 e*t ;el a.3fcapacitor 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 ys97h h-i,n..no6myw9 msr6 cq/t3fso vgh c)a 0.010-mF capacitor be 100 W.h/cr v)7 gistmonw9q6cho9h.sfs3 y ,-m6yn ?

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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 tiqz03rpis)lm1gyox1z- u :,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 sera(uei1g;,m2: ztwbe :mf wu,pies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance?z;ewwmtibu(f, a: :1gpe2mu ,

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0()dzud7iri0 eve,: j5ivi nz7-mF capacitor are connected in serv nzdi:i)75ize(, j7v0ie duries?

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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 m i4 uo,1r0x2u),t lgaxu*f zc1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectexgml tucizfx40,,r2) a* u1uod 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 3h6;exyin8 udseries with a 20-mH inductor, what is the impeddn63y 8exu i;hance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH1 meo7v.7f 2g o4hvjnn- yg6rr inductor, what is the ph7 .y-vnerrog 1hgf6 on72 jm4vase angle 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 with han6sr3azs;yqrmj jy:/emj , 2wv8/6a 20-mH coil and 1.0-mF capacitor for a total impedance y;nm2/sv,r/e hw8a:ay jsjrqz 6m3 6j 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 resistor27c9aq7cg h wr and 15-mH coil to get a total impedance of 110aq9c2 wcg7r7 h 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 Hzgxxfaxfz577 2-m3m)c m ;nruc for a total impedance of 4f g 5cz-m2rx)amx 7n;3c7fm ux0000 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 100-3(* j6:fxd qpckzj-x* z4ryjk kW resistor at 1.0-MHz for a total i4 zp*xxdzfjr6( c3*:kjkj- yqmpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. Wh3x n8n0irz mafso.5 cz2)lf. t0p lg-yat is the impedance at 10mtygll3.)cpzinfa5o0 xz f8r0 .s2n-00 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cv c;6wkrz 9fh8apacitor at 1.0 kHz for a total impedance off ;z8rkcw6h 9v 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 a pf .i r9yz3ogc ;an8al)a *qr*ihase angle of cn38r*arf aqg l *i; 9)ay.ozi$40^{\circ}$?

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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 se* 1,yii k 3-mu dj,wbnfw/)uperies with a 30-W resistor at 1.0 kHz for a total impedance o,kpn3wyei b-ufij *d / u1),mwf 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 seric2a .vkn u27un 88uzo6r0tz jxyf/do)es with a 100-mF capacitor at 120 Hz. What is the phase afn2ocy )6td.juun8u ao8 zxr kv02/7zngle?

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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 reha1dd;p6 akk) m gxh)0sistor, 20-mH coil, and 1.0-mF capacitor areh)6daxd k;a hm )pgk10 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 con,; yrcsjz5. nisists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Wsnz ;c5,y.ijr hat 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 o* )oq2f)s*z f)j nqk(n)iu vvof capacitive reactance 30 W, and an inductor ofqfkzn)*f ijn* v)su) q2 v)o(o inductive reactance 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 h(fl)4vwu zu r/; nk0iRLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-u4r l )fn/zi(wv 0h;ukH 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 5qa3- e;ns:gao 00-W resistor for a phase angle ofsoq;:-na e3ag $40^{\circ}$ 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,j8zruux ud0za ) z x trp:mt9f*r8/:m = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have mu,: 9*p rjzr u)/xzm:zfaux8d 0 8rtmtaximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuityy0ax.ixm ofk :j203t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c3jymo xatx: fki y020.apacitive 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 circuhirxb 4 ;f0vj2lishfg;i8i86it 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 circuiteq1nc0(50g nk6zut.zzqm q :h 8q2n b a:rs4xh has an impedance of 60 W and a resistance of 30 W. What is the power fac4n8zqta xn h 1rm:sqzeqgcb05q:n0ku 6hz2(.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 faqb9 :qj z +ps pa+lolz boqk(c4iaz.- 9ez)*3pctor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a q (:iplqa) 3k -cb*o99qlp.4zs zjoe+az +bpz60-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 1oa.9-q k:ck jcerv(t 3pqyy; *5-mH coil in series?q3cj k-yk9cv tqo :*(raye p;.

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF ca+o, zz2isr 1zn*jjoa;pacitor for a resonant freque*z;2i+s oo,1z z jnajrncy 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 series8au4vi o dy xk2fuhs-+/.p5xh with a 3.7-mH inductor for a resonant frequency of 1000 o-/h fy xs2.8+u k45puhiaxvdHz?

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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 wifq8mu v37 r(0q9on gm:bg n,bvth a 30-W resistor and a 40-mH coil if the resonant frequency of thb8 09:bm ,vgoq gvn73fn (mqrue circuit is to be 1000 Hz?

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