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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 unit;)ujo.gcw; h g5kinp mg5;ya+s 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 induction states yhs46317sci 2vs45r ukupbu x 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 lqsdl;ry34 x3 ahr51rj oops of wire in a coil produces what kind of change on the inducedsrh13rxl3qdy ra;5j4 $emf$, 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 strengtloecl.d.*0 sf h of the magnetic field through a loop of wire produces what kind of ch o0* lc.l.sefdange 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 g(2 +z m lsnis+ppwta9li5/7 9mx0du xof wire produces what kind of change on the induced li wxsup0sm2i9t7mnda5 /+g 9p+x l z($emf$, 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 fk :uy3yoi,hi +ield 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, thei or*p(ctono:0 +zmh 7 direction of an induced current in a conductor will be that which tends to produce whi 7orop(0zhtom*+cn:ich of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tah- +un pjr e j/z,s.ozhq9+q+qble. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from above)rh hs. q+z+-jop/q,enzu+q 9j

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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 horizonta(/e fqu7jc6qi4 4tidxq8r )5ho d k(efl table. A bar magnet is held above its center with its north pole pointing down, and released.f5duxtc7ie/df4(h6e4jr q(qi8 oqk ) As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector pb+kgvbcc3 2 1;pc-kvt oints straight up. The magn+pcv -bckb1gk cv;3t2etic 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 m-b,yja,p 9cstable top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as ,c bam py-9,jsthe 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 magneti, x k.mfuc4/cic field points straight down. The magnetic field disappears suddenly. When viewed u k4 c/xmfci.,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 dv56up skj ,l 472fepse to5p4lies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on ei 6jep4sep,4f2uk5lo s v5t 7pdther side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enb;j2b-+r:pjp 4a fbrqtering first. As the north pole enters the wire, the induced cj qba2r+fjp;p4:- bbrurrent 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 s1 mleb)xu*9z cpeed about an axis whose direction can be vari 1ulmbxz e9)c*ed. 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 axismw9bqr(g- (fr4 oi(p f whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of r (wgiob -mr(f4qp9(fthe 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.:jdm8e5kb,/r0, rrfx3 eixbi3d r/a7wm /gtr
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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,,:bs(t )6y pg;iktjdh 9tl uk an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The50v:dr0ct/ba*ns hfz $emf$ 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 directi57mm8hzl rrxt-f92g+o4ep nv on) is moved northward at consta-gvrtprz82xom4 n59m7l f he+nt 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 rotdt4v5mjra w px *5vj8:ates 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 trgx4un gal ev(g8m. 4amod6 k92ansforms

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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 fr)xv..qwq5lnfcs p0:-r;hb p requency of twv5;l n-b:phrq)xps..f r0 qche $emf$ 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 devic6nf65:3qh1jm nm rp p7+)sjwlwggn;ce 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 tdn;rt ( yf,-/ rt 4w8i6ylcpcuhat

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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 loorpj x7zg pi4b-t hu4dqxo 1l 6c);9b7ups than the primary coil7l7 gu6pxq9o- u;14drxbbziphc)4t j 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 thf:af46pl4ag x e primary coil contains more loops than the secondary coil t4fa glp:4a6xfhen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inputs nqce u*-cd)xw6jh drda t) ;.6j7zkr jtx975

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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 circuitb1:). xi4wo- yu xveal,

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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 idealdtygw(/oz2 -fi.8 3l 2tovsa5jv b-ig battery of constant term2gigs/y-3j.v 8ia-t t5( vw zolb2fodinal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series z2 wu+a va82q,gtpmxelffslb+/ -*h/ to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, th+ pxmwzft2eg/+2f-l ab uaq* vshl,8/ e 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 vu u0:ygn2t-;0brktb5f3i:k r zo5 h mL 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 re8njdnlg( m c.rj)rn d/ n.f0z8sistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time const,o ponzyxhp:ibi/l / , dz11q/axpp,/i1dnz/ qz i ,yob1ho/: lnt for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are coj4bh7yq uj-42btr4xf nnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to 4jb44hfbtry xqu2- 7 jdecrease 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 h ;y3nxiwn *eaawqt1wh l /8p+gf.1 x8yave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the cuk8w czvh,* oj14h2u cprrent

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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 connecte6 xcz9;m spbm6d to an AC power supply. In this circuit, the currentbpmx9s6c ;mz 6

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor(b5wrz ej h(a. when the frequency i(. rw5zeabjh (s 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 ina2w pvtc, 9jb5ductor is doubled, the inductive reactance cp t95,wjabv2 of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches n/6k bgpkn7eh(k pn)7 zero, the inductive reactan k(pn7pne6k k/b )hg7nce 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 connec;q-pt44paw l14mcv0msp m1jcted to an AC power supply. In this circuit, the currenp44psqc0plmv ta m1w 4;-1m jct

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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 ac2ukt wg9*x wich rv(f-+e)zn 3 circuit changes by what factor when the frequency is triplevr9e (h 3xiz2) tnw*kcf+w-ugd?

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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 a ru5y*/hllt5xpproaches zero, the capacitive reactance oy55t/l xrlu*h f 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 0kgf,0 fqdg/finductor and capacitor in a RLC series c d0,kgfg0f f/qircuit?

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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 asd1wf.1l md y3enab*,l $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R 5u3cp+xo tbs8xs ;0mu;a8kg mincreases. When s mots3x;5;uap8mbk 0cug8x+ is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The i- m5 8vs7sqdycmpedance 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 +, or lndsf1u3circuit 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 c2mts ap2ai/ yksd-)dtx (u3o3apacitance both double in an LRC series circuit, the resonant frequency of that circua2(psy kt2d i3 u3)dt/sox-mait will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applkwhif 2 (8zug(ied 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 4 l u+62z* u 2h)d9rfsacusqcnRLC 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 magnetic fqnleis0z hv q24fvhj0; e5d -*ield of 0.20 T. Find the magnetic flux through the loop when the plane of the v0hjelfisv 5z;0-de4 2*qn qh 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 iszm,-o;v* ru na rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plmro-*az ,v;un ane 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 radiqhjb )lkp) r17us 0.10 m is rotating in a uniform magnetic field of 0.20)hpj17 brlqk) T. Find the magnetic flux through the loop 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 adjusn:fmn , hbkvep))/i1jtable single 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 coi378 -i.iw n ecilf.kk6aklkj6 l 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 on a square frame with sides 18mptx(spr /jtp. 1213e de(b:mu 4w*ayjkp4qk cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If*:r d3t1atwk.b44/p1epj ( jq(sp m xy2 mpeuk 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 withvk)e/laedw7a c3- e)i 15 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 anamv*1rq/ b66mk:hsj hd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies h*md x830yuv(pcpwl64 d.ax ujorizontally at a location where the downwar6ymx3 48 cdlpad*(wuv.ux0j pd component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long ict 1y -:hupqcer*/m*rotates at a constant angular velocity of 2.0 rad/s abou:i-1 repch* qty /*mcut a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 c,wu+zms7jw4 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 tuxsde rm p0h *fdg6x/ 15l,1uawjxly66rns 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 rectangular loops on its armature. Each looujy dxus1axg9 6 j4 uue.06 or16nuct0p is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be6j6e4y1sxnuux.9 6utuj c o0d1ug ra0 the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of m3rrqz -qvli yy,np:e.4 o .r5b:qh6nwire 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 ofwmht br3jjhb( :*i1usk6bfq0m )l.52b 1wd zs 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If qh1b ulww.di:z b5bj jb)2h310ss6 rm m(t* kfthe 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 ga a5 wcu0c9tua233 zabenerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a rl gbh /i0 0;s.2srzede(e iny3esistance 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 hav qh sse8u;8 lhg61db6be a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full spee hs h;eu6 lbsb68g81dqd 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 resistan/z+h9d*7u:xq qmk:;dmshba g akr+ g:ce 6.0 W is connected to a 24-V power supply. The operaqg;q:+:7/dak m+ kadb9*zu: gsr hmhxting 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 connectebi5 fjxk/-d2 :jba,rad to a 24-V power supply. The operating current is 1.dbk-, b:aa5ijrj/xf2 0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppl.w0v/r9 )emo7px m7mfsf 9rvr0let:ky. The operating current is 1.0 A at full speed. m9rf9m )07tsmvveol0wr:krxe p .7f / 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 o.5)abed2+iv2ix(k hom6 r a zpx;a+ aneeded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A yneflo ;r-fj :3. lb/jto flow in the secondary. How many tur :jr-elb o3n/ff.yjl; ns 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 turns are necessary in a 110-V prim la)akysv2(* wyxf2x: ary if the 24-V secondary k *:) faal (vsxxyy22whas 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 secon*t0k v68 hgh gs8xscf9dary coil. If the current in the secongs tsxh89f*c6 0h8gkv dary 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 primar;6tgtvsre fhrf /(-/:kvfqrjo* 4 k+ zy of a transformer. Assuming 100% efficiency, how many amps(-zvkfjvf4; /qe+t * kh/r6fsr:tr go 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 0rrjcd5r3z2noj t j .110.0 mA. The primary coil opera1n0r2t3roz.dj jc jr5 tes 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 its primary 455p r5vvlq qafkkj* m5osp1.coil and 300 turns on its secondars.5o1vj 4 m*5q55 pqfalvpkrk y coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secon:zgft jp2vo+z6i*hg -dary coil. If 120 V at 2.0 A is applied tjz6+-2 *ivptfhgzog:o 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 10uq oyq1ul 0c4-0 turns and its secondary has 200 turns. If the input current at cqu1y0-4ouq lthe primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tuf q-+iqpi *1*b*7fyp0fm zomtrns and its secondary has 200 turns. If the input voltage to the primary is 10 i bmq*pyfiq0+fm p1*t-oz*7f0 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 a3) ke.q7lh zle.7s )hpmje6w and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outpmse7l 36we) qehza).p.7l kjhut 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 voltage is us. *6gq 7ujdwt8w+fe24sjbuuoually stepped up to 4500 V by a transformer and transmitted through a power line of to4 26duge+wqf8 ujb.wou* tsj7 tal 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 st2 paj.3du8gx fepped up to 4500 V by a transformer and transmitted through a power linep2fdua 8 .jxg3 of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curroprqtm (g 62y(c f92fxent 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 the transmissi(xf6qpm22(ctfr 9goy on 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 ko(0 yyu : wxrlg (kq9vkdt)e:yxs)3-50 km long 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 wity vykek:(rkxdl)goq: x)t3(0 9u -s ywh 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 toa.jq9 --rfnt scq9x*dtal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the originasq*jq -t9cf 9 da-xn.rl 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 wo2 oe5 de udeeihvbi u.u) r8w328-nn-auld be lost if the power wer - 2 u 8iiv d8u23erwed-u.ahneo)n5bee 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 generator is 448pm gefm 305gz0 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator ou z 85gep0gfmm3tput be stepped up with a transformer 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 current of 5.0 A. How much energy is stored in the cobp.hs(s4w8v h+*qoho il's woq+h(48 .hs* p shvbomagnetic 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 con6n:dmuff u*-btains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constabfunu d*: -mf6nt?

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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 i7k5os2 b,bkga kdz05 on an AC 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. What is the peak currenu60(oakvjv 12(z uvjjt?

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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 outl 26j))6)e -re nzg8waq8vvvlifx.go n et. What is the resistance of the lamp?6x-linqeze 8))f8)vnv rv6 g wj 2g.oa

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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 l5)dpxpvf8bh.d(5zt-V ac power supply. What is the peak current throug(zdv5.5 dtpxb8h pf) lh 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-,7 zbcz3bndblwdt78-e4l*f m V ac power supply. What is the power dissilbmd7df3e 8t* wc-,bbznlz74pated 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 500)jvfc hk rn a7:c71as-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 mmx,snh( bu:vz7c: skkx )q81resistor 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-*jtju k 9urw).)b hvu*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-mHxh0sni gmp0yrvn2n4jx:t3 2 9 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( gwk8p5+eobilm-qt / 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 of fxqnv9gbq8) /inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hz? pa183cu1c hmj

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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 whenk1mk xet+twy9 )b95 q )yik6xwmkoj7 bx0h4s/ 120 V AC at a frequency of 20 kHz is applied tx )9k0b)wm k5tyqksobx 4/e xymwj 7t19ih6k+o it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current -gkz,+b vycil u1vz+4through 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 reacm z2c sx(9//7 m-ggqicx*xsi ptance 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 capacitive reactance at 10 kH1 165-pldim m+zph bzrz?

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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 ujic e4 q4+*ho10-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 rk5v;.ad)7e.yy qgqbgv,dt 0y eactance of a 0.010-mF capacitor be 100 Wy;ye7qq dy g,vtgvkd b.).50a?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and * / yy4u)99z,qfhubj jgx-ps e5.0 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 1ovb5; )49todp j0 cisx2.0 W resistance, 15.0 W inductive reactance, and 104 cv;tsj b905pi dx)oo.0 W capacitive 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 resiss-*v5i.atn+c p:bp 2v4 z ,wo5cmwlfn tor, 20-mH coil, and 1.0-mF capacitor are cz ,w4ctp -p5avc :i.w+ s5fvnmb2o *lnonnected 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 a8 ;c., to6m fz)srfhmc 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected cht o,6c.z )8m;rfsmf 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 iac /to s*/j7tf o4l ms2*x1vhlnductor, what is the impedance at 100fo vt*hm1/ 7oltx*/cs2a 4jls0 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 serie 5)jqfr y6az1is with a 20-mH inductor, what is the ph y6qr)ia 51fjzase 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 ne0)38brqbkfrswo 7hq4 eded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance 74rbwqs)3r8oh q0kb fof 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 resistorb i;1u -el t7cb5f;z nk3 vmvkaqk(,.e and 15-mH coil to get a total impedanc1 z(.;u cvvkkl,n 7k;mtfebe -qi3b5ae 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 *3imxo0du xq- )v e nx3c*rfm0a 450-mH inductor at 5000 Hz for a total impedancmoci*f3r v)-00dqxx u xe*3 nme 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 with a 10amnn, .v; y(uy6xag4g 0-kW resistor at 1.0-MHz for a totnn4yv,guya ga6m( ;x.al impedance 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. What is the im1t4:cokolhv3 d/w s9vpedance at 100 9l4:t1wdvchsv ok/o3 0 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 capav8 *2cgs(bm d,qq8re ocitor at 1.0 kHz for a total impedance cm(r8qo, qb egvd*28sof 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 neediqc42356, ecbi *n*ptu 4yrqrs v z,yaed in series with a 10-mF capacitor at 1.0 kHz for a phase ancqpie vb6y5izcn3 r* 4y4 q,*u2st r,agle 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 needed3 50b6 zgzin2gkttw:u in series with a 30-W resistor at 1.0 kHz for a total impedanct zku:b 36inw z250tgge of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is topio*:,cjhgrqm;:6g 6 wlr.xhe phase angle?6 lrcg*rw ogjxim:p,h ;.o 6q:

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coiau.sv 4v 9os6i +v+sfql, and 1.0-mF capacitor are connected in ssfov+isa9 v6v. +uq s4eries?

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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.hze)jpf m;-ea.3pgg9g/ lui .0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V 9gjalf epghum.i- pz;)3/.eg , 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 capacitive reactance 30 W, and an k ):+kx: :m/d6k)oztl h1fp og/aszwhinductor of inducti:dowztkk:oh/:6kh) 1fx/p+a)m l s gzve 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 x,d z wfssz3n1y-a4z5,wu1c ta series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to -1yxdzfs4,ww t,znu ac5 zs31 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 inlve:w 8 lm ( n1frnv:+a*uvp,o series with a 500-W resistor for a phase angle offo::+,nm1vv wle ( lran8*puv $40^{\circ}$ 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 = 10.0 mF. At wh duo:15 /(pzs6 izusvaat frequency should the circuit be driven puzv/(s ui1sdz oa5:6 in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac seriet 9x ( x3hpa0uip5 ,6az8qtozd fvib,.s circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitiv,za.5bqi6d ti0o9zt p3v8xphx f(au,e 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 is *f)oe 0nhgfda; )sex:2 n ql1f$63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resista9 8:ggj:k-ly - x9irawiglmg6nce of 30 W. What is -i8 w9j6gi9mk:g- :gaxl ryglthe power 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-kl5 88ld0 icima/82 qjg/y48hpn i qboW resistor, a 10-mF capacim085c/lki8/idp b8loy4ja q n8 q igh2tor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mHhed +5tb 2kl;pwl6drp b-8:pko8zz 7i coil in series?bpb l8k6 7edlz8rhipw2k p:; 5zo+-d t

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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 in6on m0kzb1.rm/mt m2hwit4y:b2 bxs1 series with a 4.7-mF capacitor for a resonant frequ/6ytm2bnbs mmm4w h2:i0 tzrx1 .bk o1ency 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 inductor fos.swp 3dtud8 /6- icwyr a resonant frequency of8 sdw6iwc pd/.st-yu3 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 serihex47z;gi b8ey2vh8 (ae7rbq7glcb 5 es with a 30-W resistor and a 40-mH coil ifz 287c7bebge8 7lhagqrb( h i4yxve 5; the resonant frequency of the circuit is to be 1000 Hz?

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