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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 m+9t am (5xrfowagnetic 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 inducsi2qn( ( xqnm/nyj4 2ko 9ge8xtion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loop-7cx f5xll6t7puz ,*gfcn -t ws of wire in a coil produces what kind of change on the in wl x5-6p7cntfx-,tl7cu*zgf duced $emf$, 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 mamtf xd809j4k sgnetic field through a loop of wire produces what kind of change on th m8dtj0xf9s4ke 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 produ:9f pmw66 )sh,9y .u8q rodbyyjqlfn- ces what kind of change on the induced d qbfr9njfus lm86q- :, 9wp.)6yo yyh$emf$, 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 fieldc 9p0enz) n ee)u8nnz9 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, the0 /j.09 qsfg hai0/ lwb5vyiwe direction of an induced current in a conductor will be that which i l0w.bavg/w0jeq s/i50h9y ftends 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 on a horizontal table. A bar magnet x ( it/ij3- k/0zmwh- hc0cdsbis held above its center with its north pole pointing dowwt (c0ji-hmh-3i skbcdx0/z/n. 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 hori k txwiqxwkmc f8 rb-p4k(c3.;tp8;4jzontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it aptc84f3wt pk ;brwq( .micxjpkx8; 4-kproaches 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 www8nw .u6z(husgaq ,7fc j6.e here the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is thcsqw(u.uzje8 . w f6w, a7gn6he 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 le ,3rhsrru+a9hvel table top in a region where the magnetic field vector points straight up. rhh,9rs au3r+The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a rst m:h ma 4cf1kdnv:i/1h8wt 89v9rr horizontal table top in a region 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 disappearsa:98:c1kvrihr/8mhvtmr wt41d n 9f s?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing psm.n+1xn( lw;a)pxpr w)b)bf r86 uc current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the inducedb.6b) fp;+plxwunmrwrc (a)8p)x ns 1 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 entering first. A 8ex -lou70- h.flvfkss the north pole enters the wire, the induced-xfus78v h -0.oel fkl current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis vmf9n bl.r+6xncx1x i 6hxi76 whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the or.nx9 lxi6x hx66mn +7fr 1icvbientation 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 angul2a7--xp /unw 9uzq -gmh0j9prakc5bt ar speed about an axis whose direction can be varied. In a region where a uniform magnetir/9x9q uh7cg-0pp-az uk-wn2 atmbj5 c 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.kn+ abu:m( -6thggq 6x
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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 thaqu ;i56jy2 ract 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 agn ng2kw8r; )magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at con6:cct8a+cosk xy(5 wq stant velocity through a magnetic field that p6cta:sck +(c 5 xoyqw8oints 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 rotatestuz qax31e/w xa8h 6m1 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 2x*a w mz:ho(:dvqqtjh7o, *l transforms

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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 revolg9kjdh a4n27mnquc 46utions each second. The frequency of them 4adcn hnk7gj4qu296 $emf$ 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 us1 ls-b:d2 li2jmy9hh,v i nwq:ed 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 devicy /9lu-s1il4wv td*cb e that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil conejl y eh-c);4atains more loops than the primary coil then it )aehe;c 4-yj lis 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 secondary coixc322tc obeu )*h)nx tl t2 ho) *xc2ectt 3bnux)hen 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, theh ,ff-v )pess( power 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 resonanty04e xaioosk2ov 1;uv.io1 b , 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 arepy3k-oozyp j 5una 144 connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage po1p-j53aozu4y k4yn across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of coviv01sajwqpx:. p1 * x ;f/uwjnstant terminal voltage. At the moment contact is made with the battery, j:uxpq/v1 jf0w*ix v. p w;as1the 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 ind )xq9 uxqt6+6wcf8c -fjbdbptf/ 6tk) uctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inducta 7,ukuu(0crsx nce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a ba i op4u*5*y0ewqctmu8h 6: aiyttery. The time constant for the c*tuyoquya6h:0 c58 p* wi4i meircuit 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 areo7;zo jsyr/ww.n p p,. connected 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;.yp w7sn,wpro/j. oz 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 .le9v(m4cvevbj m.x 2me 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 5ii.3thkfcaq-k7 8 j pr3xa4q AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In 01flgy 7kebmi1 (vprd2q br+isdf 6, .this circuit, the currend ifieg(1b +l frpy71dbkrv2.m0 q6s ,t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frv8mup5 3; o3vl 3(msgnzw0v sdequency is trip3p;m oln0gv3vvs d(5mw8s 3u zled?

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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 vs ;zoppeqq b1,rt3p) /oltage across an inductor is doubled, the inductive reactance of that ) eqpo / ;1pszpr3q,tbinductor

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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 zero, the dc6 g xhxygoo4j24 -v9mn-st:inductive reactance of that coi oj-4chtoxgy: 62nmg9s-vd 4xl

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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 an AC power supply. In this circuit, t4b2i/(p2ouqr.z:p b l v)xopu he currei2bvo2 r.xlu4 zp(q ou)b/ :ppnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancn;ee2z0 rf9)6bme7jl2z gc rw-upog 0e in an ac circuit changes by what factor when the frequency is tripledj2e9w -nu ozeglpzbrfe 062)7mg 0;cr?

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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 h3 kv4). tc ww/be(*ikvnt(cjvoltage across a capacitor approaches zero, the capacitive reactance of that capie3n.(cv /4vt(*hwwjc )k tbkacitor

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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 i-8puy/tufx/:lc r::+ iutis knductor and capacitor in a RLC seytuxlf /r-ktcu:i:+i s/u :8 pries 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 defin-vpqjc)pl 6 4)v+qq xced 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. Thnpuy x6u j 7.pw4k(okcd0;u*le impedance of the circuit increases if R increases. When is 0k u(.u lpdwpn ko7 u;cyjx*46this 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 circuit increaseso5f6cqjw o.r 2 if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases if /mipc3y1 d5fm $X_C$ 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 capam;b(s6s suj;j - qy2*z hfqef5qcfn0m82s p4 ccitance both double in an LRC series circuit, the res fnsc6z*fs 2;qufqy2 cjp8 45-se(s;bqhmmj0onant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that iczr/wp 3 pir 5aqb5o7kx+y)jd+zso74h gy1 7ss 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 ocqp1)m2 m(xtsobqq j1vub30i. curs 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 radiumhsg2 ch ;r hg,i,zs8q76nu0us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the pla8ih s6h uugcz h2;0q,n7,mrsgne of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform(o3:5 x h6gdchequ zn+ magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane cd+3eqo g (h6n hu:xz5of 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 0h )yb4xptb9/9 fgdr7b.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop w t)4hbdr9xby9fg 7b p/hen the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loopnpb11*g6* n,obouyqjn hrnvs1 0ha0+ 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 coil changei4nl clmp5 .3ws 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 turnz70 /ksj67wiik mr; ml).hyueb t-f )fs of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from -j0m/wr 6h i7)s ie;tff )mlzkubyk.7 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 wit y d33bw b(lfvqba;, p*evzf5.h 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 and are1h zytue)pi,qf cq893 (7ostga $0.20 \; m^{2}$ 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 h1yoyc9)4j v eqorizontally at a location where the dowyyjv9 q4 ec1)onward 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 rotatesrd5jks*+-, 2mtwcr rv at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a cot vm2*ds,ck-r+5rwjr nstant 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 generatst n,iv r+rzw s/lr;n47qx* s*or has 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 mft.fey obi.eh9i u (p.5q r4-100 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 rectangula9+q6k.2ylsfp80om . f hkbriw r 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 yiskbf..r2 k6oqm +w phlf809 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 turns ofmn6ysooa 3 ns2dl) 7x/ 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 anmt) xg-h21:pv* te a:t hn1wwx output of 12 V maximum when rotated at 60 Hz. h:pw-t)1xvxeh gt2 nm* w:1at A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator w8gervlt*o u0zt74e +zith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor 4j* x:6kgj*nhcqy,d- bb f4 s ecj/;xioperates 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 havebyv(q;ot 8io 6n a7n.s)vf 9kw a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fuo;qstf kbv6a( 8ninyw7).9 ovll speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V py0/hgh+ wwy,qd ))ag eower supply. The operating current ))y/ 0hh, qywadeg+wg 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 connected to xmzd,fxhqeb9*z 2r3 3a 24-V power supply. The opera3dx*3r2 9fmz ebz hx,qting current is 1.0 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 e/ta8y*y z*q btr64zq*ket ;s to a 24-V power supply. The ope*6 er;tt q*y tq4k8as/ *zbezyrating current 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 needo*acbaupx jgpi):p 3/- 3me+ied 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 to flow ink6dt/p v puc :6d; rddr6u8.xn the secondary. How mar86v:n.;rx dpcdt/kpu d 6d 6uny 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 tuoxnah lrdh7,f (*c10v rns are necessary in a 110-V primary if the 24-V secondary hasv*al chf (0xhn dr1,7o 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 prim y28 d9g6eaqbmary coil and a 2000-turn secondary coil. If the current 8b6ag2y d 9qemin the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a traf:u: z(; zenv4o/ul odnsformer. Assuming 100% efficiency, how m zozne/d::l( f4;uuvo any 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 10.0 mA. The pg 1zlc)m o;t1*z5c0ldp *rg ybrimary coil operates o* o t;0g1d y)zlr1cbc5mgzl*pn 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 coil a ogkup,g;b9 c-nd 300 turns on its secondary coil. I gp go-;ukc9,bf 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 turnsg iry2s 9y9cy.whi1f) on its primary coil and 300 turns on its secondary coil. If 120 V atifh )9r1y wi9 gyy.cs2 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 fars3: og;r* /.m o7nvwbnwx6 turns and its secondary has 200 turns. If the input current.w* f som7n:orag/63vb ;wxrn at the 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 a1o-vs2l(+imeo k2znturns and its secondary has 200 turns. If the input voltage to thl(on a+i 2m1-so2k zvee 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 trans4, -nonm pg/v.ma :(rzswmq8cformer has 100 turns and its secondary has 200 turns. If the power input to. qg s m,4mpn8r:m(a-zc/w nov the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 botz-e7 u 8c2a;x hbq)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 of turns ino-xaq2e h)8zc7b u ;bt 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 n6c f,eyv6 0sx hi28wc 9ef/htg7;hiiV. 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 powerewfeft ng62hvh yc8ii0/x6c7h;, is9 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 12 2y9;ulps- o9ya ew+ez0 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 transmission line ilpy99+a2ze uos;w -ey f 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 ku( qsy(yqb mz;ar7 ixs6v9+ e.m 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 with a turns ratio of 100:1. What9si(qq;yv+ beau67z ms ry .(x 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 achqm(qhiy h7i)i )qn; 2kh:h(e;yk2a 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 li hi);(kih qq2ih 2)qn(meycyk:a ;h h7ne, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W linoypb.sjyrm**du *, cq go*jwi-1- (xi4fb h 5ke at 1000 V. How much less power would be lost i*so.*qokbjih*w gm(x5 *pij-,d1 c by -yf u4rf 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 generatoq vj,7ixyb7 6y v ;nu)0mwhcz0r 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 transformermyx0vji ,q0 7 z hb)6ynwu7cv; 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 carriedcgn)de/: g w(x2sub3 s a current of 5.0 A. How much energy is stored in the coil's ma(/esb:c )dwg32nx dgugnetic 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 (tqjc *ubs68b0c :d l:z4kwam 18-H inductor. What is this circuit's time co 6:: t*j(dmwa8slu q4ccb bkz0nstant?

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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 voj7 0r c /t;hi7(9pyoowyaru m74- pcggltage 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 cuwyly(et, rw2r9/zj 1nrrent?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Wb1 wc asy2v62v w1k4zkhat is the resistance of the law kzvks 1ybv42a6cw21mp?

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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 peae(m0b9+ c 3 nr cfw2usif2y ,rom8x4dyk current t(2mfdc,i 4yr+er mw c f2nxuosy83b0 9hrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What i j zb0yf7gphr 4 +lc4qfq7l,(gs the power disszg7yb 4 fl7+qc( pl ,j0hg4frqipated 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 50-Wa4,4xay xqqh) 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 resistoqy+fc madf( hik7p23/r 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 1 e 1c1iopb,l.qs hf-p p; u8a;euce(nresistor 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 a0/hd e x 6r-r;c7fsy*vuu ;kfe 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coi8elr) /r6nc kel 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 inductive reat0in:pv5exie-pwq ve 6 g5p6:ctance?

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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.+ l+z vzbw h(k k4i2+h8:junyl:dkHz?

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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 ox*4: )+q-wnvdqffqq tn a8a5 a 60-mH inductor when 120 V AC at a frequency of 20 kHz is appli)w4q:qa*+8f 5f-ndxn q tqaoved to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.1g g2 wushd; oq7)b6zrielbma3/-i7k 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 capacitor4 4f+82bpuw9uvu r(d 2 nqiwwl 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 c00 wyj))h jpv)cw7tj7cc2z laapacitive 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 1 q/26 q+chwuq(hj51w 2btk .t1 yxpjqz0-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor updimdzw 5,7c j e5de: g7)2jnbe 100 W5d5p7 iejndwu7g:)e d,j2z m c?

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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 0.0010oor l/aly+;y+kx f x(5-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series / a4ag0z:8w*bolmb ad circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capmz0/aa:bbl8 w gd oa*4acitive 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 ret0w9yes o 4fk2yw r p2c o1-.qofk*pd:sistor, 20-mH coil, and 1.0-mF capacitor areyet - op2kydok0c.f1w2 s *f4o:p rqw9 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 1xkfr0d gyk63*k kg91p9wjj1a 500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are ckkafjgkjd9 gx*kp w6 10r1 y93onnected 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 i aykzwo 5(4 sir4l0bb9nductor, what is the impedance ao9isw0 b l4a5(yz4k brt 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 eazf m04d)kfv 8a3i k+vgj 7k(series with a 20-mH inductor, what is the phase anglda+f8e0 fk ja) k 473vgm(vikze 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 serif9b z0 ,wvm (z(/huqsyes circuit with a 20-mH coil and 1.0-mF capacitor for a to w(u0s,9fqbz/m(yzh v tal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-(ji+ybw cw 1*kW resistor and 15-mH coil to get a totyjw(1kic+ b*w al impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH ing7 baa/e :y7zdductor at 5000 Hz for a total impedanced7 z:ga/baye 7 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 urf3f3zx, z6p be put in series with a 100-kW resistor at 1.0-MHz for a total impxzff z633 upr,edance 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 capo c9 ae(usw3lx/u (u:xacitor. What is the impedance at 1000 Hzw:93oue/uusclx a( (x ?

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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 capacitor at 1.0 c2 7mptb7a9 5o.ov nykkHz for a total y5.nok omab 79cp2t v7impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor of7wdr(60 dqxat 1.0 kHz for a phase anglf 0wd(odx7 6qre of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30 zf0*0igs.kvz 9 yi zyncv86t5-W resistor at 1.0 kHz for a total impe8znz6vc k0s5vftii 9g0.*zyy dance 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 the p1axg4o ny wmxh1rfql(nk9f9)f 4 du 3oc;8c+whase angle?lng9fxo+d)1 ;fno4w3mucw9 q 8(fxy1kr ahc4

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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 10e +mzvc(-stp x x1c.*y0-W resistor, 20-mH coil, and 1.0-mF capmxxte*-1p (yc v. z+csacitor 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.y dunvyw839 ;nt 2m2i epc1vdxi5; jp-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. What is the rms current in the cirp ;2pjy;e9im3ndy 25xuc.v 1 wtind8vcuit?

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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 re+h:ygr2 n7kd)mn3k yjy c z4g6actance 30 W, and an inductor of inductive reactance 30 W are connected in sz h6+42)jgn3mygkyn7 :cykdreries to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit dtm qxb-*x2hr.8h +qzzq.,s*0da jcp containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor z, 2h-.8* ta h0s qm*.dpqqcrj+bxzdx, 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 angle iz p: s1jexk--leh/l /o /1peh-il/le k-x sjz:f $40^{\circ}$ 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 what frh9b+e ab,d w7requency should the circuit be driven in order to have maximum power transferred from the driving so+ a,r7bdhbew9 urce?

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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 outz aechc-dg54y3u:ts vbb3v. zmrk;( 4put in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V p( e 3y .:au-vm45s4v b3dhtckcbzzgr;ower 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 iowuh+f.;o s8 qs $63^{\circ}$. 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 resistance of 30 W. ady ,*7 r9n k/ opk)hgajk+e5p What isepaydpao) /jg k *h r75k,k9+n the 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 containin5hzd 5xm/6 qsf d+3heqszr1;fvkm)0xg a 50-W resistor, a 10-mF capacmm 36q ;5xqdhfhze+x0fv sr k)5d1/z sitor, 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 rl(k ik0v/jplbk df24 g zf/*/1.0-mF capacitor and a 15-mH coil in series?jk/ 2 lv4gk/l/f fk0b prz(di*

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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 inaczl* *6+aod 1l/uvge series with a 4.7-mF capacitor for a resonant frequa a6+e/ov*l1d c uglz*ency 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 for a resona:.lew kt4qb9bnt frequency . q:9l4tkw ebbof 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 re ha z 6gc 8ni(q*eu(h)ngligm8 .iyq-9cx7t2isistor and a 40-mH coil if the resonant frequency of the circu m88q-ennc*ig y 2 t6q.iig(xuhi9 h)( cg7zlait is to be 1000 Hz?

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