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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 u,tk( 9ft h6mk-i :kmci lk7c8bnits 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 that tunohwwk i tg;/6f*1 z4he $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil producesk(3g3e0bs*e *im n *k2oa*dsrlhzp0q what kind of change on the indues3bh2gq*0m3oe*pna*ds k zki (*0lrced $emf$, 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 f7/ga n1.g uei q;pdty1ield through a loop of wire produces what kind of change g;dq.e/t11iyau g7p non 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 widzr50,*,3fmut yy favre produces what kind of change on the induau* ,,3 rzd5mt fy0fvyced $emf$, 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 magnetib-ikq4c;nuyau: 7( ,zsorqc: c field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced cu1k;ed zo(h l n(yw-8nbrrent in a conductor will be ozbn(;ny8 we(-ld1 kh that which 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 vydu4ih9nlh j c;9 5q(flat on a horizontal table. A bar magnet is held above its center witjhd( 9;nil 4u 9qhvyc5h its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal t: ebopcfcd* hr-+ufn76 t i*y7able. A bar magnet is held above its center with its north pole pointing down, an cr if6d+c7:npo7f bu*e*thy -d released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top ijw1r2xr+kw-;. eljsy u.v *drn a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sensvl d ;yrk.jj. r*1sr w2+xweu-e 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 magneo .0,ddm(xg3zl gu r+/tpc*ph tic 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 the fiz/ p0(gg olxm+d*pd3r,c t .hueld 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 magnetics -jshir .jz.) field pointsijsh .r)zj. s- straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-in7ff5x+ yv;s g6+vvia bcreasing current northward. Two coils of wire lie flat on the table, one on either side o+vv 6xfv 5s a;i+yf7gbf 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 entering firs-9 1s*gubo(m w8 xpd06st4t4-qv ksilpa3zggt. As the north pole enters the wire, the induco6 ixw0k-gdt(t z4g9-*p3qb4 sg8 sm1v saplued 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 abor h*u8zikm1;(mdq:o f ut an axis whose direction can be varied. In a region where a uniform magnetic field points straight 1 *um(orim8 f zkdhq;: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 r s 8jmn -(bwp:7icm0f,5gzhiat constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the oriefn:, scm7ii whp(-j 5mgr08z bntation 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.id//45 jwv, h wefy2/ql s7jb6udhu;z
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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 thefo ,;sj:.0jh sfg7ptqi avz :8wk7c2at 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. 6 r)yyg9pvd:un+cv 5 d 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 eashf 6 o0ml oh:,kw/sl.et-west direction) is moved northward at constant velocity th.e,lkh ohf o:/lm0 6swrough a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angul aaipl,yq 0-k. *vrt2zar 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 tran*39 :k0fpiai-w uabvek)z,ot sforms

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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 revolut( q9 wvp89dpoiions each second. The frequency of tv i w98pd9op(qhe $emf$ 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 used t0: u(*mun7xrxuc 1tjt ick: zbw3 b2p2o

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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 devicesk*c0tv, b/;nw5susw 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 a/(ltv4odknii / a 6 +1lml*4t+amhv gthe secondary coil contains more loops than the primary coil then ili*m(1v /tnh vg +4tdoaa km4a+6/ lilt 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, if55 23mfhg 7 3hijuxswu the primary coil contains more loops than the secondary coil thew 3hm5ufi7ju32hs g x5n 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 inputhcz2yi 7ocetv4 tnpiso1m4;c(fl+z*43 vo q3

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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 circuq/k dgagj6mkf9) 2(ft3v dz f5it,

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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 a)p2v d6z (dhfqre connected in series to an ideal battery of constant terminal voltage. At the moment contact is m( pqd)f v26hdzade 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 j+ ju6zgf;rr4 are connected in series to an ideal battery of constant terminal voltage. At t4f+ 6j ujzrr;ghe 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 connectedndv20+ 7c wrkoukx5iwfg.9 5s 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 anh6bo ldw1dh3v./ m dx, $emf$. 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 bat *g7w,wtx;aa xtery. The time constant for the circuit represents the time requirww7*txa,; agx ed 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 connected in series to a boorm6juw /,h 0attery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease tjm ro 0w6o,/uho

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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 uni*. qfo,) +xooxlt wn1tts 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, 8r.;qa ;y1gxx4, cm4 ox9qoncwv j o1cthe 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 powerdgki( dj4/zxc7; fo0v supply. In this circuit, the currenj xz/c g0v74;(dfdkoi 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 i :as. n (hqcor3 9x/xd:cld4tfactor when the frequency ihxast:4: dnr.(/ ioldxcq39c 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 indui9u-ou2hu3v dtiqct1 +/hk7,bkonz, ctor is doubled, the inductive reactance of that inductor9ko,ibo dnt7+ uzi3q1/ kvu-h2,u htc

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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 indun 7x 7 p/cvz*lg3q9zs u(dflv1ctive reactance o(v1sdx9qlglnv/ f *u7 3pz7z cf that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power sl1bliuh y0i0/ vpqm*0 upply. In this circuit, the curre/0*m vuiq01p l bylhi0nt

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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 coy4/n.e: jiyhl (2ju gircuit changes by what factor when the frequency isgu:e(/yio2. h4j n jly 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 cuzfy:d9g+0 eeapacitor approaches zero, the capacitive reactance of tu z+efy gd:09ehat 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 inductor and capacitor in nh)wcc, ew0 0va RLC se)c0 hv,n ew0wcries 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 ador(9nq * 83ovvro 7+ijo 8r4xsol v+dn RLC 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 impedance of the cirlkrm0f m ep;3qr(rn23cuit increases if R increases. W r0kn2f3( mrme p;lqr3hen 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 impedance o4u,w )ogufr:ef 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 cw(yuc uf q52f0ircuit 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 c; uuh(ny4t9ewza u5.r apacitance both double in an LRC series circuit, the resonar;tu 5w4ynuz9hu (.ae nt 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 circ fi i k0ezy)n-:elv+sdj h*7 0az+cq:ouit that 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 cir 2n-0wsyb1n gzcuit 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 field ofu (f7tlrluk ek)6dlm.)ub6 3o 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel. rtdm)ubkkel6(3)of7ulu.l 6

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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 :1 am9 jtb41dmedpisy1t j*d6 rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and*i1d d91pdj 6taem smj1:4yt b the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magneticcy.5e8sf+pfgjs s(ja; 1// +kciy c bb field of 0.20 T. Find the magnetic flux through gpf+bj y+ck8/1 ca i.ssjc f;yb/s(5ethe 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 adjust)cjs*l poy;reg4h ofsg ; qe:7 1w7lm5able 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 co q*k*s(sv+t-kx6o jtfil 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 )v9r)qkl a3 s-xjmw6s 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 0.50 T to 0 in 8.0 s, find the average 63w xqa-m)9k )svsljrvalue of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and a8 /-z1ccrn vopj/ q6akn 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 jw h2gced4 6*v t7cqv/7jevzli,x ;0k 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 horizontal(y1ad vfgn/fem )ze r0t7 qg(0ly at a location where the downward compone7qef/ 0retnadv )m (0 1yz(fggnt 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.f+qfsw jqr q7rt+q ie;6)y;y is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field rqj qq)+yt+r;6s we q7.f ify;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 ld34en-f 0apnzgqm,p0oops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of aresg v4 p:t)-;bc 1kfcd ez8z;csa $0.090 \; m^{2}$ 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 *yw:n .+ wa1/oe wmqjsa 8g5sq80 rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm abouqa sa:js8 o1wywwgq+5m n e.*/t an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arm mt*(d/a;e,l0rdr /dgx c(qrea $0.090 \; m^{2}$ 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 ga(/xpc 6w)fs of 12 V maximum when rotated at 60 6c/ sg(w)apx fHz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with adb2u(ewsplu-,. *0z irc my/z 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 operates on rcd 4or 8 wm3lg(0zhi.(w0zqa$120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on w orl.t-9o 5ss120 V AC, and when running at full speed it gene s.s-wt loor95rates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power s4y *rwu2whypv zute,i0x t:*2 5xxp 6xupply. The operating current is 1.0 A. What is the start-up currtr yt*y64xvu2ixp,:z 2wxu x we*p5h0ent?

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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 connecteh zhh g)x e8z s5:rpblj3d2/*hd to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back zhrgx/ bs:)p32hhzd j*5h e8l$emf$ 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 vobl(xm+s. o* 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What vs+x*(mb lo.ois 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 primary volxtio p6+sfm8tj6 9a c-tage 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 in lc12yrmwl ;+ hthe secondary. +wlly1;rhc 2m How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns a7lx;m( rc:,r07o -kp*eake wv1u-dkrk +ekhu re necessary in a 110-V primary if the 24-V sev (7 k*w :-d x c r+okr7hurkelue0ap;m1k-ek,condary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turixb03 5yj fks;)u9v4decl +t ln secondary coil. If the current in the secondary is 3.0 A, whc 09e kdbvx;u5j y4l +3tslif)at 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 k 70pv;td bo0pi,e*xh6odf 6x a transformer. Assuming 100% efficiency, how mo ih706 6bxoxtfdp e0kvp; *,dany 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 sig,s,qcyd0k8 ddrb dyl8p5 s 1i8 4:qcgqn transformer provides 7500 V at 10.0 mA. The primary coil operate,,dqd8r qisyd0sp5cy :cd g1 k8bl84qs 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 priw l -r*zl3k,btmary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what l -rb wz3t*k,lvoltage 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 5p.d 6by*nyc; n,/ 1 yfbpncmg60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whnd/;6 y1f cnc.,b pyn*g5ybmpat 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 and its secony6l rh:-; +mnfbzlhozo t8a8-dary has 200 turns. If the input current at the primryl6b88hhz tn; lza+f:o-o m-ary 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 tu **rnk,6j j*sc:mb djnrns and its secondary has 200 turns. If the js :*mn*,r6*jjb cdkninput voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tun- d+:bv9d)trazy he( a,. sqbrns and its secondary has 200 turns. If the power input to t) r-ysd +:vb,bdtqn(ea.zah9 he primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u+pbppa 3h xzpvpxg::b+a/x:kdz /dc6c: kl0-p to 4500 V by a transformer and transmitted throupdxpplk/60z x:zxv- +ak: cdh3 g/ cbp:pba:+ gh a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current nq oc(.nm 4ge5a)f/ zhlpn74t 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 transmi7 (aeh /nlf)5pm.ozn 44gn tqcssion 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. The voltd6pmnz1ayq9: nh*.nr 5wk u+kage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistn5 6: d*91kmwhuq.yar +nnzpkance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A ghpy)f.1nvy-x uha+ p :enerator produces 100 V an.1 :u y+ph-vx)afhyp t 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 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 tct:w ,pom2s)50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In ordew:, 2mcpsto) tr 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 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 pfml:87 olf1 kvd)z7r at 1000 V. How much less power would be lost if the powerl7ml 8fz kf:vpr 71o)d 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 generator is 440 V at 20 A./w(9avxt; flu It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is v(w;fat9/u xlnot 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 coizt;pjk6yn5px / g .c6blcjxb y;.6zk 5p6t/pgn's magnetic 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 18-H inductorh;z-9dn9m r4 c: eqrdb. What is thisz 4;n dhcmr9rqdb:- e9 circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 r/ bmd65sytz1V?

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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 12d xy 3i6(.x2*h9j:k oykjyoxo0-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 ui: aejvi8qwg+; hdq . +okf;be w69d1outlet. What is the resistance of the lamp a 1e6 .djfweb;qd;w ih qugivko+8:9+?

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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. Wwkxod abkr+aiu (a-m8ab t33,ks 56kh0kf(u(hat is the peak current through 5(8kt,hdakuw0-mbr(3bxof k u sa3k+a6 ak(i 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 +obbtoneh4v;a:fe1 0 e(l 6zr is the power dissipated in the resistor?a4o ;1rnvl+6eb0( e oe:bz hft

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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 c-;2 )kzs kor3-q ztp,fxp7tmresistor 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 kt 9ja5t ag*nzl3d+ za07m ,mga 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 50u,gg:jr *pdcgmh8uq78v q 8w+-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-mH induc,ntchvkc v6, (tor 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 reactancwia 56 m*wze-te 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 induct z*yzsp2 3;klx k x-2+lky73 bnkre5plive 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 157ae gyl1x+rrn,:mm +h8tp34tc 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 indu;m7 f ouk3tv75a1bgqs ctor when 120 V AC at a frequency of 20 kHz is applied to it m1 t3 f7;bagq57uovsk?

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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 avj/pa2*c i) d.ks 2oll 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 capacitiv81xtx5tmovz ,b(mk m1 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 harkppl)l i9up ip+- 3r-ve 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a rz5nr57t zq+ xlq36fz m pqnld+,0r fb5eactance 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 op4is,j7 j gf*a 0.010-mF capacitor be 100 W?*pjfo7 gi j4,s

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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 xsk qvq(0+p o2pf+q(v 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 circuit with 12.0 W resistance, 15.0 W ind kpn4ye(b(fh99irpxk2m 8uf. uctive reactance, and 10.0 W capac2x9p.bkphuk (98fimy re nf(4 itive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mHd8(d4y93pcfg 0 pnvir coil, and 1.0-mdd 9 8pnyfp3(r4gc0ivF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle (bz1aj.o 4c roat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected41joo.( bc zra 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.2bkd6gh+ 2 v c)nmiq3gzyrz( inductor, what is the impedancec(db3)k n r.g26ghz z +yqm2iv 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 i5 qqopjlj h0b 5;ffmux1d:2) rs connected in series with a 20-mH inductor, what is the phase angle at 1000 )ofd5b2rjj 1q 0h:xfp lmu5;q 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 a 20-mH coil and 1.0-mF capacmwq yt7d1f- 1uitor for a tota -11mtq7yuwd fl 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-.lwj.e 1edoga 8hly a0jk,.i:W resistor and 15-mH coil to get a total impedancoalhaiwg l.j.1e yd:, k0ej.8e of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a toopqak8 e*)crj t:j ,l1tal impedance o je*,p1kj8lqrc ao:)tf 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 bps4 a9iw)pqt p,v7(cput in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kwb)(paq,c4p 9i7 stpvW?

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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 impedw 1n7 -n +mbl8 n cntm(o/ka5gue9g5sgance at 1000 Hz-ag/elsm +n79g5k c ob51u mnn( ntw8g?

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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 x* l eg/uu2zp0series with a 10-mF capacitor at 1.0 kHz for a total impedance 0e upgl2x*/uzof 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 capac;a ), s)vbafcoowmho rr4;:s3itor at 1.0 kHz for a phase an)m3sf )w,osra 4 :rbv;ah ;coogle 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 seriek v1 09ykc wxdk0qgs04s with a 30-W resistor at 1.0 kHz for a total impedance of 45 W41xs00 k 9wckvd gq0ky?

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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 9-cqed m9a8np is the phase angle? c amn98-qpd9e

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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 resisto)w8q4eewe 5j kr3ihtc5 hs,q 5r, 20-mH coil, and 1.0-mF5s8hch ew, 5qti4ke rwe)qj53 capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0ncw2 c-n:ae4v;loif91k a m txc;31zf.350-H inductor. The circul;a2n knomecw x9f f4;ic:3 c1-1atvzit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacdpo8a no;deg5q2-q )uitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sourc-o8p)q 5gd;udaoq 2n ee. 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 containing aymfnxg87hsy8)rqizmmx+9 4 ,nz-0 qr 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when nr-m9xz8xnzr y0m4qy) qhi8gmf+7 ,s 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 pha,0r.rf6xz/ hdft7 jw zse angle ofd/6hj7frtx0zz .r ,fw $40^{\circ}$ 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 = 20rt *f(y51mk;pyvp k(o 0-mH, C = 10.0 mF. At what frequency shoul5vo pr pky(;1yt(kfm*d the circuit be driven 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 series circuit with 12.0 W resistance, 15..- k,-dl, te 1cpykh ll(i4hqr0 W inductive readh (k1 i,yt.l-hce4 rk-l,q lpctance, and 10.0 W capacitive 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 cirz5zs *zq:s2be1lsqmty t25 xb8u;l*iej h a1;cuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a vupz9o,31h u .wc1gcm resistance of 30 W. What is the power factor hpv.m3z1wc c9 u,uog1?

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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 contais6 f)o ga 7,f 83vm7ougnr5trbning a 50-W resistor, a 10-mF capacitor, g ,v 8fs)f7n 3bru76 mot5oagrand 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 esbg0f- )kmqm3unf z1-24q rgof a 1.0-mF capacitor and a 15-mH coil in series?m-2qqge4bkf-rn0 z)u 1mfgs3

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor forne q oa,hqhw*s-z, 7d qybu )p.m9g4a4 a resonant freque)h7.q9pwq *mh y,ad uns-4, q aozgbe4ncy 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 withfb6-06p fyryg8/*kue t92femrn q ns. a 3.7-mH inductor for a resonant frequency of 1000 H2f0gs-qu 66.k8n f9yeyp tnb*merf / rz?

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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 305 /)pnqi 7lgt jk3t;nw-W resistor and a 40-mH coil if the resonant frequency of the circuit is to bep5w n3q)nig;t7 tljk/ 1000 Hz?

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