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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 magnk5*9dqkg z9fmetic 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 statz4vbwu(lcje5 as 9bnm*k gvk68/a a; ;es 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 loops of wire i: .zb:bli2z; oys4n yttgm ly9q fz-/1n a coil produces what kind of change on the induced iybl;y :4tqmsn/fty.2 oz9 1gz :lzb -$emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wit -db8tp00cj xre produces what kind of change on the induced 8px0 tcbtj0d -$emf$, 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 produces what kind ozi 0in jm/k/3u)fc bd,3 xq1akf change on the induced jfi nxk1b0 zcu)a//m idq33k,$emf$, 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 field +f(zv igj)kamqc75 b m4-qbr4an $emf$ 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 ah76hg7 esy vv,j,kjyu-:f b 5xn induced current in a conductor will be that which tendjvsey-7,7bgy5j uf6k,x: h vhs 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 q kffyn2 vdrfw q/45h ,6l,2 )/cbdfzabar magnet is held above its center with its north pole pointing down. The stationary magnet induces qa5fq// f2 4kh, z frv62fwc yld),nbd(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 horizonto9acn ru 4s09ual table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces ca9ruos u9n40(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 infxd sm:85wbx4 a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced c8d: sxb5 m4wfxurrent 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 magnq,3d3,h l-zdv*rhzr retic field vector points straight up. The magnetic field suddenly growsrz3*d lqdh -h3 zrvr,, stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table tohbikv/) 7t *r.+ jyvsec6eb y-p 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 f/kirye7e6-vy+ jvcs*ht)b b .ield 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 hom2blt; z3qev n+j p 9lw2+e1uirizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curz3j v im9;wte+bq22l l enup+1rent 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 loog:gp9p raz5o2*z r q9lp of wire with the north pole entering first. As the north pole enters the wire, the induced curr29 pgg al5 pqzr:9o*rzent 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 r3;j4s), r cpsdogsq9*0tfhcnyjw+2constant angular speed about an axis whose direction can be varied. In a region whes o2s0 rd 9j,yp)c*n gc;wr4fh+qsjt3re 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 i2p3 a(;vzlm hangular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientata;(2zl p h3imvion 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. f98(mr6 qfzsc
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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 an a).k lx h.8rgph n1c7mt07 s+t2 qbjmw$emf$ 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 ma 02gepkk*(dzpo 0/+szwj * licgnetic 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 i * ceduy85 f) ,a;+wfwr)abcjconstant velocity through a magnetic field that points straight down. Make a statement concernincf,ya;5rbj + wf8*)e )uca diwg 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 xmjgisg 6m;0y4k53b4 *odkp gangular 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 transformp si19 ci*sjma+it4+y s

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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 3:qg +;njxb lwfrequency of the +;jgb3l: n xwq$emf$ 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 devic 6,-zct8mp h)dj8yhrfe 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 dev wk; drwgxs;;moy4n9 :k+ eja/ice 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 g/cahe4x6 ay v1o;g+ cthe secondary coil contains more loops than the primary coile/ag +c6yv;xag4c h1 o then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the prim*;dx.uppz+caj6 ,ihy ary coil contains more loops than the secondary coil then6a zdhi ,pxpjuc;+y .* 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 xd*j4bx2huv1 7 8jma apl 3t7vinput

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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 i kuap 69 6zkls*w+z2i8:skjs circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series tos( m+go 4jztv4 an ideal battery of constant terminal voltage. At the moment contact isst( o+4vzg j4m 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 to an ideal battery fes 4q4aycrs v-m-6)5ix/o vm kh6:alof constant terminal voltav f i4 x5m o66ksr)4qslym -vaae-/:chge. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an d* 1powbdri) 8 ;h+cwg$emf$. 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 an k;aiaanz ;zp y8h q48m18fl2fd 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 a27s 7b uqrd6m(sdr sn0 battery. The time constant for the circuit repreu072r s(bdrsnqm 7s6dsents 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 coet ly43uqsc 8)nnected in series to a battery. The battery is suddenly removed from the circuit 3y)c84eluqst. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have thy :oz0 aaw+e7nbwro (98bbm 2he 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 curre7 gs z u/igrj;uhwshh 8*y(;9gnt

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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 powem3,mlg *k,biyr supply. In this circuit, the currenbmk* i,3m,ygl 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 factolw :p;)lqm*h*/upfz wr when the frequency iq;*lp :/um pflwwhz)*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 inductor is doubbt*fe;,m+ ex3,i+5ch+9z xjw*o9cw vx x qdhbled, the inductive r,i*j9b m+x3+ vxxxfw 5 z bwe c*te+d;o,hhcq9eactance 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 indu r+ fsw,/);ghb7detkjctor approaches zero, the inductiv;jk7tr h +bwes/fd ,g)e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circgg m/tn. :i/ljuit, the curren:gti./lmg / njt

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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 circuimrz/3xwv-z pkx9jd+(ijp z8*t changes by what factor when the frequency is trip wvr(-z8kxpxd zjj*+ 9iz/p3mled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capaiz +hxu.x fh8(citive reactance of thathixh.8z f+x u( 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 vo): tu l(g(snddql9c:)nirj ,lx)n. fa ltages of the inductor and capacitor in a RLC series cirdaljdtn.:) ful(snx l)g 9riqn( c:),cuit?

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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 pylg 53bltc9 -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 circuit increapzvbh(t )b5 b p6jvud hfk3 btx6;m(; 0qo6f8eses if R increases. Whq bbhxzp(f;6f(8 b3t5evm v6k60oht ; bdpju)en 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 le8 8;qm.hqln 67x72xud b uggrgu1*wimpedance 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 o)yx+a nph yuzr h7m 0((e:xi*cf the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series zj ,j18z) umvkw s1z-lxxhh6,mt/ xv/ circuit, the resonant fre,1-z j/x6j)t8hsxh vxkm1 zv,u/mlwz quency 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 is driven by an AC applied voltage. At resonance,t z+y2 u)oi5 ns3qcc)o

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a seriesk7v xi/s7 op9w RLC 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 inph3 kb*+/u*7)gk csxdm j tyc( a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field v(u* c/ kgsj+cb p dy7)m3txkh*ector 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 magnetic fiel:o o3,gahf,w9(tly :cueed. rn pkl1m56,ztid of 0.20 T. Findaye h,3mpd5g(.f: 91u leo,tzc rk,6wt:onli the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in opciao x 9xqd70/t0skrbjr5j 6v1 4:la uniform magnetic field of 0.20 T.v/alx o4r s:1jr7id p0qb c 9xtk6o05j 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 adjustable s x22s1+opsx:- qbyyq jingle 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 coil changes fro4 ohn u*/ykd(jm $4.0 \times 10^{-5} \; Wb$ 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 turn;cb +zy+w5 qays of wire on a square frame with sides 18 cm. A uniform magnetic fiea5++bqyyc;z w ld 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 value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tv6n o /mqre8ng/r,r8v urns 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 anv9y-bwq0t(kx42nn gd gf6si 4p2 wos8d 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 horizontalpn3 i5 a ng/p3d8ab3hbly at a location where the downward component of the Earth's m b nbp3ah3gdn/8p3ia5 agnetic 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 2r w 3rd- *gcog-ueas5long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magd53og2-u wasg*ec -rr netic 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 loops and a cross-seh0s qlw6v0iux 2o :*iectional 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 a(kb 2ysk,jhgt ;df:;6 yg/qjturns 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 loop is 12 y vn(1mef:q, gcm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel tv enyq (:,mf1go 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 turg+gulb* v :(wec (;mslns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output o x8+lreyzg6g o d( x3kvv7uh2*i98nd cf 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of t*xie3lvnx62ogk 8g(9dr7d cv+yzh8u he 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 withc y+ogz-q +kz1- h)nx6g- nfyq1ru( ez 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 operates on dfz6(xsnadr)/24 ed oo4 s kc1$120 \; V$ 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 resistanc 8* 4pdz9bjphce of 6.00 W. The motor operates on 120 V AC, and when runn98pcz bj*hp4ding at full 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.u/9 uoeopvh*k6s8 to9 0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up t ooh9ve u8/s6k*9pou 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 a 24-l.ufusp2 ) m,aV power supply. The operating current is 1.0 A at full speed. What is ,p.)uslmufa2 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 po jcl-ji0s azq53 l8jd6wer supply. The oper0i6 j58 ljj zaslcd3q-ating 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 t x-gnmfm6i8 /cia h.(is needed 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 o*ik sh3(ywa 8(obttj3 f a transformer causes 14 A to flow in the secondartj3b*8awy(3hkts (oi y. 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 are necessary in a 110-V primary if the 2x sv/q;b67ys )qig*6f,u etr w4-V secondary x 6t;bvi 7sq6 /u)eygsqf*,wrhas 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 h/f r6j +bl,x /xu+apxa 500-turn primary coil and a 2000-turn secondary coil. If the current in thex6 //uba ,+xh pl+jfrx 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 transformer. Assuming 100% efficieh)6grt;s uq n(ncy, how)(hurg 6n;s qt many 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 10.3b,ym gfq7(e;s hy5ltr;d5o g0 mA. The pre57 lyt; ;ms(o hy3f,q gbg5drimary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primmo4own0s e n36ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appl6seonw3n0mo 4ied 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 turnsf:ay(qrd n)-*ap -iiw on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the sqanr:y)d* -ipwaif- (econdary?

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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 ha ap0p8f tpuvy)bq*07 ns 100 turns and its secondary has 200 turns. If the input current q0upavtpf 0 7 )*pn8byat 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 1i)+u8: ep4er x ru5urj00 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the s ux8reu4e r)j:uirp+5 econdary 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 transformeiu ,t 8+ y7jvroak10vtr has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secon1t+r,08 jkuv vyt iao7dary 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 st z qrj70kdwb93epped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary j0k9z r7qbw3 dif 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 steppx09atl-q nnwnc zu;/)wt kj)/ ed up to 4500 V by a transformer and transmitted through a power) awu l-)09ntc/;qnwx/zk tjn line 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 current +xs ue. x;pgdb+p,gd2sp -zb,at 120 V. The voltage is usually stepped up to 4500 V by - d+ e2dpu,xg,x p+spzbbs;g. a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance oi*qr9w27 ffg mf 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating wr7f*2 gmfq9i 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 50 km long has a total resistance of 0.60 W. A genera:;ju;ew *el/ .yhfcc ttor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the tce tehuw:f;;cjy/*l .ransformer 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 * +reydi5kst1down a 6-W line at 1000 V. How much less power would be lost if the power were transmiye5r1d k* i+sttted 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. It is to /bmtk 4(3oix obe transmitted on a line with resistance of 0bo m (/ikot3x4.60 W. To what voltage must the generator output 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 5.0,4d e .w z;ak8o)b 0(ocqdvkm;c0cbxv A. How much energy is stored in the coil'sxzcd.e)mb v;q4b(cw v cao, 8o;0kd0k 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 inductor5 sia/v5l6 asynrr pca r) ea8(j84(op. What is this circuitc a )a( avrpo5n8y8s5 4 j6esirra(/pl'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 voltag gf6ul7wdm0s. 6kpc6ze 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 current?16xxyc k w,rfr5wbt1-b9 8dak

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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 intinby bbh 18r.e9 u6u.h,;lqqtj: rmi8o a 120-V AC outlet. What is the resistance of the lam,.r8: mq 8bb9qny ubeil;1 6uhjr.ithp?

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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 conne+f(sk*bkl me 6cted to a 120-V ac power supply. What is the peak current through themlks+* 6k (bfe 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. Wh4 t5or2dsugy+upy ( 1dat is the power dissipsp d1ru5tu+4g(ody 2yated 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-W y+nru,m6i kl) 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 resistor is * y 9;hg59la0auvbsu/gqk:tw$I = 0.80 \sin (240 t)$. 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 resistorac*yjz k4w7s. 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-mh8nx+4, m6bigxp rt 1rH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 10eg6 z-k i9kwq+00 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 b xqhkqnm4wrfv 93)zx+/:) dp 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 10asxv;)r 0xsj t60d6 xd00 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor wheo5-a +v*s(ipdvarozy3m4p 5 :3 tuhh xn 120 V AC at a frequency of 20 kHz is applied to :*dop my5v 4v paiuz-3 (xo tahsrh5+3it?

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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 xn 4o bv :ug7.c tfs.o.ehg1t82.50-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 aa* yxs wm s5tk++ yv6/08pntsreactance 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 .af+0 e r c .02fsfauzkzv3gx1kHz?

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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 hzcd0qrm, *-3me/vp n 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 o*la*xfhm: x6m90jb k 0.010-mF capacitor be 100 Wo:xm6hx j am9bkf *l0*?

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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 ar6x.;sk c3 uu/gh/q /ld em:n2dn5q rmt 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.x nre715g2,l25 s+fml obgso i0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive react7,rml15 g5 s+seb2flnx2 oi ogance?

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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 impg 98pmzr, s/uws sqbj96 w.u/zedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecjwmu/q z 8rup ss9bs,9w gz6/.ted in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, a7v cfp1 qk,3 ;i:nn9r (fny5b b4syszf2lxmf 0nd 1.0-mF capacitor are ck29sv:,fbpfn7r;n 3lzyx m sf 0ic(ynq145fbonnected 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 inductorc3/zkum(sko,l9k i1 l, what is the impedance at 100k3m/1 lck ,silzuok 9(0 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inducto io4 :4jo-1*ossrw8f rdii*xor, what is the p*fijx1- 4wsioos8*o dr4i : rohase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and y6x, w;p r8pkut)bx a71.0-mF capacitor for a total impedance 8xab y7,xpk; ru)p6tw 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 0 kzcu 4* p.-fw3wexfba 100-W resistor and 15-mH coil to get a total impedance of 110 W atuw.ff0 kzc-wx bpe43* 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)vf , 6v2wrscwwhb)2n 150 dyudf1;h4byhkce 450-mH inductor at 5000 Hz for a total impedance of 4w) b;4kbc6 h,yf1vd2 fc2ywdw0ren5ush)1 vh 0000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resisggaa, vun-d p6f3t )1stor at 1.0-MHz for a total ip-st, udn a)ag3 6fg1vmpedance 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 connug3oe j)25m8p0c9ye l/+gjaq-ao sfcected in series with a 20-mF capacitor. What is the impedance 2 g+f s/ mjgpe0qac8 59j-yal)uoc3o eat 1000 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 capacitor at 1.0 kHz for 6nn6rr gkq6tyf: 1 gewp z )gsx14wj*1a total impedance of 45 1ngq6sg6k j64 1r prw)we1ytngf:* xzW?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.9 jb(j+c zx)zk0 kHz for a phase angl cz+(z)xjkjb9 e 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 p-c 6x.i tia-x30-W resistor at 1.0 kHz for a total impedance of 45 W 6p.--ictxaix?

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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. Whatcvjd+g h8)jr )jd+lbb.cf 68 a is the phase vdg8hlj+c8b. )a jbcj6fr+d)angle?

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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 re9(nqn0iz 8 pjvsistor, 20-mH coil, and 1.0-mF capacitovpzin9(q 8 0jnr 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 res z3;w9aw,sahcck- p+ fj(z9hdistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected c -zkhp f (h9+wsj,c3za9;awd to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, andjf2v3g b9i3f;v ufb*j an inductor of inductive reactance 30 W a9ui vjf;b*3fb3 jvg2 fre connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a sehld-(0j.o;bofx0a-x 9 yz ppiries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppl ;zy.xpo b-l9-pf axdoji00(hy?

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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(qc7q*dp 07v oklgz p7 500-W resistor for a phase angle of o(07 zgdp7p*qk7 lcqv $40^{\circ}$ 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 frequen m o-ty,1 -vx6o18zlm 7hvjpn;c nbzp-cy should the circuit be driven in order to have maximum power transferred from the dri;1x- -n,bzz8 m7phlvco6npvj- t1y moving 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 outpurp+m44eqpp r*w )-f lkhfa+ b7t 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 12f4)m kh4a+-p*+pr be7wfpqr l0-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 cir7+x htm6mfg/p(zqf3v 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 impeda6im d,y:o l8bjnce of 60 W and a resistance of 30 W. What isdoy 8mb 6lji:, 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 containingt3 us4t 3iyem v mg;/5f*z7kfg a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectedm*4/5tstfeif7;gu zg mvky33 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 r k5/jlcx d ouaa+4l28of a 1.0-mF capacitor and a 15-mH coil in series?raado+85xl /c u4kl j2

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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 inp/9ta 0 zg lhn (:iruio 4s:a:1re-wdg series with a 4.7-mF capacitor for a resonant frequ tu0:w4gnarr/i-1sel:9og :(zia d hpency 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 fsh42asljp0 zb6w+ js+or a resonant frequency of j js+zbw24ps6a 0s+ hl1000 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 wiay, a ,s*w4;1u nwhg hx( 1df8wbytt0qth a 30-W resistor and a 40-mH coil if the hqhfndg( xb0stw,1a;*t48uww, 1y ay resonant frequency of the circuit is to be 1000 Hz?

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