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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 magnetic flux ekzg v+kw 6hj/*xcept

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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 en67biw;d p.bcn9b u3that 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 in a coil produces whatv+- -tq(w)t/dhw mqu, 7xznmo kind of change on the induced vm ut/t)mhox+dw -nz(q 7w,q-$emf$, 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-xz1b(aj gtv,g w, hx*o ep19 dk;bfdbr*6k4z the magnetic field through a loop of wire produces what kind of change on the i,4a ,zxf6(d;1 jbh zd*9krb-gbtgw xk o1e*vpnduced $emf$, 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 of change on thelicd4o 0l,+/aze znl : indu,li zd4/e0al+:lzco nced $emf$, 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 my i:0b (cjradt0 dxv19jy4i c0agnetic 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 indkff2 * ncs y;ih-wuq)k 4/j5m tg/1vbduced current in a conductor will k-kbt);wqjfu1 i vndh/5s4*y/2mfgc be 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 liesqc4mlvnlg5qn(9 qyvb -05 h2w flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationa5q9h4m5 (byn0nqqvl w-gv 2lcry 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 table. eelsr9o j6 -z6 A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the zj6ol-es6 r e9coil, 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 reg t93kaaz29,gocc 9 bqqion where the magnetic field vector points straight up. The magnetic field va,z cbkqaaq og 3c299t9nishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magneti pps 3ip0u/v1xxy sx82c field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of xx8v 2py spp/0s 3x1uithe 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 tabl6 oed im4:spa;e 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 disappears e4:d6a mp;ois?

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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 o)2dd0q xx s 44spgn1qbn a horizontal table and carries an ever-increasing current northward. Two coils of wire p04dd2 ) s1sxgqnqbx4lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pol iuyoglyk5i pey;0*amqt4 2;wz ,v, .ne entering first. As the north pole enters the ua yv.zey*mn 2,y t54;iop;lw0kqg,iwire, the induced 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 spvb.vly)km4 q; eed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of tmqv. ;y4lv )kbhe loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis lrtvzm-.4 p3)1tr. qpffzuo3whose direction can be varied. In a region where a uniform magnetic fielzot3p .r.u f-t1rpq4 )fmzv3l d 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.d a6 gl1rsq0lxy( 4zw6477dgl sd0xdi
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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 9w+ +9er5z ffvcry0f7 0wfbaathat 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. Tfeax n*rtr7.3 he $emf$ 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 noe:c3si o:s. lorthward at constant velocity through s l.o 3ceis::oa 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 angular *i ;y+npt ol;zvelocity $\omega$ 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 trap0g sdse 59jl/nsforms

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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. (uyk7aj .vytejx 6./fThe frequency of t./y.jvje a y7tfx (k6uhe $emf$ 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 devics/ b*wntquak(li)8 sg0a9 z0se 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 decdx,nj3du* 1ovice 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 secondz n,7 iv cz,vwor+n*q4g/vz8kary coil contains more loops than the primary coil theng/ikczr n *ovwz,n qzvv+784, it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loopsa3v 3 )nrxyov eif p7enf+ vui8j0+(z. than the secondary coil thevuv)a++n73n.iip y r 0jeo38zxefv( fn 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 poogbwh js akbv-/i/ h0bxr65 0w-e(3h zwer 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 resonant circuit,t( yj)0e-yrr*g/9: n aj mrt) 2jmbdxp

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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 inducto5gp .rde .e-a i9dlc3azg8h )yr are connected in series to an ideal battery of constant terminal voltage. eh gz- .938ypdcgi )r5aa led.At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor ap5rsrqp c*ig2k8 8jwc8,eeezl 5 d+g .re connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battp8j+eg52rwzeisg8.8q* e,rk c pl5c d ery, 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 inductan+e2,-dob j*a/h *,ob qanrz u(bhn *ejce 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 inductance L and r9nd/33 +n mlwzsj6b0 hr2yrrzh *c( ffesistance 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 ni+n(tpw,3rnfjd5*z battery. The time constant for the circuit represents the time required for the current to rfpn(jw+3r5n* z,t di neach

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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 inductors1dif p8d0zs) kut1y5 are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuii 0sz fp81kuy5d sd1t)t represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same ux wxlm*kdnyhk;+ * .g-,to:q2w- zqfunits 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 curreur)bj y9jy* 3; 7inakqj9 9dejsxqrl 95n,me) nt

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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 c(dih6 /-k yofan AC power supply. In this circuit, the curren 6c-yoif /kh(dt

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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 w3tt;;5h . cb 1yzw/lq/ vqblzvhat factor when the frequency 1;. qv/h wz/tvlc lbzqb;53yt is 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 Ab7 ib qix t6xz*.v/y:2;rnmzuC voltage across an inductor is doubled, the inductive re*bimq2zu tvy x/i:rz 7bnx; 6.actance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor apwt*h io;r6eg wlewu: 40m.nfvir)qe6 .z w*j/proaches zero, the inductive reactance4w 0 r)*em6gl:i qwj.ohurzt e*w .;/ienf6vw 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 t2( m9tbhdw fh9his circuit, the currendh2 fmwbht 9(9t

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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 circuit changes by what factor when the fr05d+0 ig galmq )idz3f8q uwi kk9h2y)equency isg5iu)+ 20zq9daw iy0i3k )8m ldfkhqg tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches z;zl2d(4l 9g( t opdmjlero, the capac l4ll( z92d(;mtd gopjitive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inducxp / /1l/(mthp(i 9v x) bixfla)k/yljtor and capacitor in a RLC series cirl /bilp9)vxix1t ( ya/mlhfx(/)/k jpcuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined ar1a i:wx hhpv rg)agi5. 443ips $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increas5 t6/oviqva 5ues. When is this statement trut6qu/v i5o5av e?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circgk c: /4x.t:txi9p; o cx8c4j.yvbxhduit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of*1 b aph)9t1uglfzs-s 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 c l;tq:np47 l6ix kzjc)apacitance both double in an LRC series circuit, the resona kx:pn tlqi;7)z c64ljnt 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 is driven by an AC appli )mwwpp.9 ed hf095/wdisn3l+v7q pnt ed 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 ciz2 a5lnsds 9j:xypxk/y0k x;/ rcuit 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 frevdk/ o,y x949,9eydm hh)acield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ame9)9/y9kor de4vych , ,d ahxre 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 :oicgg60haxb- m) b-z magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and x06bmgaoh)gi -cz-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 iz y2t5 /w dx6ywm5jm-6.rfkltr6,vkmagnetic field of 0.20 T. Find the magnetic flux through the loop when the5 wmk-62mx6,r/ tlj5kz yf6ytiv rd.w 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 loop is reducewj dkx- 3rw85m8eiz1td 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 jmyz x)f9t34kil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame wit7uv+9qoglw+1 hpa4* evw7 aykh 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 value of the induced+ guakao9h7y+elw wv1*vq7p 4 $emf$.

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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 d5j t7 tlr uq(*)wx090wv 5pvblf qp,ian 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 apbkv ymt523zbcl20 .cnd 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 horizo74 7e7 .p(pyuk.xuahwsuk m z3ntally at a location where the downwa7pskpuuz3 7waxh 7m .k4u(ey.rd 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 rotates at a constant angular veewta:gm*op n/k7- qb/4sh c)hlocity of 2.0 rad/s awq h*c4 :pgs o)e7//hnbtm -kabout a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-s)hcgu md noj7;7e4ic, ectional 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 area4 *+n+cbekbcv $0.090 \; m^{2}$ 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. Eac.z-iriwro0rov a 9--; jmlax8 h loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rot a-vr-- a08jx mlzrriw;.o o9iates 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 wiov8 zv+ly*ozs 8,( oggre 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 wishau-wf 2( remu7 mhizt6 s)k+g3 to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.057+a)2m ( uezt36r-us gfkmwhi0 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 generatoq *f-p7zx m)atr with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates ox/ ( obuav6z3k1nw 5znn $120 \; V$ 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. Them2t7v6 pcictndam6a5. 0 ajn3 motor operates on 120 V AC, and when running at full speed it generates a backa ni2d6.vc 0aat6pm m7n3c j5t $emf$ 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 ) ,+avjtx 72r i 4veiypy.wah9W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up,pyxjyivr v ta7e4 wh+a92)i. 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 czmo(p4elqp)- 0j :*;xpzq6 puf riri;onnected to a 24-V power supply. The operating current is zr4 l:6 qpx0q;- )i( *p; ipeurzfopmj1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-Vet 4-g4l7xn sq power supply. The operating current is 1.0 A at full speed. What is the bg e7 tln44xsq-ack $emf$ 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 reduc1kz. jm; b5nice 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 floxmk9bfyow l wvrpqs -lmlbj596 3x.p:-)ue.4w in the secondary. How many turns are iyqs: bxp lm5rp.9 4x lofm--l6jv3 e)ubw.k9wn 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 k mmxjppjj;h2g,ek 9y ;.fh( :many turns are necessary in a 110-V primary if the 24-V secondjkhyjf :km h(j9ep,g2x ;p.;m ary 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-t1rvk rj 16 5-u8ouhaiiurn secondary coil. If the current iai- u8rh1 vju1r65ok in 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 ezn( n5nbt +qomxkg*dm-6w j-h)6v n+the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seco5zb h mnnn *wdon(+e6gmt-xk -v)+ jq6ndary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil ofc;y; 4 mofmg mx-q8 7)i+rnbuj a neon sign transformer provides 7500 V at 10.0 mA. The p q-7u) fyxcm4m+n8i;bjgm ;rorimary 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 primary coilvv2 ywf rn59lkbbm8(t0c4 e2r and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary4cr 2v wl8ve trk(5mfn y290bb?

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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 turnbfb *96cj+r:h tcj0 rls on its primary coil and 300 turns on its secondarrfbhtjjcb* 9:c l0+ r6y coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and itsei+(vg: se/nq l0m t-u secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output msv et:/g+ e uqn0-li(current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondkoe ,f6aury ba9pqm +u9gk*4 4ary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltayu9obgk*e4a u 6mr 4, pk+afq9ge of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Iyja9kq gg bv655;.xrxf the power input to the primary is 100 W, rk6 jxy.9ag;x b5qgv5 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 voltaget 5ysmw1dz g7iu 5.wt9 is usually stepped up to 4500 V by a transformertd ut1i s95.y wwmg75z and transmitted through 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 at 120 V. The vm 3o 1r)g5csnax9 f);vzkrx2)3 nn)co gvdg1toltage is usually stepped up ;3nrvxcxg9rg c))1v5ztngf2k d n oa sm)o3)1to 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.

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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 voltage is usually stj0.j eap+2*qzfupv) .lm4ou b epped 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 transmis2.qm+bzv0e.paj *p 4fujol)usion 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 tota6 ppxuo j)n.z xt s89dhvk:1g)l 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 tpphkngs81j9d )vxzu. x):6o . 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 lok0w 6rgt wz6 pss/ o(4gc;9wywng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss dug46cwwst/( grk6yp;9zosww 0 e 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 at 1000 V. How much less po,z neypr ba:s03)em,s wer would be lost if the power were transmitted at 3000ep,:nsmy, zsab 3)0e r 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 be tr u8fs. mh07- qr-ut8ezdcii2i) a xl7iansmitted 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 xi if-hr8ea77d l.i-2)is8qczu0tum transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much en62)h/aw *;qs0qskqjxmsrzr 9ergy is stored in the coil's magnetic field?*0q q szx9);am6qswr2k/rsjh

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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 inductor. dz/97-j uu8bbo :rxesWhat is this circuit's tib j bduzs97:e8ou/x r-me 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 volt:t oljl,bbn m(d:amv4t eu6jyl60g- 1 age 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 Ati;foety, 44485elw:)4v chas cmu oxy6l ;rgC 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 outlet. What isgh p(rcy6nz3d 6iyj1: the resistance of the lamhy 6gj n(y31r:cd pz6ip?

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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 connectit*qp.f(g)gsom sb/4y1z* hi ed to a 120-V ac power supply. What is the peak current through the ifogyi mqt *( h*p)4sb1.szg/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 tz +-)re:hk ilphtjj*9o a 120-V ac power supply. What is the power dissipatir+ zkj e-hpl*:jt h)9ed 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 wvi1k7o zb6i0resistor 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 re8wok a1ooq+c3ta7l (-a5dwptsistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is b g6: kz)k g7xk9ilr1s$I = 0.80 \sin (240 t)$. 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 ao6psz xz66*e)*d uv hd 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 reaev ) 6e+ (ff4qa9jxr 9dxplro2ctance 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 havl pyt4enj 4*)l.n k9nqe 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessakyv fxcc r: a(/xkzb2jk.880 zry for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHy k6b)8e87qwt0qdb/+d1) xwf oapnl ez is applfo1a+by k78 )l / q6p8 nbeqtww0xded)ied 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 110acpat9 q(+dht 01.y tm-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 rezgoy9ofm-ybq (q 9.a;actance 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 rea) wn+ah/p( wmoctance 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 do*o8/ 8u)dzgwx 2prw xpes a 10-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 capac1vwoxkp-9 -tg itive reactance of a 0.010-mF capacitor be 100 W?9p-vxk gt- wo1

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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-m, 69+yuw1dxx zer u-3w/zpo avF 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 iulb8,4y(t xttnductive retux ,(tyb84t lactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH poy063)yrjx 4 fehrh35b 9ffqcoil, and 1.0-mF capacitor are conn )h45px0j qfy39hob re fr6fy3ected 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 resisg / wptf (a));nk :rr:kormp+etor, 20-mH coil, and 1.0-mF capacitopk; p rkgr/ a :w:on(ft+rm)e)r are connected 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 cd75z8r/e9skuwb w cb 1l1y 3ak7m vb;konnected in series with a 20-mH inductor, what is the impedance at 10w9;svbb51 d7 wk7yba r1kk z8c le/3mu00 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 seriesg:9ahm,6q ltr1u /sgoo2f4fh with a 20-mH inductor, what is the phase angle 6rlu gsga ft2f94q:o oh/1h,m 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 3osa)qw9a x1 kb5e6 njwith a 20-mH coil and 1.0-mF capacitor for a total impes96nxa51o3b w)q aejk dance 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 w2psk07tv0h c pn k3wzc:7dsh0 ith a 100-W resistor and 15-mH coil to 0z0s pvk7phsdht c3: 7c20wk nget a total 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- n 0yynszvouj:) ;nf* 450-mH inductor at 5000 Hz for a total impedance of 4ysuzf ) o0 n;v-ynj*:n0000 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 series67(u m.erz zegvs+7ir with a 100-kW resistor at 1.0-MHz for a total impedanc7e 6g s+ziv(7zmurr.ee 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 2;2uttp3 +s fbo ;vff8q)0yoslng y0pcapacitor. What is the impedance at 100tlpo 2 qby0o8)gs0f;+ 3 vytp2f ;fusn0 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 n+h3lsj m(tf/q ml(i b+eeded in series with a 10-mF capacitor at 1.0 kHz for a total impedancm3 sj/l(+h f+qtlbi(m e 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 at8xy e ,.:ugxqal ngo04 1.0 kHz for a phase anqg4xo n.ylx g0:uea8,gle 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-W resistor at 1.0 kHz for a vrtk /(ajk;nufz) *r0(zmi :ktotal impeuz kr*;) j(a(v/ nzmkikrf:t0dance 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 no+):)(u ux1kvfdo gpphase ug(ukd+ oxn:fp1)o)v 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 resistor, 20-mH coil, and 1.0nx zn/-b;/vmr-mF capacitor are connected rxmn;v/ znb /-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 -p um4gq64mzul8/a hlconsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H induct6g8apqlz/-uml4u m 4hor. The circuit 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 capacitor of capacitive reactance 30 W,0b6 m tfjgr65e k2:zqprj7eh* and an inductor of inductive reac7eb:0rjkqe2p 5* f6mrzt g6 jhtance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistopr:wdgl p .z:d i1yp :,q--o* etlf2uar, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power tqaed o:ppfg:.:zl1 yd2,- rlp u wi-*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 neces *iqr:sxr5qzl l-v0n-sm9t *osary in series with a 500-W resistor for a phase angle orr-0v:9 *q- xtoi5mzq* s sllnf $40^{\circ}$ 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.q*,* suur oip/ At what frequency should the circuit be driven in order to have maximum power transfeisouupr/ *q*,rred 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 circug7 enpj :dtj /9lm83jhe,/rjp it with 12.0 W resistance, 15.0 W inductive reactance, and 3:p7gj/e8hdjp9j j lret , mn/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 co294bsk6n v a(1(qndm t x/mwmircuit 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 ana d0vric4)b e pm4n60bd a resistance of 30 W. What isdp )0v bcrb0en4i6m4a 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 cont fjw) yds.(fs2ox:dx q2ra1pd: 0m8ofaining a 50-W resistor, a 10-mF capacitor, and a 0.45-Hr a)s2:f8.f dof1(xwm s2opjdyd:xq0 inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF cap 1: rkmstd1nt3acitor and a 15-mH coil in series?3ksn:rm1 t dt1

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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 ml): .ju9awihe 5r ,1sc*kdva.7-mF capacitor for a resonant frequi)d*5s9vu1,j wm car:ekh.alency 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 se/ s/xkp 9)2,weuwnlqm ries with a 3.7-mH inductor for a resonant frequency of 1000 Hp ,nweq2/9/mu xswk)lz?

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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+dp csn3 2g6ncfx(9ng resistor and a 40-mH coil if the reson6+n dc cxf29sgnn3pg(ant frequency of the circuit is to be 1000 Hz?

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