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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 excep -ymlu )v0axoq -3cj2n:+zhvkt : fu(rt

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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 cdaegcvg* ; /:d2y v00n8wqcy 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 q7ue7uya *r0 j.wd4+wwr)v nsin a coil produces what kind of change on the induce4 a)u7sur*w.vje0 ydqrw+7 n wd $emf$, 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 throwx5c/ *qlpgd 2ugh a loop of wire produces what kind of change on the ind 2qwpcg 5/*xdluced $emf$, 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 loopd c15n.jmtohla 2t3u - of wire produces what kind of change on the inducctd-l12j n.3 otum5ahed $emf$, 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 frommk(.)ce62qq n x5qbgj a magnetic 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 directionsf;i /ft5)) bqvw 7t;8m hahpnsl0-z k of an induced current in a conductor will be that which tends tow tnptkshm) z l/0v ;)b7qi-sa5;ffh 8 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 barmbq2r) 1pbbvi p)9i b( magnet is held above its center wippvbi)bm(b2 1 )ir9qbth 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 table. A bar magnet is held above itsm -t-6 7nh:jy t)uhckb7h;dma center with its north pole pointing down, and released. As it approacmtm ;bdk- -7c6u)ht hnhya7j:hes the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a re ,6dl0v p60uqrs8:rrub+z.*aju nb0uwdi)kn gion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil aswvuu,k06dz+ur *n)n8b:l udbp s.0r rai0jq6 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, wg:;yw n6 m9mnz,xox region where the magnetic field vector points straight up. The magnetic field s6:mx xz gyw;,n9 mno,wuddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a hori(ueq1usw9t u1 imrrg/u (d-/je+ mcw.zontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current i.e1/ m+u9(uercsr/1uiq( udgt -jw wmn 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 ;jo 1ze 8 gpgiuudb)h6-mtv,8and 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 induceg-b e6,u8g h8mvpj;1iz) tdou d current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first.*-dzq .g c *mvnvmgk/0 As the nor* g *v/gdmqcvk .0-nmzth pole enters the wire, 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 speed abouts3x.ogn 0b fl;4vk jz: an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of0ovxg f3b .z4j ;lsnk: the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an6bf otfdnh243ixhg 21 axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatd1inobgt6hhf 2 x4f23 ion 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.tqa78bjb x (+xnd6. rh
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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 av0)rj;j5ywimdq) o9s n $emf$ 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 fie+ 8vp+wh az 83my*csxrld. 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 i6 n/m ,ruq)m/v4x kzgxul9z*( wd0n,uk,eqoa n the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrak u4)mz ogrux0zlv,, k/ ewd9q(n*6xnmq u/,oss 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 velocity ; g.mf1 p5j77taidcal.al8 ly$\omega$ 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 t2pw8k 7io:pa )wfv7 rw*cjt (pransforms

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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 jh -0uz pg,,ajd65kms6exd n.through 60 revolutions each second. The frequency of the 0pn.6e h jmjagz,5 d6xds,uk-$emf$ 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 unk.i5bt4n nps0f * c+qsed to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device t ofl(bnq2kynd *z( e9x.;nl5lhat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primary k15 qnuw9uhg 1+d -k.bcrf vf,coil then it is h,v5u f fc b+1-gn1r9k.ukdw qa

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondaryvx5a-qq; aw8o.;btbn coil thenw oax8qav;bb-q; 5t.n 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 inptl+us)i+go92-t be(mn . khgnut

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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 c73uur 8 x/iy,xs ib (c7ue,yp: fjagb8ircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batte2*j4gwoodn le+(t5dd , m7ic pry of constant terminal voltage. g dp(o*dl5ote4jcdwi 7,+m 2n At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery nl,aq0+luty :q6 adzh 64bvg1)v w pv0of constant terlwdbn0)1 uv6a,6vvqzq lt h +y4pa0g: minal voltage. 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 resis gpa2cnuuu(t8na )8wks- 6 (cztance 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 z e4zog 6)ufs 3u;dyk.inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connectkpzsg)1 6by e,ed in series to a battery. The time constant for the circuit represents the time required for the ckey)ps61 bg,zurrent 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 battery. The batteryn m)(gvo9zk.43fwmm.w gc lg1cn 0sg( is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cur.94gmzm0s)o w kv ng3 n(gl1c.gf(wm crent 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 uo clo ud9(v1.hnits 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 thisob w. *.tlaqjt*tnal7 6 i7z,x circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curv/;bu 8d cv,u/qihd(pren( ddpiu8vhc,;//uqbvt

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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 mqi.m z:sn6 i+xtre :5jz3*/m 7vebdbby what factor when the frequen* mbi/+6mz:v.35sexz7 e:m bdjirtn qcy 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 AC voltage acroigp 78rat-t puq (gt16ss an inductor is doubled, the inductive reacta gqptt18ut(-g7 i6r pance 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 approachgk4pbj xe-nrj/ wb4c77v 3/n d.ln,vhes zero, the inductive reactance of that cen3 kd4p.lv4rw/hn b v,bcg-nx7j/j7 oil

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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 conneco u+nk5e62ugr (dcqs2ted to an AC power supply. In this circuit, the currentgs2(ur qe 6ck+nu25 do

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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 facte:bcq k( 2gjmd) c8()fih *ypxor when the frequency is( (fyc )mpbqgxc2)ik:he*dj8 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 acrr wxxh r/da; 0ef,tlh9 80y.qyoss a capacitor approaches zero, the capacitive reactance of tha t0,yde8hr . f;rl/y 0wxhqxa9t 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 capacirp1 hw gvz;kx)/u ( u:sk23szftor in a RLC series circzwhv u r):g; uzkpx2(1s/3fksuit?

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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 a 3 k u). l3cqsbjocboxq (x)/tdrw2,c3s $\cos M = R/Z$, 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 impedal9 /g(+6,v:h ,yng9m 3 wsggoubyuctpnce of the circuit increases if R increases. 3ng6umypyc v+9(o/w h ,,:l t 9bugggs When 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 of the circuit increases i9 mwnaf+dz;xz *b,r/w f $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increasesv8 ;u zqtewbmi88d1lzx8p fp(6b*0ke 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 cibazezrn+bfb vafj 7f0 ot:36z 913y d6rcuit, the resonant frequency of v3b6enfao 7ra:fd 6b3zj y+z09z tb1f 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 dh2 pn3dz( xb.f* -cp szmpn;y;riven 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 c gleze1n ..nb w(u)fd/ircuit 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 fi 4h:+wiqcw(kr4z0uy teld of 0.20 T. Find the magnetic flux through the lo4w ziyw0qk u+tr4:(ch op when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20d,eyu1,(w,8 c92n /dbvx k mxoaqn8xc T. Find the magnetic flux throwc,dxx,n 8 u2kvmcodn(q1x,y/9 ab8e ugh 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 isu.) s y0ksi4sb rotating in a uniform magnetic field of 0.20 T. Find th0 siu. kyss4b)e 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 adjb8/.5c8h/ woo.kjo w lpk/gimustable 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 coil changes from89 rl9ie jao8 -:fnvby $4.0 \times 10^{-5} \; Wb$ 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 wir1tyvv ;sbu i*2e 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 i2v;uvs*1 byt8.0 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 tux57 -s;swj tsitra)n/ m v.y*w/ o u50r1bporvrns 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 andsj9luei6 9w3.kl7w dr 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 horizontally at a locationj3upv mif9rtn2/w)* b where the downward crpm 2inbu*f39tw/) j vomponent 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 tha )6r;hheukbo )t is 2.0 m long rotates at a constant angular velocity of))6h khreb;ou 2.0 rad/s about 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, ezeh2a4byam5 i+(tc -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 turnc fe0 ozk70kp4s 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 wtj)ef.rr( -kfqy *0x12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field oft*0wjr-r) kx(yqf. fe 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 wuzcr/5 be.4nwire 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,e w:sxq mv+3 n/ctm8c of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of t /wct8qn,ex3s m +m:cvhe 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 gen pe,37 dhsqz,perator 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 ope as6umm;p( xpum(, ju)rates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates o(v*2 skuhzgi ( rt ,7su3qgv/fn 12fsg/v73sh(v zg2 ui(t,kqru*0 V AC, and when running 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 6.0 W is connecfqz y5 kwr02+w9gw-q:yv bbz ;ted to a 24-V power supply. The operatz+0vf9wrg-qzy wyw2 qk ; 5b:bing current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected /j af0ho 4ir ib6rn jh-cl+kf4l q;w.6to a 24-V power supply. The operating current is 1.0 A at full speed. What kj4i0ln hjrfh- c+6w/fq4 .loa;ib6r 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 24gcf*kl 8/7 +ipb yxt7b-V power supply. The operating current is 1.0 A at full speed. What if 7t8py +/7c*xbbk ligs 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 transformekuy qv l)ouve )r7vk6 ze3yq5wl60.y5r 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 of a transformer causes 14 A to flow in the secondf8t 3/sekv*cq ary. How many tecf8q/tv *s 3kurns 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 24-1eo+kwskb,v j,jdmd :)ck 69 yV secondary has 1c6jbeskk:,y1v+kdm j o d,)9w 00 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondari.m z 81ts7refy coil. If the current in the secondary is 3.0 A, what is the current in the m zt7r.1sef8i 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 tza.hi0)qco* (o2pwk7 m dh 6jhransformer. Assuming 100% efficiency, how many amps at 24 V cani7o*c.m0hjaoh p(6 z)dhw q 2k 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 neo4tamg -oc/ or.n sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the pog oarm- c./t4rimary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secoqz d4la: rp.d+ndary coil. If 120 V at 2.0 A is applied to the primary, +l4.d rda :qpzwhat 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 t l7yk(*c j *bi0j8awkzurns on its primary coil and 300 turns on its secondary coil. If 120 V atckj8w*y bkjliz07 a*( 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 its secondaj(ocajc3:*rl;xi6re- d/ y pcry has 200 turns. If the input current at tc r a;i/j3xjcypc6 r:-eod l(*he primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. l6fax9syu20 z If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary t a ul60x29yzsfo 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 secondaryatf-2/ ;qtr zyxxh1xr ;uy+)n has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negqxx;+a-rny/tytfx uhz ) 21r ;lecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is us. ec 4f-)p oa +d ku)+m)xzxrkzmw6(rrually stepped up to 4500 V by a transformer and transmitted thrx+u)d)+z4wkc)xf(-r6 pmo makz . rreough 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 mpqtt,sw0 fqrg+ d3xi68d f g6wk(u/-fz4sy 7A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through /fs4y68d3sf6q t+,g g r7qm (ktipw xzfu-dw0a 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. .z,r8k)yrma jThe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power likm.jza ry,r)8ne 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 kld9 s1q-fgyn c)r*3i jjqk2- em long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up w-slr2jf1)3*ge jdnq-9 ic kyq ith 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 r-7ypk:zww7aie 4ldaz7 ok52v ba h:;u esistance 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 turb;52yaeuadlvz4:7:wpowki 7 za-7 hkns 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 lingd o( (1ueo qfun+z+u.e at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead o1eoqduf+z(u u.go+n(f 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 ek 1kymy- 1eg v4x *:b6zrfz8pis 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if zbf:1z41e*8y-ykk 6 v pmg rxethe 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.evl/ 25b2p*f wurh kk a current of 5.0 A. How much energy is stored in the coil's.p lhwfbu*/ kv5 r2k2e 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-k-q)cpu;bo*u3 , :9wiy ql olnW resistor and an 18-H inductor. What is thi,ulq p3:ok li*9by; c)uqon-ws 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 Aye1duo hd;k8o(6z l7n C circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What ij/0r j/xb439slkp xec s 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 is thx)9*fws ermq2fw9.p j9nmjf 2 e resistance of the la p .jnef*j9w r9 s9fwq)2fmxm2mp?

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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 supplfr(s s o8opk ka;* tzr+x9e73tk.7l nhy. What is the peak curre *nxfkz738 s oethaso +rk9(trl.;k7pnt through 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 sum/8 1hiszd3ph(h-q fqqjhaggr3 39x6/ mmk v7pply. What is the power dissipated in the resgjmk 9/v3zap 3/3rm 1hdhx6 (ghs q qfmq-8hi7istor?

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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-W6c- o5p *tcs 4-c-watzd-vxuf 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 rfh -6v0k*overuwaw:4) ybx(k esistor 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 l:rhou 6f/y** kdy6bm 50-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 inductor at 60xtggxd44w/ ) r sv)7wb 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 inductive96 l(jr:- tvjjgeuc c;*wvtd. reactance 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 inductivq t:ixaeza 5krp 2 6hr;8w(g1of)g 0ahe 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 *.0cn eityz3t157 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 iod/fxb.k5.by n a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied/bxb..f 5yo kd 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 throud z 0-g(zrvp(sgh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance ofj+8 z5 rixk4bj 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- wclogcmab xtv8e1 0 2jw(2k5 have 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 reactance of 1200ydz*.lt+ l;oy tz)) ye 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 capaciti7crkf+5l; un dve reactance of a 0.010-mF capacitor be 100 W+7rlfukd ;5n c?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?zz,6t6bnx6h c

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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 circuiz:zog: 3xw)e 8)dvwzdv7 b1att with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac)taz3x7we: v vbd8g z z1w):oditive 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 impv9gaz4ui*,+k (i4w u lp j7hzxfja42wedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF za a4i wlf4 ,wji*h9jzgxp4k+ (27uuvcapacitor 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 at 1500 Hz ywf1k yjgfe/fda2x:sy ; y :,:if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedy 2y:d/g ;s:1ywy f,: kfaxfej 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 inductor, what ek hs/fv87ud-ckh:- p,cy1q-dj-p x i is the impedance at x-p--qc -,eddh7kskpyi8hcj: 1v u/ f1000 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 2b2sz,t7 ksqr1q,uw ( d0-mH inductor, what is the phase angle at1d,,sbszq r(w2u7kq t 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 circuci , y6pp:f b8:nnbtqhg,5ai9it with a 20-mH coil and 1.0-mF capacitor for a total impeda9,nhp if i:gp5, a6ybcnt: q8bnce 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 followinu )w xmgnd2a5sk n1ktdg6j 20s87/famg capacitances is needed in series with a 100-W resistor andnds)72ag s156 0kx2jgnfmu dw/ kta8m 15-mH coil to get 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 450-mH inductor at 5000 Hz h :fm+c12eczuma15i u,7l( ;urlslns for a total impedance o zin(mrs5 c 17 u+s,ml21lcuh;ea:luff 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a/h u;ror8 ,wr4pb0 lq,1f qkvr total impedance fo,h4/ ;k8 wrl,q0bvprqur1 rof 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 capaco8,m-c8xuo3lgv: 2x b zinb 5zitor. What is the impedance at 1000 Hzbx z2imgz 8lu -xo35,bovc:n8?

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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 yd,p6 ,pvn(n bfor a total impedance of 45 W?dpv n bp,6(n,y

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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 1.0 kHz for a 9(jufffc 63 n+hhh)bwphase a(c 9 f+jhf f63hw)uhnbngle 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 serm h*oy+tzu;mf ;jzt-q 5c: kq/ies with a 30-W resistor at 1.0 kHz for a total impedance :yq tuc*f5z jmoztk;-/hm; +q 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 capac0oy3ny0+mqju z 4; csynioca8l17 2zs itor at 120 Hz. What is the phas8cin lzom+yn ysy ;ua40 31c207o jqzse 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 resistorr d/zpww+fkc tvy z5c*nan ;3)8r/x7i, 20-mH coil, and 1.0-mF capacitor are connex+;crtaf 7n5zvy *p)8rc // nkiwdwz 3cted 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 re:s e .wctil,l:sistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is s:tlci.w , e:lthe 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, - *jhk-i ymfs.5nwne0fi)h5 i and an inductor of inductive reactance 30 W are conn*)fw.5f hi nm -s-i nye5ijkh0ected 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 resistor, a9x68orb4ly mm kj wz 4ue6tt7d2v.-g s 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?v2j-z67 sulk 8togdrmxywe4m .694tb

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase an3 wm+li;2oa.izjf/yk gle of ;wozf+am2 yl. ii/k3j$40^{\circ}$ 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 r 0:v s:jmgirpv0kd6. p30v xd= 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivindjgrir0v dv k:0.v x3p6m0s:pg 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, 15.0 /6kcnc.+nh m4nk8b ntby)cn *W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12 .nb8b mkn hn+)c*tcckynn6/40-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 AC9 54a)waaw70kmpmj nk circuit 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 resista s.*zvex/rxy21p5(muaol;s wnce of 30 W. What is the power factwe o xzasr.lmy1(/* ups ;2v5xor?

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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 RLqsx: az0ppc7 i+ri;m 1C circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connec qx;+1a miizsp0rpc :7ted 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 cap5vx5vrw1vm9owu2 ko 8 acitor and a 15-mH coil in series?8ko2 5 ormvux 915wwvv

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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 md+kn5// gibr capacitor for a resonant frequency of 10 kHr/dbnm i+/g5k z?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is n*)zaahgue 4a))fc q -mu-dl3 ieeded in series with a 3.7-mH inductor for a resonant frequency of 1000 Hfglmuq- *4a)) -ieu azdac3)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 c(3nn0lx:yv k with a 30-W resistor and a 40-mH coil if the resoc(nxl v:3k0yn nant frequency of the circuit is to be 1000 Hz?

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