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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: 游客未登录  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 excei //1qcx30dqqk smic )pt

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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 inductsct4uh a,im(5 - n3ouq+d) upiion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops b.ext( akedky-t/wc0:zy0d :soyu + 1of wire in a coil produces what kind of change on the w +a-0yey (bk.tsxdcy/ 1to:ed0zu:k induced $emf$, 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 ofaz xy -ha/9 )dhl-yy4)2 cklap the magnetic field through a loop of wire produces what kind of change on the inlah d y)- 9la/ya)cpx42hy-kzduced $emf$, 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 ozxaa,j h715sq)a f/i xn the inducexif aa/7zj5a )xh1sq,d $emf$, 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 ftnez 9j-g 7sns7iicb6qj 6g19rom 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 directi 80 mdzpzct+0zon of an induced current in a conductor will be that which tends to m0cpd0t8z+zz produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above it9ght 0 rl*tv*f,osk*l s center with its north pole pointing down. The stationary magne,*t*khg v9to*r0f lls t 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 , rkx,wu*bwk g 3.kqzu)(jg*y held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed f* jw,r.gyw ub,3)zu gxkkqk(*rom above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region i i ,7bw-lh0 hp.rxgf(where the magnetic field vector points straighp(wxr. , ibfhl0- h7git up. The magnetic field vanishes 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 qze)v6*+q3bwlk5*d zbl kg cy .)kr1itop in a region where the magnetic field vector points straight up. The magnetic field suddenly grows strongerwkk))zcrv56.e* 1ib b3qd ylk*gz l+q. 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 top in a region where the magnethdmwmm5 12:k ( fv0 ,9lfnztlzrkc9k)ic 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 fie:z kzlkn9ktm2lv9 0)mh 1m,f 5fwc(drld disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and car2fg7 zb a( m0)s zchoqm:*ax5fries an ever-increasing current northward. Two coils of wire lie flat on the table, one o)moxh7b*s(g qfz2af a0cz5 m: n 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 pole emv 5xi1ro/6cdntering first. As the north pole enters the wire, rv6 /oci dx15mthe 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 about an axis wst5/ez nllgfjk3vln84t/ /7 zhose direction can be varied. In a regisetkf l 5ztnl 438nz// vlg/7jon where 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 wirg eg08qf/ z:35eg cconstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's :zg ecr3 g5iq0/feg 8waxis 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.8a:q mrs tc.wqgz 7-j)
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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 anu kmhb) fjt-a w/(;5vp $emf$ 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 magnetictce66g crdajqd a3)-mbd 2-:o 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 directilb be3oxd)d6n1 ol9b ;on) is moved northward at constant velocity through a magnetic field that points straight down. Make nl ox3l6dbdbo19; be)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 nmpbp xmblr,981 412qahx *9 eu8omjga constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transt 1m(+guzhk 5v+/y(z k-ebun nbh- i,gforms

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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 revolutionsi2z6nh 8o d-iq0c 7fpk each second. The frequency of tnfcd-izko8pq 26h0i7 he $emf$ 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 tgjc9 d305ctd 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 device thamvzm1hws)-qz z36p(pt

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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 t +m)mx*kqmp1rhan the primary coilqmkmxrp )m1*+ 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 primary coil contains more loopsp+twm(-l iz1r than the secondary coil then tr+ z1wp-l(im 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, th)r)n)8nv +wn p bwnwy5e power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ci eoub0ipkk.i(wr x4y:5lv7: lrcuit,

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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 sesy 95px 1lp/0iil fz+kries to an ideal battery of constant terminal voltage. At the moment contaxl5 zpil+f10p/i9 s ykct 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 to6ygc i3 u0*obv an ideal battery of constant terminal voltage. At the moment contact is made with the ui6 cgyb* v03obattery, 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 indu9wh-d d2hrp* wctance 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 resistv *3koxk9(dpml(pw8rp bg.5wra9-g xance 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 ij2-laumh2 z k*n series to a battery. The time constant for the circuit represents the timelkaj2hum*2 -z 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 arepg,vc y897o/ guvm5 lz connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to yvgp/ u8gz,9 cl mov75decrease 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 units e ;w 2m(iyugyomp;l:d :xcept:

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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 ya p(, w b(pptf*l3ko(AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curr,z(y *n 7bl5xdfm-qkbent x7nkylbfqz -5,m*( db

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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 atb5,()xb x(pbqn (da0b y .abac circuit changes by what factor when the frequency is (b a d.b(5bqaa 0b(tb)np,x yxtripled?

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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 doubled, the wg oib/d*x pbgvwe8)-8 gb .-binductive reactance of that inductor ogwv) g.*--p8g b8i bewdbb/x

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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 approachf r)/mda(z2)m9j( i:owfr9w rcrj w +qes zero, the inductive reactance of that co fr r9jariw 9qjdr( :cwf)oz/m+)(mw2il

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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 l ;-9ut1,i-p zp jtiqcr)nin,9h7fjsAC power supply. In this circuit, the currenj7i9ts fcp-j ,n tz-q i;l,ihnrp) 9u1t

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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 chang 75jp xfhec)+zes by what factor when the frequency i +fe)jx cpzh57s 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 acrox2i e*f1ty8t.e th6kzss a capacitor approaches zero, the capacitt1ehf2ytk68 i*.e xzt ive 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 indrjs4d 10 6v7oasyzj1 iuctor and capacitor in a RLods1 sj 1r a04v6j7izyC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is qzc(wgqt 7n ump7, d r;,3l8tqdefined 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. Thez 3e-hj )e:arr ,7 zr-zyez*gl impedance of the circuit increases if R increases. When is this statemj*ez ez7zrrl: e argy3-z-,) hent 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. l svb r6w-+5(xkw9 jyu 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 the circuit increases if ;rtf;;ejiz 9p4pk ( gl$X_C$ 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 LR k 6)ffl,5rakjC series circuit, the resonant frk,kf)6 rl5afjequency 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. Atlx9ie(qyqise9 / 4vh3 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 circui20yfcc+w /;auii ylq/ t 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 rotat8 m3pt3t2 5e ;ynocqdsing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thee 332qmty ;d8c 5nsotp 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 radiusii.49ix)ybdm ys03ju 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux ths.0 y9diyxium)ib3 4 jrough 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 a uniform magnetic fi;kg(3gm8s piph 0q7tgeld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an kig(m t0h7psq3p ;gg8angle 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 jajz;mhg g ,r7rt/ 2u*lsl*)f 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 cte+ 9w(le3/e ogp/yvdk 4x:mchanges 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 with sides 18 cm. A 8hcdgy.zbz z4i rk-.+ uniform magnetic field is applied perpendicular to thz- ckz8. yidz+.4gbr he 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 turns and an area / uhixko0(3h qof $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area mc79. 4y yzags$0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontal x3xmz06r + qoiheo2z.ly at a location where the downward component of the Earth's mhrx 3xozomezqi 02 +6.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 long rj2nj8 fkvqhb6nmlrxs2l.c);b )g a2 /otates at a constant angular velocity of 2.0 rad/s about a vaj.j )) 28/f knbcrx 6mgbhl2l;n2sqvertical 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 +2a sun iq q4l(bjex3950 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ar jmq0eskv5(n p2(l,mrea $0.090 \; m^{2}$ 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 loocwk j8e+vtm5 sy r9/- 7tm+cpxps on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in m t5v8mcsp7t+/9j x+y kw -ecra 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 1o (fswk/7 )nn ;vr6ljv*smf v700 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 genvyse at*:+j (verator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rota:y*te vv+saj( ting coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximu ,1; cw;(q j6iqlopoo5dnia: nxyz* r-m $emf$ 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 6.00j ftunulk clny:,a j02.u,.6u+fuhr0 W. The motor operates 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 resijo 5/fyq4i,ve ;5,blaafb2 r:0wuul tstance of 6.00 W. The motor operates on 120 V AC, and when runninaf;,lua:vil 2y/ ur4 t ,bef5q0bowj5g 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 connectez7p e:(y* f0hhx6kk1ms9uucpd to a 24-V power supply. The op x0 9f*ysc1muhh u6(zkek p7:perating 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 resistan,hvy.h83 fe3b,tk km tce 6.0 W is connected to a 24-V power supply. The operating cy3ht ,.8 ,vt3em fkhkburrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply(dh4rj3p 7wg (ue*ek d. The operating current is 1.0 A at full speed. What is the b 7 *rue dep4((jhwg3dkack $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage slif27sgk/p1u r ;mn3 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 transfq/ e1xznr*:a +zb lwgi6.d:jf ormer causes 14 A to flow in the secondary. How many turns are izdj*n e :ar6bqw+/li1:.zxg fn 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 o5(ni o ;i7 2cvtex4k,y htvn:in a 110-V primary if the 24-V secondkvnt; yito ,oc7xhn5(i2:ev4 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 c2dp.wt xxi :/2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current itx.2/cxw i:p dn 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 i c7cs64ify :zjn the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondarj 6csc7:4yf izy?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Thc+)f xwq,no n5fba y/9e primary coil operates )oa bnxfy5qf+9/c,w n 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 60ak +,k.abd):ohxy qi6 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A bx.kqaid) h:y6ok,a+ is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60)p tiwmc q-jrlqu2r(;8* c g.y turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pi ct wlp*yc -ujr8rmqqg();. 2rimary, 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 secondary has 20 y4m*y33e mi1bogd2vf 0 turns. If the input current at the primary*m2y3dgybm3 1fov ie4 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 haz.yp *(cty,iks 200 turns. If the input voltage to the primary is 100 V, wkity,.c(pzy* e can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and itsm)qj7v(-f9rv qv empccg6g6;m f7 9is secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary jiqmp)sv 7v7( ggrm qvcme9ff9c6; 6-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 ,e kfpyl8nc./ stepped up to 4500 V y,.8ekpn/ lfc by a transformer 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 ayj +ni rze78)g8rmv b6t 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in)+jn ib6rrv8z 8y e7gm 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 s9dwdy53 tdpso - n2sy*rr ;r6dtepped 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 transmis -oy sdyd69pdw*2rr;d3 5tnrssion 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 lon31 co5yiq3jsl g has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be loo1j lyscq3i3 5st 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 tot rx;1u9lp 9x m8kgjco,0 mi)btal 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. What percentage of the ox u,89p)m 0tijlk91 rg; xcobmriginal 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. r vqs1b nc3 4ql(-/tas How much less power would be lost if the power were trrl 4q-(/aqv13t nssbcansmitted 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 be transmivm*vq1(l6mov) g wv6r tted on a line with resistance of 0.60 W. To what voltage must the generator output be vl* )g61(mr ovw6qvmvstepped 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 o f okvodn6:g-6f 5.0 A. How much energy is stored in the coil's magnetic field?dkv6f on:6g -o

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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 cgq5i+x iri.pf1 )-iu5sh)dj resistor and an 18-H inductor. What is this ci+ r- h5ii iud)c)ps1qxj.fg5ircuit'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 volta-sb (z enh4rn0ge in an AC 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 ou v. su7zme;)2 pqb)nxxtlet. 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 i vykfa:a+- :qvazo3-a2ru sc-s the resistance of the la- u c2-::fa3v+vorz ak -aqsyamp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What i4xfs3d-:)b/dm by;w f* ramhvs the peak current through4m;ma bb:/d 3x s)yhwrvf-df * the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whuyaw1 +m,czx3kn 7u 1zn-ri+ sat is the power diss cyw-1u+1zar+ zi,3kmxsn u 7nipated 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 dw;g+ y1rnw-at3s/l z50-W 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 r58o h q)ana9ia 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resi9;id kk-0prtbfq4 ec/stor 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 1.0c:27ydni( .6 c+etzrekc m2hw-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH cqja8 o8pkp09 loil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactanab9ak8dyl / yq.-ly)0fz s*epce?

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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 mu s5yp eie776c+ x(cjreactance 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 av(u,j+ws5ho m8ti vy*z)pa v1 frequency of 20 kHz is appo siz pw,5uaj(tmy 1v v+*)hv8lied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hw2t hy d,ashm*+t p 8ek7)po*gz 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 nj36:0oejxu).b2 em7gn hpidreactance 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 capak,nba.3blsd: cy+ (:8kf vda;n )qc pfcitive 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-mca k0 q3sgo2u:ks7f4 gF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor :o;pn n9u,ham5;:i9urix zyqbe 100 W?iz ;ip;,q::uuo9y5rx n 9amnh

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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 07e4fn( cq.-t w.m:c/nakahj w.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuih;xlxcc2z5 x r c+rd7t*4 pc5lt with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivel;5c*25+h4 cd7 c xrtxzpx crl 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 (h9;i9,fsq3ssgu5(4u ikagh8iiuz t 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar3ag(s;iht5 ig 4 sihu9iuu,k8qs 9z(f e 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 if a 100-W resistor, 20-mH coil, and 1.0-mF ,19-u p7jxu g,bd/uqfhwy7 if capacitorf/ ugf7xu, iybhq-wp,9d71 ju 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 connec:d: qs c* a)5(oiexpgqted in series with a 20-mH inductor, what is the impedadq5)pciqoag * (:exs:nce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mHl+p 43za9uq4v1 mzob z inductor, what is the phase angle at 1000 Hzmoluqzb zva1p434 9 z+?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0- o+o20(hq( yn2gz.juwfy, a pfmF capacitor for a total imywo 2g,u. a(zp+f02ny(hq o fjpedance 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 capacp 5zfex+.nduh5-z fo,itances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz? dxnp o5 f-.hu+,z5ezf

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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 stm,+bt *s7qoj eries with a 450-mH inductor at 5000 Hz for a total impedm,ts7+t obqj* ance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a t*vdaq u.v:)qry *xe8sota*e: s*xu.yqdr8v)q val impedance 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 connectedlqi x1tre:ow4 4uh6k* in series with a 20-mF capacitor. What is the impedance at 14*kr iwxu o:146lethq000 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 capag: f/ja0) mc4q3t wviscitor at 1.0 kHz for a total impedance ofwac3vs qtm) /i0g:jf4 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 capacitqu+1 a7 ifzj/bor at 1.0 kHz for a phase angle o 1ub7iaz /qj+ff $40^{\circ}$?

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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(hs 4;61r zvhq4 o urkqja:*x ggs/y8s 30-W resistor at 1.0 kHz for a total impedance of 4(a/qzg8ohsqkh g4x v: yr; r*4s1 jus65 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 axei3ld4.i97 l*om wk gt 120 Hz. What is the phasmx. i3* 4io7lgewl9kde 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 rs)-xqql kp)9V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-m -sqq)rp)9lx kF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of j hqi+ 19/o h6(voxdtga 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is / hi 6+o1v9t hdx(qjogthe 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 capacito.dw(f2h0 0bh ume wtw2r of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-2h0 t0 ( dhubew.fww2mV, 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 seriu,xm,m /xdb/e es RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supumdx/e /,b mx,ply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle ob,yg*1yz)4 an5bhoty f1t y o4gb *,n5yhzy)ab $40^{\circ}$ 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 m jlfs0mx(/t4wr2a vh ,(6ocy has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tra4to2v(hl6wa xcmf0,mr / ( sjynsferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 Wv)6nzi5t jhu, hc w4l4ern.(t inductive ).hnt65,u4 lj (4twv enhzrcireactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit isul- cshi. ri(0pmad14 $63^{\circ}$. 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 1c-k b.+0v8ajc8v a ikg :lu( r(gvlclresistance of 30 W. What is the power facto.llkuj1gl(:cvb (-+0vgac 8i v 8rkacr?

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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 containinbr ,m-*u yk ;t ag2v(mzd8piz2g a 50-W resistor, a 10-8,2( 2u zmg -dpim*yatrk v;bzmF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency a e a8 4wq6pw *j/ckfkq8dys5l0a4tl3ihi(r8of a 1.0-mF capacitor and a 15-mH coil in series?(l83a/w kyi*4ca rlq56j0fep8 a8kdh qwit 4s

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant fr4)z ob ns/5exvequency of 1b)voz4n/e x5s0 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 new b.;wr4h jm:beded in series with a 3.7-mH inductor for a resonant frequency of 1. w4bb :;jwmhr000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-p**2uuv;w ( 9l9cr p;mcjn mdcmH coil if the resonant frequency of tuu*;m9n*9c m;cv d(rp2wpc l jhe circuit is to be 1000 Hz?

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