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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 mhmrd9brzl-w*yh,)) u8 jkp0 zagnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states)8 snl 8gaejzgv vdh10hg2 mk( tw.k.1 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 in a coil produces/f2wli hi1wriw1e, 9c what kind of change on th lwwe 2fri1c i9i,w1h/e 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 of the magnetic field through a loop of wire p7f8, u;gn8rw o8pag/a c5gp ngroduces what kind c8 nf;58/opa8au gg p,7gnwr gof change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire p0m josrz6.z:6ak-w8iu7aa a groduces what kind of change on the induceda67zr0oza6gaiau :jsm8 .kw - $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an9(c y lusu1 czci9a2c0 $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in vk(5k pnn cg dt::jc,mp6) ug bmbn56;a conductor will be that w6tm:gnuk :n ( ; c6)k5cjb5bdnv,pp gmhich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A barywar azei83p 5+i:pt- magnet is held above its center with its north pole pointing down. The stationary magnet i 8i5z+e-y ri 3tpwa:apnduces (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 ta85cz g1:5lut-h;) ww qk, 4k asvatmtsble. A bar magnet is held above its center with its north pole ptcwg;wa8 4)tzhk-u k5m, s q:s1lat v5ointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a renybs8hi jw6pm 2 6,2ifgion where the magnetic field vector points straight up.wi8,p 6b jfysh6i2m 2n 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 top in a region where the magnetic fie g:4quonqj4 :l( ru)gtld vector points straight up. The magnetic field sudg:4gjun(r lq4 u qto:)denly 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 horizontal table top in a region where the magr wutf-as)x) yx/cl4 - 6izr*gnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this co i)r fszt/g -x *cy-lw4)ura6xil 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 twe+uj ;sep6h +able and carries an ever-increasing current northwarej u6he; wps++d. Two coils of wire lie 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 throughop9k5u7i7b;)hfyd9duur sq 5 a loop of wire with the north pole entering first. As the north pole enters the wire, the iksruqf up9)oy;h 7 d 75id95bunduced 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 spe *bu6a/k zq.bgv w/8gqed about an axis whose direction can be varied. In a region where a uniform magnetia b/uqgg. b8v*k /zwq6c field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular s2w) qy(xo5i ysz nbv q2w hz2*5n6llg)peed about an axis whose direction can be varied. In a region wherqo)*n wn2q sgwz25ix6l52 y vyblh) (ze 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 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.1vkjpdp.j z 70 j-f.dbw +mkk;
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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 th pm jw/ yo79eso*o*;gm gog5h0at 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. The 1cm)cvw4q;zn78u sww $emf$ 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 (orikscq 8yc qo47 g,d5x7iented in 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 acr4s5i7k 7c8dx g,yqoc qoss 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 velocitl ,;bx p84zclji3j-mvy $\omega$ 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 tra)v jp2 gtv6dp06*f/istm1 dzyl (esp3nsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frww v;v meg/j+klu p,,5equency of t/jwplw,ve ,;k5mu g+ vhe $emf$ 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 devick go*k sn(7d yi8ed.o+e 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 thag5 yv75ylbt4 hq ic:w7t

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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 coo37tp:0bm69 j/uc8xenj t skpil contains more loops than the primary coil then imjk pt96s7:o0t pcju3 x/b8 ent 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 mb qmtdzg:p*82ore loops than the secondary coil then it is * b2:pmzqgt8da

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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 2j lo amh4.iw/qa:f4opower 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 circuis - a( ,;yns skx84j2t*gpjcret,

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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 battery of conf+03/l/ 6uffvvxv 3l prec9ghstant terminal voltage. At the moment contact is fp9 l 6+vc0f3gf v3rx/e/vluh 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 i.tt3x,fir ,h;ud vjw5deal battery of constant terminhtv wjfti,dr35 x.;u,al 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 resistance R7bk9ot:+h ny ,et cpa,y .k)ow.nwo; z 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 inbtimtnn6r *f(y .w iz+ek, *0qductance 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 connected in serivgulw.yv 3 q)( ,qsdhkxxomh/ ep- -,8es to a battery. The time constant for the circuit represents the tiv-8u/sykmw- lohd,qe, h3v. g(qpxx )me 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 inductor6s;x :g pf3g7kvz5mof are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit reprevf3o7x6f ; ggk5sp:m zsents 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 units etke9p,5*1 5kqdks4zac:gsb q 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 AChpdp)v8wpw;( b r 4ml6 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 hqy8bvn1 he/)j4j t /pcircuit, the currentj1/v yej 8 tbh/hpn)4q

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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 chang xv9oi3i,a :in -nfyy8es by what factor when the frequency is t y ai:3,nyivox9-8nifripled?

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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(hfvbq+7ja 9i np5.s9zzws( r is doubled, the inductive rea59 fv p+as7r9 .( bqnwzzihjs(ctance 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 fchx/5 j b*0 (y*9rk4ketob7zfk a2blthe AC voltage across an inductor approaches zero, the inductik7*0 2e /krjotcyhzl9bb kxaf(b4*f5ve reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to a -grww64 o vl4yhh(b:jn AC power supply. In this circuit, the currentl6(j4rb4 :ohygw-vw h

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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 5va eogmub1,9when the frequency 9e ua,bmo51gv is 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 zero, thtwhvus5fno k,;oq) 7*8imhd( e capacitive reactance of th md(shk )ou,v57on*iqwf t 8;hat 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 thet(mtpv/ wt)9x inductor and capacitor in a Rt9/wt) vpt(mx LC 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 c6.j3u:9bcs 9h coe krvircuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of te ze8n+zac.3b e bi. rjwz52x+he circuit increases if R increases. aewje3 b8nceb+ 5+2.. irxzzz 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 cir 7y) 86; zzdidku-3q*xgyzkmj cuit 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 incr5r a7m ncjeh::k1 4iqleases 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 circuit, th;82.2cqz4dt /raox2cvxju t qe resonant frequency of thccautr2j zv;d2 xqt.qx2/4 o 8at 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 tm8e /vz3lc m-f2 dxcl1hat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC cir.me1k8dj+y p3 a,nwcjjz9 4lecuit 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 rotati) wknrh 50 dm41sbeq.ong in a uniform magnetic field of 0.20 T. Find the magnsqe)k4bor h1 5d0nmw.etic flux through the loop 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 rotmmdig+ti.e2 6/x0wbaating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when .t mwi+ie/bm6xg02 a dthe 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 acb)mni 51 /v2xy om2ah(vy)pminv.o 9 uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wh cp21a9)5. yio/b vmv(nxyihmo 2 )vnmen 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 adjustb 2* g.vtqoajcmrpquiwg -dh: ( 2*p65able 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 chang1yhn- y vn3a/ces 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 20 qw* l5n.+*h kowf5qrz0 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicl.+ 5w*krqh5 fo*wz qnular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with :7xbx/o 8evyos9:gm v15 turns 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 and ard5xqq.r(+o x d1a1djpg8qa24 um hnu 1ea $0.20 \; m^{2}$ 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 w/uu(f7z0+s :g3 ya -g)xmiypzaaar5 wing span of 60 m flies horizontally at a location where the downward comp-ui5f x :gg0yp)3mza wy/saz( +aru7aonent 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/lw )45y,pxam(ica -ak *-ht)hshgxv/e-mkj .0 m long rotates at a constant angular velocity of 2.0 rad/s )xec)jk(m,hhpyt5 wvs gl-i *h4aka-/ xa -m/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-c:cohww ss*- 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 wiref/k ,m1vujs: s 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 -ewa9g/owud*ojs1z 7 rectangular loops 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 a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will bo- o ujswage7*9zwd/1 e 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 wireas8c ,i .ng mbi+ 5y-go-h6rkf 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 of 12 V djjsnl k:19i 6maximum when rotated at 60 Hz. k sjd691ji n:l A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum ,p2 kgkb4gm o,$emf$ 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 8q soxda949ixvp*8 tbntl54hoperates 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 motorntytp:i ,mjp48 7o (gt have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it gegyo8tp:ijpt nmt7( 4,nerates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powerk) xp wydm-k6nyz2 *r, supply. The operating current i w-zrkpy2,)nm xyd6 *ks 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 fnqwsa hh8b9*6o, c8l 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. sf,nlqoc 6 w9hb8*ah8What 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 24yomc/nncj5ugur(7t (/b+8m 0 vfcta6 -V power supply. The operat/g 7/c0r6 +cvtyubc(njm5 8an(fmu to ing current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltag6uv/bqb+ +1 fi jxj mxcnbz7)(e 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 flo6n+dplv 6z/7ohs8nhp mi u7 (gw in the secondary. How many turns are in the secog n7hs(6izpm+u l h7v8 po6dn/ndary?

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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 c enuyz:d322 5ges 7nj110-V primary if the 24-V secondary has 1ud y5gez n27e3j:c2sn00 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 primab0:eghokz4 ..gp:ev uk m 47rrry coil and a 2000-turn secondary coil. If the current in thezu ob:.k7k:erv44 g. 0 hmrgep secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effi;77:./pr gi pnuxxjz;r jy:g lciency, how many amps at 24 V ca ux7gzj r g;lp:j.i;yr/np:7xn flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7+sa) *. 0vt3:iqr(6dkcmas y9zpig3jisv 3ks500 V at 10.0 mA. The primary coil operates on 120 V. What does the spt63 vvk imkg+3sri c0(q)sj3*: z9s.day aiprimary 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 6/ pc4uhkh)vnon its secondary coil. If 120 V at )6/ kunv cp4hh2.0 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 turns on its primary coil and 300 ttqcpt qj6,u40t11a yg- j(mo.cd3 nqourns on its secondary qqn3ycogd,0 (p. jua mcjt6t4t o1-1q 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 its secondary has 200 mhb x-a3s. h,eturns. If the input currenha,.xm e-hb s3t at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a tra3e 2b8n (lljvqnsformer has 100 turns and its secondary has 200 turns. If the input voltage tov elqnj2 38bl( the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hask231 eh-v9fu gm d*9 fahgg7uw 200 turns. If the power input to them7fvgwd h1fkg -u9a 2ueh 9*3g primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped tax c3.;lku18h as2jhup to 4500 V by a transformer and transmitted through a power line of sak .alchj2hx;18t 3u 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 voltage is usually sr jbnv*)ifu9 .tepped up ) i 9f.u*vnrjbto 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 Vow3 ;g9uk9 hnkn/t -a3yys /mbtn9n 5y. 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 i an39sybnnygyt; 9/kwm35o 9/nuh-ktn the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generp3e:8 4bl xlcs 8it+sja(cr l,ator 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 lost if the transformer were not usej+4l bxa: s3,s ccprt8ei(l8ld?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A ge; ;ws+ bzoey0fnerator produces 100 V at 70 A. In order to reduce energy lfe w;0zs;y+booss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a bry atvuv/t0;q :7 n7ozhq.d5n6a7ok 6-W line at 1000 V. How much less power would be lost if theuztq n6rkb;v7 dova.7a5ny0o7q /t:h power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line w rm,x.u5/+ zjiif6 0q2w h5hoitmsd*oith resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not oh5i 2t.6/ *jur moxzsiw0q+i 5d,hfm to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is store4mbi3w u*brm 9se+l/sd in the coil+w ise u4mblsr9b 3/m*'s magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resqy8 .zb- .qvb2,y5jz laroox)istor and an 18-H inductor. What is this circuit's timej8l.oo aby-v.q) ybz5 rx2,zq 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 circs9 u1*5 o5qb5avb)fsc+lku b 9 vhs2irfr) bm5uit 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 yyqazzw0mf3kds8.l kc5fyi78vv6,8120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of m..r)m9mug6x6 q7vmzt c+tc jtka4h *the lamp hc96mgrmvjt+. uk6cq)t* at 7.zm m4x?

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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 aib)/i, 8+h.dyhdpky l 120-V ac power supply. What is the peak current ki8hy /dldybi. ), +hpthrough 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 ce,d n s5 8itwp11(ew .j:dduj4kqrju 8onnected to a 120-V ac power supply. What is the power dissipated n:e rd5t81 pwqei,4.(js jdw d juuk18in 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 k,y dop;mn13a a 50-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 a 50-W resistor w4x9kfpl gr,c080bbm58ex i ois $I = 0.80 \sin (240 t)$. 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 e6*i/b4nabm,cu382n ( rcdmlghen e 4$I = 0.80 \sin (240 t)$. 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 inductos a*o,w+y..lqgy os+2 fxfzd4 r 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 reac k.e ,)rzpg fjlu*)ri4tance 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 ;rh+gbib i5 +2rfut8 rv5n0he.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 necessaryyu0 rd +jogriy,( z)x.9j-zqm 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 sy4 l(p tg1ms5wgu19q frequency of 20 kHz is y95sq m4uwpg(s l1t1g applied 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 3-+ygm 4m3yg sah mr2sthrough 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 of a 4.7-mFvvb1iq()( vxg 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 u*uxva q - 5ubp:s(g(bcapacitive 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 oui/2c rge)3 gtf 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 bk6hmr)h hu(bvj;a a. 6e 100 W?u(ah ;k6jvh)b6.h m ar

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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 hi6z p2 .+hb +bdoou9o21vvyr5.0 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 se/lx8he 9zg/u tries circuit with 12.0 W resistance, 15.0 W inductive ul/g/9xt zh8e reactance, 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, 209r;k. g p xi;7hsld2gl-mH coil, and 1.0-;9pgkl s. ; xrhd2ig7lmF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if ps4 a1vly22dh ckk+:x ofg0g*a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connksy f h24d20gkvxgpc +* l:ao1ected 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 seridj1(w3)n:gxy b0mfseuu5 vs0 es with a 20-mH inductor, what is the impedance at 100wjemx :0dgv0s1)(b3u 5ny usf0 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is thconvr hw(zzi8-9wv3k,nd* k ( e phase angle at 1000 -vn8rw o *ik,ck((hzvzdnw 3 9Hz?

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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 act,xb **ln m(ond 1.0-mF capacitor for a total impedance co(blt* *,nmxof 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 l*.o77y7ta8; n k7pqwo gy obmis needed in series with a 100-W resistor and 15-mH coil tklnb7 .*7a; poot gw 78yy7oqmo 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 454i.r1c-kj3/an teeno0-mH inductor at 5000 Hz for a total impedance of 1 tja-o3r/ .e4cninek 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 pap:yumj n1u 22ut in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW ap1umj:un22y?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is tlgt)ft 9w:v) f6 yg n3s)v/f;zpbl5rbhe impedance at 100ty;3 f sb)/vbg59rfv ) nfw6:l gztlp)0 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 xdbejbvg8+f rh f8: ;710-mF capacitor at 1.0 kHz for a total imp8r gjvd;b7:hxfb 8ef +edance 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 witzva)ev( k-v(2e6 apmshjqxk6;+muw, t4y )e rh a 10-mF capacitor at 1.0 kHz for a phase angle of w) 2)kah6+k,- 4 (m6;vre qate(juvpmzyxvse$40^{\circ}$?

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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 muz- 9sa us(ci 3rw;q 5b,l lmbyach-:urm7.(1.0 kHz for a total i(yz3ss a,.:iblc h-mu a uwr 9(5c;-brlumq 7mmpedance 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 witi dlvdgf, 1m79k,fl04e yp; qgh a 100-mF capacitor at 120 Hz. What is the phase angle1fypk,,eidl 7 v4df0gg9q; ml?

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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 resistortkz68 k f)f8fa, 20-mH coil, and 1.0-mF capacitor are connected i )fktafz8f8k6 n 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 odoue vjgle:s2(swjf. r3p3q 2w273 be f a 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. 3l d .7b 2vwfespuj 22wsr(jeq :geo33What 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 oe mvg6d9ml 3 +o ,izc3zjp7-hsf capacitive reactance 30 W, and an inductor of ind dl6emo z39j+m3-p,hs7ivgcz uctive reactance 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 resistor96f ue:wegmsc , fplh-.3ly:i , a 10-mF ca pemc6 ul.wghe:-s3l :,f9yifpacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in sedsxgjfsb 21- g.3j vx/ries with a 500-W resistor for a phase angle ofx1g2 .-j3j dsvx/gs bf $40^{\circ}$ 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 shkl45h0hf x3js//a m= 10.0 mF. At what frequency should the circuit be driven/lkhj50m 3h fas4h/ xs in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac s zrb(2jpzi+h5 eries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?jr5 h zpib2+(z

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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 ad816n cf+c ctbn AC 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 oftxwlh) j4iobi 4sstnz ri- -zq,38 58p 60 W and a resistance of 30 W. What is the power o,i8z5qs3js)r- wiitx4-zbhnpl4 t8factor?

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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 circui f9/nq gtfv+ i1v)wye/t containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup /1+nqwf9 tvfivy)/e gply?

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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 capacitor and a 15-m, 2()ph- g8.sbf1xad wgqylnfH coil in series? 2sffd bnx qgga,1w.p-( l)y8h

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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 ms8tshm2y80 d+dwv ( ofor a resonant frequency of 10 s0 v (do 2dw8m8hyts+mkHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is ne-wwl7 x2:awulk7k 5zsocj3:o eded in series with a 3.7-mH inductor for a resonant frequency o7s52kwul3wco:-: zx7o w ljak f 1000 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 series5ypndg1a9b :f with a 30-W resistor and a 40-mH coil if the fp9da1n g: 5byresonant frequency of the circuit is to be 1000 Hz?

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