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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 except)x ambhygx 8. /1-/ wh7mlkwto

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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 inductio6p+ nifunbqv8hw1 *e9k1c, 8hyx zy,wn 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 of wire in a coil produceu6. z1hy59sm j przg5 7kww1fvs what kind of change on the6 mz79wu.y 5jrhsgzkw vfp15 1 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 lobg uv gp*rb:*)cn--evop of wire produces what kind of change on the induce-)ubpg-c*r gv:vnbe* d $emf$, 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 wirxs*( 9s -bhpfze produces what kind of change on the induchb x*zfs -9p(sed $emf$, 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 m1rt;eq l:n4d:tfvrs 2agnetic 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, th5rn9-mnd7d4lb( u lwa o5hhh(e direction of an induced current in a conductor will be t dr(bo55n-h u97l md4hn(h alwhat which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontjub;los80 s mvx d+npm-5o 9,tal table. A bar magnet is held above its center witsoov5u-;8,9ml0+m p n bt jsxdh 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 barl jlagb)vlzj8 *0v1l / bd7c4p magnet is held above its center with its nortj 10lj*/ ldczvlvbp7l )bga84h pole pointing 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 tcyz6tab 49ms6/+x u1+jr:o.rz( 6wos ystvho able top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in thihs66aysz 1o+(osjvw : 6bmy/c.+z9utxt rr o4s 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 fv k ugn./8n2nkield vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directiok2/nvgk8.nun n 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 regionv7 n.wb*co) jfttj21u rs/hk8 where the magnetic field pt1svc oj/bhr .k8f2 )tnw *uj7oints straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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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 horizonta/sy ;1:*d.ri abo9 9zx ozxmtrl table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circle9ozrsz a.b o:19 * rtdi;myx/xs

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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 nm3fic:xnvh7 4n4 ),wq s3/tqohtf h 3entering first. As qi/ von3sxfm)34 3fth, chhq:nwtn47the north 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 a hz(xp062pc bjbout 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 axis of rotation(h6px c jz2b0p 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 angularko+mz o 51zx)jah9y8 r speed about an axis whose direction c)oa95+jr x1m zhok8zy an be varied. In a region 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 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.0rn(ke b rl0 dd31,ufz5 g+odx
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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 tha;br7(e h*k 2 pn(uipf.wrlp c3t 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. Thibrdjw oew+x6 au+8t.(p+ a7je $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction n2suzp:rke:w c/43lf) is moved northward at constant velocity through a magnetic field that pointsl:z2w 4k np3su:r/fc e straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates ato yqj9n8k s)np.7d4a 3b+qqeui 3ca 3p a 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 transfo z1t)z,0masa7* dykxxrms

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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 frequc/q:xajd 5 dcrk9 0l9xa (wo(uf5pi r*ency of td ar xcl 5(0k fcux(5j o9pird*a9/:qwhe $emf$ 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 i :;k:jmtzej3swmn.oy+:r )qused 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 device66l uf0pe 5v35 yy0m8 qi*icdv(sv2m /lb qeks that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if v licio0l *4g9/+qr zdx0e lj;the secondary coil contains more loops than the primary coil th0egviq4 l +dloxj r9/i;z0*l cen 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 loo6pkd-zz s lq;k56y 4k0hmymy2 ps than the secondary coilmh5l2sp kkk;qyd4-z y6m 6yz0 then 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 7j22vizyu,0kwpb ; xc 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 resonan:q7w g xqdr0;at circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inz5u1-8goe g7 f+ k/yuqptc: raductor are connected in series to an ideal battery of constant teaugo+c5ptkq18 fg :r yu/ ez-7rminal voltage. 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 dauv (6(qj+ kxz0 (bvyconnected in series to an ideal battery of constant terminal voltage. At the moment contackxbqa0j(u(vv+y dz6 (t 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 resista3feg/wkf l96;oz;l nt nce 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 resistance R is conn ;3tyd)i:e emkected 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 inasrv y:b94)0jvx e9voductor are connected in series to a battery. The time constant for the circ 9v:syv 0oxv49b)a jeruit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connm0 jkh:-8sk 72rllfu ay)ho 6:-2w1ccqmz o kkected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the tim q: kzu rjlk1al skh2cw0m8oc6h-f-m)7o:y k2 e 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 yfl*bg 2pja0z4: )os tszp28qunits 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. 60lyaultj0 p0tn.dg5 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 vbr6.c:5 6qbog :psjcthis circuit, the current::6cb bcrq. vs5poj6g

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when tlx m4 nb8x0gg6he frequencyl80xxnb4gg m6 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 across an indc.mz4.: ukkh wuctor is doubled, the inductive reactance of that kkm.z h:.cu4winductor

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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 approaches 2/y kev)uu 1gvzero, the inductive rea vg1k)uv/2 euyctance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In thismu,am9: yoe)s circuit, the currenoa,me9:) y must

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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 whenof4-iwcy k;6d:q rc7u the frequency is t oy64;w-kr:u fd7ciqc ripled?

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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 voltaej.f ruu17 f+dge across a capacitor approaches zero, the capacitive reactance d u+71fef r.juof 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 /0-ivj; k)jubltf3 iz 64( ibxqfxrs.n )4sidthe inductor and capacitor in a RLC seriz4tb )kd4)x qunvbi3/i;i(sjj0frlf .sx6-i es 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 RLg,g su1v o qguc1)5 0 t;3tu:gkvi5dubC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The/,6jhodr hl 2o impedance of the circuit increases if R increases. When iso/2dr h,6ohjl 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 imp ;2fcrbib0ol6h /8wv;j2pfht, h )vauedance 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 imped6s3 /t*pzzehg ance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doubd ypf3.0bgi2:gg pa :ele in an LRC series circuit, the resonagggf0pp.ae::by3 2 dint frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied volti)cu .yhrd i6bl4, f +4soktw5age. 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 circuit ofhl3y x l(45hcccurs 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 rota5lrpu kr: wxb9.w(cnk0y 4j5j ting in a uniform magnetic field of 0.20 T. k u95r:p cbw4wklr. j5(yxjn0 Find the magnetic 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 rotating in a uniform magneti r9eo8 -j9lk9em ,yubvc field of 0.20 T. Find the magnetic flux through the loop when t9e8ybme ru9kvol j,9 -he 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 unifor d( itj(lpm08rm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mjp0d tl8m((riagnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced f iwm(8e* 1ti peuy*ng0elt0 bjcl:oj8+t3 v x1rom $1.0 \; m^{2}$ 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 fr*-nz)glo(st pbcl9 y+om $4.0 \times 10^{-5} \; Wb$ 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 h2 ;hc3c2 c.c*iqdpcw18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If thec2h h;c ic*3.2wqcc dp 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;oznmx.e *oe/od * i.m 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 w f /f+k+mee-rarea $0.20 \; m^{2}$ 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 location where ia-im;o,-; fp4a 3lmhdon .7zjri8vdthe downward componendm vo7,;-iimpozldaf -3ni4r8hj a.;t of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates ac zt6erok2 b*npb,92i t a constant angular velocity of 2.0 rad/s about a vertical axis thrc 6* ipbo2r bze2tk,n9ough 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 50rrt:v2al ek16 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 p0ui) 5l,ej35hsrfq 61 qk srdarea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cewfh/hom98q+ m long and 8 cm wide. Thhq8 9wo mfe/+he 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 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 wirel xkniu8uil 9;y0tw(qna.j(1 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 wishto hksdl9 8-qj)x3ua 1 to construct a simple AC generator with an output of 12 V max1u3 8xq skdtohj a)-9limum when rotated at 60 Hz. 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 max5p,rohr qa mbx0 ak.;-imum $emf$ 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.ncala5ee 2:3 s 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 resisyleu -7tr.); nhq1 eoutance of 6.00 W. The motor operates on 120 V AC, and when running at full speed)u1;o7t r -eqyuhln. e 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 connected to a 24-V power supply. Thkv xw77-hyf7kw kqw, -e operati-7qkkw x whw7v,-k7fyng 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 to a 24-V power supply. Th-lpzue0**g8g h y7f ha)qg5tfm9k7 xge operuz8eg 50pgtflk)-a h f*x *gg7h my79qating current 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 v v0j ccayj(s./b.xg*connected to a 24-V power supply. Thexya*(jv.v c.sb j gc0/ operating 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 voltage o;yn (4gwykv:o4f2 oqc 0k .xqjf $120 \; V$ 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 causk, 7h0 uuv1ivem5o /tbes 14 A to flow in the secondary. How many turns are in the secondartk u7v, v h50/be1iomuy?

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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/a9okj0vr 4 m q /q4mr*pfs5aa if the 24-V secondary has 100 turns4armaq sk// p5f am90qrjv4o* ?

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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 l )r:+cus0k1;+ lukofk uear. 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current ikr1lke )kucoslr+;+:f au 0u.n 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. Assuminw46)3:b+ 5sn q bpw dtiutbcn6g 100% efficiency, ho3stq i6w)5bbtudpb+4 n6: cnww many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at ii uvmnt0 bxlb;oa pg+olqf o/1 5r v.-c0v9/(10.0 mA. The primary coil operates on 120 V. Wh(p mqoguvan5b9+f l00/-l1rivvtibo o ; cx/.at does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on (yc mt,zxa2p3its secondary coil.y(2,zx amtp c3 If 120 V at 2.0 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 turns kq*dy +fhkzepy8;9 (dy c6 h7pon its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondarepf y;(*d6 zk+yy87k9phchq dy?

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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 tl-kc* e6)vpqx ij-q t4 u9dj0ourns. If the input current at the primary is 100 A, we can expect the output current at the secondary to 9l q-jc6ki u v p)oxjt-*dq4e0be

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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 tran tr)5v kdqpgl;+ta qiou327/gsformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expe7u )tqktrglo;/i3d a2 v+qgp5ct 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 has 200;n ;a+ ,d d,o6fih7decqj,leu turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neahe ; ;d+qi,,cd6o j,f7leudnglecting 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 1205 vmh9f jwdn(4fba9 +s 3:mjvl V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistanc3vn9+5bdvjalhmjffw : 4 (ms9e 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 stepped 9bl3qil+t 0y eup 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 transmbly+ qet0l9 3iission 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 steppez3 x+38, h h)xyb lcrx8wqh-v9dmgtriv*qx;,d up to 4500 V by a transformer and transmitted through a power line ofwhqr x*8,gymhvx8-x; vcqx9i,+3 3lbtzhr )d total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a tot+c qa:* yl drn9,xkll7al 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 lost if the transformer lxaq7+,rlk *nl yd c:9were 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 ah8j(-w qt8vc9 0q.cs lp0nv299mt h r- fqoaen total resistance of 0.60 W. A generatj.hnt-fqmqa8 0ce 9p qln c89wt(h-2r0vo9s v or produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the 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 0l hhi:2l errp(x+t c;V. How much less power would be lost if the power were transmitted at 3000 V instead of at 10erp itl(chhl0rx+; :200 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 i,w:8u2 u,uz g l,bzgql(3jzt ys 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 the power loss in transmission is not to exceed 0.010(:zgl2bj,, ,8lquug z zty3u w% 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 storerdith* xs8d4b5- c-ood in the coil's magnetic fieldo*ohrbi s-d c8 x5dt-4?

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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 /gi2vrt,(sn z a 6.0-W resistor and an 18-H inductor. What is this circuit's time consta(nsr2/gv, zt int?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where 49mg;q ls31e h o2 m4(haxinvxthe 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 in;.hql,rv zoir cql*r k/*o4: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 the resi.jwqinpi,9/p-gefhy5l (dh 3p 5t0vn stance of the lamh-lfw5n953d,g(p/ pyji pie.hq0 t vn p?

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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*vqplu:dyq wz/ 5b40v supply. What is the peak current through th*ydpqvq/5lvz :4ub0w e 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 aqdu0de0uq(+tm o cjn2ee (a0) 120-V ac power supply. What is the power dissipated in the rd0 (( ) e+aqo00nuucjeq te2dmesistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W res(fxx o* r9rn6qc 9qsdf7hl5)ristor 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 resi62 0 u*jlwssmcstor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is 65k-coxixodr*qfm k 56:msxc0p: xn 8 $I = 0.80 \sin (240 t)$. 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 o wrx skpvx;in/w/pk;798.je yf a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance offu/,uk*9n1hwq iqr: s 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 akcxbn5 7 5afh+ ,fni(c 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive rmml -d4ytv 24heactance 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 frequenk+ xit/:fru5oc)abom.6 ag f+6mg yn.cy of 20 kHz is applied to itcmg.m+n x: k f.aar)og6fyi5 t+ou 6/b?

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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 Hz,a* *2p p8gtmgpqn5 xe 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-mF capacitor at lrn3gn z-+:o rr+z 7o jkck0u110 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 capacsiohm bg 0f5.9itive 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 120upbc6l2f20j x 0 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 capacitsgj7l 0cwp7w0 sm24inor be 100 W?sinm7 wl g 47cj0ps20w

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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 ana0erl )xnr n -l-n(ikg)*v6dnd 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 2/ v . *n-qnuqpc.ojbxof an ac series circuit with 12.0 W resistance, 15.0 W inductive reacta*jp2c vq.quo.bx-n n/ nce, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20- sj4y,:rqr0g bet d+ gs282qnxmH coil, and 1.0-mF capacitor are connected x4 nrg8,2 sq:+gqs e0jrytb2din 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 1500i 3iw0vx6lcb5j,xd c ( Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ini 3bc ix(j,dwx 6clv05 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 wi jobxh+/+:xgrth a 20-mH inductor, what is the impedance at 1000 Hzj:b+x/ xr hog+?

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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 connew su7llfxul mh43+3. qcted in series with a 20-mH inductor, what is the phasu3+hl 7lxf3mu.q 4l wse angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capn ,t8i 5pr7ypoacitor for a total impedance of 100 W at 150 yp,t 7prin8o50 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 capacitancu 7saq;g f.4cces is needed in series with a 100-W resistor and 15-mH coil to get a c4caus.7gf; qtotal 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 atzde 3+8w. v ,7uk)the5ezp6cwaf lm4i 5000 Hz for a total impedance of 40000 zw ezi.3aepvme+7c) 56d4k 8hfu,wtl 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 ,lsfm u du ye7(+3 0sdb7.ptirfor a total impedance of 1 dfi,t07 dumr7ss(ul e3+ .pyb50 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 capacitor.1t8 w cfy6u( ye2z6jjti+czm5 What is the impedance at 10 mwe1 t zji5fy6c(8tcz+6jyu200 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 capaa+ y w/(wwlt.j*di 6vrcitor at 1.0 kHz for a total impedance of 45 W?t. d v( yw6+rj/wawli*

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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 capacitorpgnu9,e z-2a6 o(ol 1 ,kokqij at 1.0 kHz for a phase angle jn19-(ak 2lk zpe ,oo,uiqo6g of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30- g 1p5e(p1unctj n197bp8mnlyW resistor at 1.0 kHz for a total impedance9y1upbe npnj7g c 1 (p1lnt58m of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120t8s xdwktgvp;((a ygo )0t(y/ Hz. What is the phatag) (p(st /0kvdyy8 (tgwx o;se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, anrkf8(z/3s ,gas3lpix eh jz- 7d 1.0-mF cap7pg3 hj/esz a8- z ks3x(,rilfacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, ai:n;lh ttqs-e 0 9xu-q 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the lstin 9qqu- h :0xe;t-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 a3xl9m+ut7j, f1rgpr of capacitive reactance 30 W, and an inductor ot3 + 7alg jrrf9xu,m1pf inductive 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 containin . clu* gf/35jc+ h4ekcao/rxfg a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne+l ek3 xc 4fc *hu.5/rg/oacjfcted 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 nech .5m2 s84m ;/owbnclwhyaqsvj 1,wz/essary in series with a 500-W resistor for a phase angle of c a8vw;bw 2 1hsz 4myq/o jl/sn5h.w,m$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequencysye xnu-j.;rl.ya(ze 1d -3(vuo4p bp should the circuit be driven in order to have maxi. 3olbjpe d-u;z4-u evxyp1 (snyra(.mum 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 series circuit with 12.0 W resistanctl9:pzndsqn 126 ( lo4vrhd3t egh 2n/e, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powl t/6s phd en:2 (l2g19odvq z4nntrh3er 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 a+/wvgvs1q-xuj4)sa b n 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 of 60 W and a resistance of 30 W. What isj)sj( *z;hv qd the power factzv;()s* q jdhjor?

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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 circ/d t+f a1fh9y7hxpn.fze3y/ g uit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pyhgn 3z/9+ /yeffpx1.ht d 7afower 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 fv/2))j;brskba i otjq gr8 f3jl4/hf. requency of a 1.0-mF capacitor and a 15-mH coil in series?gv b kr.sa)b rfflq2/;/j8 )i3hj 4ojt

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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 cap/1ytslr: 3ecg:mhtj ; acitor for a resonant frequency of g1 mt::3ehlr;yt/ sjc10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with l2nx2 o;is9 3kp(k3lwkgm4dv 3 eyp d(a 3.7-mH inductor for a resonant frequency of 1000 Hz?k43pd2 dgyenl vk( 3 pw(slom93xk ;2i

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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 423wu0; xf n8miu;;bkzg nmw0p 0-mH coil if the resonant frequency of the2; m0kfux0 8 gz;n 3w;buinpmw circuit is to be 1000 Hz?

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