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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 v7 e/oo38zhgirj84icflux 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 statt6)gkgm8 m n)amos7c /q6 hxy-es 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 what /ie cqqzn9ge5u(88g,1h gb5 qfkot 3gkind of change on th qg8bfcg (ge5thko153 eq8 nqz ,gui9/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 oe ed04dhh0u f3ce q+,;pb*lce f wire produces what kind of change on e,30f+hd4b u cql dhcepe;*e0the 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 produces what kind of change on the indt*-kxj , hossxuw,17x ucedxx -k,w,sjh*u7 1tosx $emf$, 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 mag0)oj ;ruaam +vnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an inducenwdn r6 88 di-6u5cswnd current in a conductor will be that which tends to produc rswin 8un65ndd 8w6-ce 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 taa:mbmuie(,y9h g x.fr0(u, pk l5hzy4ble. A bar magnet is held above its center with its north pole pointing down. Tym lbirxhfy h(am gu 0pkz,5,49:u( e.he stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ab+6s b a5qv c91a;xuufq jv49xiove its center with its north pole pointing dowfb+xv9a6xicu5qa;j4 uqs v9 1 n, 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 l qcc ewh4nu411r5r1k 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 5lcwq rnk411uc1 er4hcurrent 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 8 a;b iwc6bh8:w/vhab/aaq doo:on+ .top in a region where the magnetic field vector points straight up. The magn.;do 6nqb8aa//ab :8 o:a+hwbo chwvietic field suddenly 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 tablejjv)hdr5 v1g 7/hbi8d h ky3b. top in a region where the magnetic field points straight downv8hrkb.i djd5v/b1j3 yh7 )hg. 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 horizontal table and carries an ever-increasing5-i0v lnp/iwm current northward. Two coils of wire lie flat on the table, one on e- 05inpmil/wvither 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 e62jj*fu9gir+f-2r8 lw;+7uwx+ kkexaox j zintering first. As the north pole enters the wire, the induced current will be (as viewed fr26xge2;rurjk8jfjx+ -a9 u7lzf+ okx* wii+w om 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 ayp m+okv1ap/ w+2xoa-g/ 1 i (huwzy1wt constant 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 axis of ro11/wz-+imvy(aphk u p a/x+go o1y2wwtation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whose010jwsxpdp t 3 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 if the inds1x 30jd0wp tpuced $emf$ 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.m5m3twl9q k6b
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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 v9 xo t9nd3nrjs 1(*d8xe;rlhwp17ehthat 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 f085*qejol l; b nxtqq d;0lxu,ield. 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 directio:jco 2t uuavmc z,;6m6s7m sh9n) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerninmc,c os9t v zmh62;ms7j:au6 ug the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular .z .+o)f8qzbqtk no8 dvelocity $\omega$ 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 bno+b kfez:, /1 z:ojcxg82c df:b f(mtransforms

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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 revolug*q)g np stv+oi a4b to6vq;ik (0y6)btions each second. The frequency of thvpogb)o(iyqi ;q 6 s)kag*6 b+t0nv t4e $emf$ 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 oo if (/zf;,ulused 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 dh (wt ,gt8 4b-qqwpxh1toca40 evice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more,seu2 m 4ywz.u loops than the primary coil then it is ause.m4u z yw,2

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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 cg v)6 1pfnk5ithe primary coil contains more loops than the secondary coil then ii5nf g)6k1pv ct is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power i4l;fy*bcmv)bks/ n ;znput

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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 ci0.wce;p vj)gkrcuit,

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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 batt mxp1, qqa4 z7 ;eadprbg d;pg/d-/fx)ery of constant terminal voltage. At the moment c-gqp)bmpdqd/;da41p, gxf;e r x/ za7ontact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of consta1qedc8 yvcu 86ncuqce86d1vy8 t terminal 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 inductan41rzfel035y ptrvqm51 ji5 nyce 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 induzwmln iz 0)p22ctance 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 series to a b+ u0qs+ ,uelq ,:+ ligsntlfd(attery. The time constant for the circuit represents the time required for the current to reac,llqd +nef+(gul,ut 0s +q s:ih

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery.yj;0t 3ue 5zjg The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requi50ztje;gj3yu red 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 exlf 7l-5(uia;zveeu he:;gz2) 1smaijcept:

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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. a( ty 4xxp5b(s w9nc4d7 m9gaoOn 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*lh61l (l4m9i zrxojr circuit, the currenrl jzl*x (4rlh69 1omit

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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 whatv7p- ih ag 3: vf z7(g+alwuz8. z:ykn8vc1klo factor when the frequency 1nzz8 7ki(3+ph: ag8-.fy zca:7lvvlouvwk gis 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 thes7*b+,szb2ba szi yw* AC voltage across an inductor is doubled, the inductive reactance of 7s b,z2a* sbb*zi+ swythat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acr3o .alk97kaqp8h .wv coss an inductor approaches zero, the inductive reactance of that ca.p vh8l7o 39aq.w ckkoil

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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 this circuit, th.) yh j;sc4nh erq hr.:ey,hvd;7h/qte currevyqtd4./ e;e hrqh ;7hs,h:hcrj .yn)nt

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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 whatvcz z/0ica05 dcse vcku4(c51 factor when the frequency icezz v01 dcu cv5c(5/i ksa0c4s 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 app:5k cj3e i4dfjroaches zero, the capacitiv ec :jf3ji4dk5e 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 ind;:h(ba0u f utmuctor and capacitor in a RLCau(0 b:f; hmtu 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 defined aszvkce,m h4 m 6(sx:f rmg;(sb, $\cos M = R/Z$, 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 +oi:-o zxvpr)g)) dcg the circuit increases if R increases. When))gx ozv-+:rp g)oicd is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases zg89hp/p )ad gif $X_L$ 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 d -p,og:xgtf ($X_C$ 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 bot65fc-: im,kir8pd 3srvl a.vn h double in an LRC series circuit, the resonantimr5v,n s f :63vdc. pr-l8kai 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 voltageri( .nv)h(hs8,jzcj2 urv 5 fd. 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 aqtlzl eg/ gx j)9z0bsk6.i)*occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifn ,u6blt n h4-8nykhn1orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lo k-bn hl6nyn8hu4t1n ,op 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 magne8v rms5tm8g;v7wvno *4tshp8tic field of 0.20 T. Find the magnetic flux through the loop when to gr4ms s8v;m78vp8n* vw5ththe 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 magne+ +yy,uf nc0i1zf0rnd tic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are 0i0 yc1,nu dnff+ zyr+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 *e x +yhi-ynnu .j)g4v+tf:dable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes r;b,0kf-gl. vdit4g j 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 sidhx13 mqn 8/qhhmzfjt6w3a 2d6 es 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field ch83dhw3hft6 2maj qzqm h6/n1 xanges 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 2yc19jm49z)t i ffi ziturns 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 areaht,3e5.w, l i2bs k-s tg-evpp $0.20 \; m^{2}$ 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 horizontan;fp6weemc 1 (a3 vdr*lly at a location where the dcvpdewaerf*m1; n(63 ownward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m longm bl;(9jnweh. yel/ c2 rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of il e .njmcl h/eywb;92(ts ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a crog pc5wh+eq6- fd)bfy*pqff3fxe 6n8(ss-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 consistj1kj72ccbb 9du ,jn7 ps of 100 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 $emf$.

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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 8p;* yqc4lmet:* q6qt a0 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 t*e q:* y4qmat6qc;lpaxis 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 10cu jfgenu l7) rsg3+1q(ij0 ow,nx+ .q0 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 conrb2zd cig/:bh /ge ,g9ar(j;wstruct a simple AC generator with an output of 12 V maximum when ;e /wi bgagrgdj9z/rc2b: (,hrotated 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 1/r *0x 3etzuqn+rtmo with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance ov;k4r0vjig6rq-o k:b05a ,yjs 5avk lf 6.00 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 rey7x/s ogi.a3 zsistance of 6.00 W. The motor operates on 120 V AC, and when runoi7. g y/s3xzaning 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 connected to a 24-V power supply.x*oxl9rkg5b-+f5 p+j t6k wcu The operating curre b- j+rcp* g 59f+oxku5xktwl6nt 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( 8pg 0a0ohyfj*b 42bh:oc7xtu / frqace 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. p02r7tbhh jfy4/*0 b uaoxq (:cog8af 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 /qo vfn1oipt/ ren7 yngwy6f4a1w1 93power supply. The operating current is 1.0 A at fulg pn31/wvn fn4io1y7e6foray/t91q wl 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 pr:iwzhm.g .19 vv8eluvimary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primbbq i4lwo2/g 1s)n- ehary of a transformer causes 14 A to flow in the secondary. How many 4hgweb nq/-isb)12o lturns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns joij8/5oqsc fovk pj.97 r94c4z5 zpuare necessary in a 110-V primary if the 24-V secondary has c8p5f op5zvr. ukoj4s9jq9icz47 oj/ 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 2bh,5 bk,b7 fhl000-turn secondary coil. If the current in the secondary is 3.0 A, whatk ,h 75,bflbbh 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 f69( wvuhd ebbubqy* 4k ij1v(n6 p3m2the primary of a transformer. Assuming 100% efficiency, howbm4*nqhv2ep6uui k9(6v(1f3b dby jw 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 transfmx+l t9 y6cts:ormer provides 7500 V at 10.0 mA. The primary coil xc 9lm+ytt:s6 operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary ct ):ql,: i(dewcnwg* voil and 300 turns on its seconge, l(i t :wc:vqd)nw*dary coil. 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 primaryyzo -*36iwi,tbk v o+vllou .(ok p+/c coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what c cvyozko+p3i(l+*-w/k6o vl,io t bu.urrent 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 - 7-/rah pouvev)3 mophas 200 turns. If the input current at the primary )-3-o/avh vmpr eu o7pis 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 secon/mn.5p f 7 xbt+zj*w6(w.g ol9gipyundary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volp6g5yjzxm l+./ p(*ni fgtwbno u.97wtage 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 ha/ ,r: hzs/4o4hqjasjls;m:xes 200 turns. If the power input to the primary is 100 W, we can expect the pow,z js mrxah4l/4/ejss:;o q:her 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 u6 wah.4tn pd ppp (rwp7p,;i: doxdq*-p to 4500 V by a transformetwrp6-p*op47a(i.np pd w x: p,;d dqhr and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuniew*x e+;r0kfx+-psu. zqv; ally stepped up to 4500 V by a transformer and transmitted through a power linnk+z;uee.iw *0 v;qr+ -fs pxxe 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 m6cq2kk,v(hmif n1 /wcurrent at 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 the transmission line if the voltage is not steppwqm2/kvf m1kin6, ch(ed 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 lr, l c4b(l0 4d(d)e irva;dkpnine 50 km long has a total resistance of 0.60 W. A genera4pr ;bl ndcd,k(drevl(40a )itor 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 used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gen f 7uf8iquz*c7erator produces 100 V at 70 A. In order to reduce energy loss due tfz7u7 qcu8*ifo heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powetnh1pin2e 56drb0 g9j r would be lost if the power were transmitted at 3000 V instead 90ei2p g j1r6bd hnt5nof 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 xcw dmi;xigb)4/5m/ e 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 exce/m;wgxxm idcbe/ i4 )5ed 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 s/i b6-/pylmmk f1(w/:wv m*q ltm r,iotored in the coil's magnetit wfi*mm (i/b-, k6/:p ym/qvoll1m rwc 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 resistor 0die eir8b )l (24ocvpand an 18-H inductor. What is this circuit's tio pcv)4d 2el8e r0b(iime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit wh) j/tjrtn).ix ere 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 120q6ikm wlurqnf;- 7 1zp v4;za/-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 resistanr( )-kiktg )t7q9xp jnce of the la -qrp7t)nt9j x (kk)gimp?

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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 powephy7c7(. h hvxr supply. What is the peak current through the resiph yvhc7.h 7(xstor?

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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. What is the df-oz dwx(f 5na2.;bapower dissip5a -a2ow(xfdn f.db;zated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist6- 9zh l8amvpuor 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 istol ,6dva5q4 j $I = 0.80 \sin (240 t)$. 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 resisto( +inmaxob g3gj7hu0r78ei4sr is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mHa/q)zp ysq 7o( 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 re 6sb*blg3bzub0(jir lvwnu o90(0 + umactance 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* qx. voz-ikq:.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 reackrrwstfc( a2wx z(r6g3kh ,-d 24bgb0tance 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 60nqdn :td70( uc-mH inductor when 120 V AC at a frequency of 20 kHz is appltunnc (d0 dq:7ied 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 thagx)f)p) i/wp/c. g tsrough 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-mF capacitor at 10 kHznraaz2 ) qoq t81;403pdf9z dplfvc j6?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reac/ ,ydj n-8rch/ 9ppgritance 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 reactz 5iix2 qnh1)x 8(dl mcq4otbrt* 3(dlance 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 93dpc7pilm7dl1s0 2s zzt ;sacapacitive reactance of a 0.010-mF capacitor be 100 W7;z li9cs d2ztssapl7 3 10dmp?

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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 th43w57ioy r ox0j +nr:ksrvf ssh:)qochl //5 brough a 0.0010-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 circuit with 12.0 W rvw2 dnjf55jxb2: ek4 kesistance, 15.0 W inductive reactan 4 5x2nj5kve fbwk:2jdce, 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, et5msp0 :y5yxzi i z6;g1wm6x 20-mH coil, and 1.0-mF capacitor are connected in serizizw0 :m ipmg e 1;6yt5x5s6xyes?

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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-dan;q 5:vl uiq1+ m.kwW resistor, 20-mH coil, and 1.0-mF capacitor alnk dwq1m+ av;5:i.uqre 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 connected in series with a 20-mH inductor,mzmv072hq fdqruw )-mz:- th 7 what is the impedancer zuqzd7w: tq7- -h2v)0hmm fm 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 ibu ;4lvm2jijn9 az3x1n series with a 20-mH inductor, what is the ph21mx l9i43jbnj a;vuzase 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-mlid +ap2em 8g/F capacitor for a total impedance of 100 pe 8da2+/gm liW at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed d+8ax flyz.zn/v7gx2 , gf t1ain series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz .vfyzdx8nlagg, x2/ta7+z 1f?

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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 win3x xei/4l za:jdfn: )( ,qhzith a 450-mH inductor at 5000 Hz for a total impedance of i4) xdzj 3 enla/h (q:izf,nx: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 w icc0snqo*9 4dith a 100-kW resistor at 1.0-MHz for a total impedance o0isd nc c94*qof 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 connect z66.:e/iep vvpd*lowah 10yo ed in series with a 20-mF capacitor. What is the impedanceel/zi 6 poadoe1.hvp6w:0yv* at 1000 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 need-m)l c4rj)3wmilcxk + qysn)b fd.:6led in series with a 10-mF capacitor at 1.0 kHz for a total +)x)ri nwfyq 36s b:j.cl4)lkld-mcm impedance 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 serieshj+3myogh6 c ) with a 10-mF capacitor at 1.0 kHz for a phase an+gcy3o)j hm6 hgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.f:uj p4l unn1b pi2cytx+j rfc6:b63)0 kHz for a total impedaxj4b6n1yr p6bu:j:3ltc c )p+ f2iu nfnce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the phz,ok, 67fmjs0;lat3lwq dpz0 ase td ,m7 ll3fj6,p 0zz ak;0qwsoangle?

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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, an -u-uf,is-w x4doamwdrz+j* c+ z0 zn,d 1.0-mF capacitor areu z*xu-fadw0ondj, w+-+zr4 csi,-mz 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 cog07rep /4z7pn) fh fnrnsists of 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. Whe/)p0nh ff7rn4r 7gp zat is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactancf0)bv lg1eu3in4 ev p7e 30 W, and an inductor of inductive reactance 30 W arilep 71g4)e nv 3bfu0ve 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 se qm;- dx2sl6 n/csjuop95/hz tbp: /llries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suj/q2/-u p mxlo5zt;pss:cn lb 9/ld6hpply?

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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 t5qtq;f,8(bbphb2b nvcz4 k9 of8bt 9c5( v hq2 pnkqbzb;ftb4, $40^{\circ}$ 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 = 200-30) +k3nfm5i rt ng 8gp1zmi3ouijwf /mH, C = 10.0 mF. At what frequency should the circuit be driven in order gz jfg+3)puim3n wo k 0itnrif5 /31m8to 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 series circuit wlp,b 7cfij k96ith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecpflki 7,bj69 cted 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 nns p07op: 9bek+.3gldq q rye8,pc8k 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. Whatfr:-de(g1 cc.5y/byxrfm u )zmj4w.b is thegx -./fbj)b z5u:wdym .c4mrry(fe 1c power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuitqq r/8yt6 ;ds6n :wdm(w:fp4cd;aj nx containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whf; dsdt q64wp 8w:y:d;q /a( xc6jrnmnen 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 frequency03lsw vvvb6bze:o7 mj+yf0k9k -ow; k of a 1.0-mF capacitor and a 15-mH coil in series? 3y6o+emk;7ov-z0ljww kvb:b s fk 0v9

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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 freq1 r .)whfj8ili qnqj)s.yl- *vbe7d-quen lh-)*srf)y8w1iq. vidq7ljq- jne . bcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a (f gz+z+o;6 yuvap. hyresonant frequency of 1000 +agvh;p+yy u. zz(of6 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 anda 5lrvyc7k)+gkf yeix ,c8;-i a 40-mH coil if the resonant freq-cl 5k e+xii7cgrykaf8v;y ),uency of the circuit is to be 1000 Hz?

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