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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 i5:xxswys,zcfp-)18ys7u pj ij +pa ) 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 that tafk; x 908yxwnhe $emf$ 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 cd7ae5. /dwvkb oil produces what kind of change on t7d ebw/.avkd5he 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 f1;s)2lutar t7kx1rsj ield through a loop of wire produces what kind of change on 21 kj71xr t;)stu rlsathe 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 onoaduwupj p*1fg2x); bt/o; n; the inducedox 1t wf)p2j;;o*n/g dubu ;pa $emf$, 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 fiel*o(l:44r fbwkn 1vedv d 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 i(pyk*bm,54jylidh0t tj j ( k0nduced current in a conductor will be that which tends to produce which of the follmjj(k, t(*by y4t0ljpkhd 5i0 owing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar hd3y7/za(aaa)2aj,itd/jy p magnet is held above its a73jt zi)ay (dd2hjpaa ,/ay/ center with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovqk:,a zdv m70be its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces vk:ad , bmz70q(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 region whereum 18iiy 8,xav the magnetic field vector points straight up. The magnetic field vanishes suddivm8y1,xa 8 iuenly. 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 field voce jc3,/rrsh2xepwe a/0s;5dxl:k ) nt 47woector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of tt4, :epxssc2le aw jn/7o hrk0;)c/5do e3xwrhe 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 magnetic fiedzr u7vv0j+f 0 3.prvhld points straight down. The magnetic field dihfj0u.v70vzrpd r+ 3vsappears 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 carrbne*:tge6 u g;wd0 0ejk2xg;qies an ever-increasing current northward. Two coils of wire lie flat on the table, one on either bee:wtge * u gn2;kqxgdj6;00side 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.cn5e 5elsw i)1 5ribf entering first. As the north pole enters the wire, the induced current will be (as viewed)ebr5wife.5n sc1li5 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 constantv*j 7ho+ced. ize, w,r angular speed about an axis whose direction can be varied. In aro .dej7w,*+e cz ,ivh 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 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 wirecn ilol0qz uw,78h+,b is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magcz ,l b,8i0+qlhwon7unetic 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.uv2xxn c 7chaff ;03r(bet 7c)
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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 hkdc ()9,h:lx2pcrjcthat 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 magnetiuma cl9*k+, rd;sjxz *c field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at co(rsigxx34mglv 7z1*t nstant velocity through a magnetic field that points straigh7 gxzls t *34gx1vm(rit 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 rocw1xrnf y:f a n.qqd dep7:3 k3g7c6*dtates at 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 generator7 il ye:co1i:m transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotal:na9rn8zaxufd:5n4x q*)a wlg18m jh7 a al5tes through 60 revolutions each second. The frequency of t:a8 5n :wax nr1 la4m9lal8zxqgan*j 7)uhd f5he $emf$ 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 usedfmkl / /jk z(z2a;1ers0 betv5 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 devi1 (:/yvbvokntb0w zsym my -+7ce 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 secuv)f6szo 2og1m2ob v d )/r4ppondary coil contains more loops than the primary coil then io4uf6gv1vs2 od rbp)mz p2/)ot 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 pr+q3 4gd 6n jfn eb63vu)/ka*acr3uwgiimary coil contains more loops than the secondary coil then it is aieq*wb4j3a 3r fuug gd3k6c6 an)v+/n

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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 7xg pgfc/sys )1(sv*dh;sc f *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 resona6(vdv l k1fu1nnt 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 inductor are connected in series to an ideal battery ofho6n3p: 5*6 dhzisbbz constant terminal voltage. At the moment contact is made with the battery, the voltage across the:6*36ipz sbozhnd h5b 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 cvtq+ gw: f29eydo z94constant terminal voltage. At the moment contact is made with the batwzfvy cg:o+ 94t2eq9dtery, 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 inductangvs 1c y5vg3 0nkw7s:nce 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 induco3 a.vxsfh/nb 3gv ))vtance 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 battery. s pr18fu9:zj rThe time constant for the circuit represents the time required for the curz8srp1 :u9fjrrent to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a8)g3-xc+ 29ghh ansth 5 agqgs battery. The battery is suddenly removed from the 5nhc8-g s 9g)2g3sa g qthhxa+circuit. The time constant for of the circuit represents 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 h4 5 cgrm.rq7bbave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On thiq*jb- de(.gpz:jjv d*s 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 poweh5: evr19c-yznv5aj ( o2ono xr supply. In this circuit, the curren v5 ocz -(yoa2v 5jnox:e9nhr1t

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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 nhs ; /ch sfrq3ro+85bchanges by what factor when the frequency is trh8ofnr;bsc s5+q /rh3ipled?

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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 voltageao8b2wh)64ickobmv7:x d y+c across an inductor is doubled, the inductive reactance hbvc7mo6:ak+8y) 2 xwdc 4ibo of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approjn3)ah c i0fe(7*nub l:s-twl5gs*g iaches zero, the inductive retl0ihfn s*be-7c3 :nlsuw)g * iaj(g5 actance 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.vfrkf7f(w)0p0 ls m+t 9 c+dou In this circuit, the currentpc0 tf)wmkf0u r do7 +f(slv+9

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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 when )4hpax ljgj(8ujb48xy0 k *g vthe frequenc p8 ba)ujg(jh4v4 jg*y0lxxk8y 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 z0nw:)rt ces5 voltage across a capacitor approaches zero, the capacitive reactance of that cas0zrwe c5 tn:)pacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor a8htmdyt jkea .2(a3 w8nd capacitor in a at d8tk2ea3jy h(m8w.RLC 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 aszg4t ;q 1h .lskzngbe c;b g1:276w78r iaxrxj $\cos M = R/Z$, 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 the circuit increases if R increa4toz/,p b vot sur d zrl-,zsa8w33s.v-;;rpkses. When is this statemenb4r, zv8k/ o3r3t,-dpszu-; ;ss.rvp lw ozatt 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 dcdqj)2kno*q d;855qwj 1hjn k-agg5r5ib.c of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of ththlu 5:-dt pq bp8 h+3loidy(:e 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 double in an LRC series cir yj-4wg44wbob cuit, the resowyb4gojwb4 -4 nant 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 ACw93 y7w+wv hmz 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 circuit occur iv 1 7lxs52qnt7xxtg;s when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20ei/+x :f+ ijs*0gz dmg T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie id+x0 /izgjg+m *fs:eld 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 magnetki3 rf990t tdkic field of 0.20 T. Find the magnetic flux through the loop wi9t ktdk 39rf0hen the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magntgkask+1y a0ui.gdl+a 4-k tnng 6(e/etic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the ma1 k -eda lg nt(gyi0tsa4k6.g a+k+un/gnetic 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 reduef:bfz u74r 1wxxy8vx5sn*md l 2i)c he6./mg ced 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 change ,lppc8m9j+hw s 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 turnsa+wzt4+() keljsdpq 61 n( dnx of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, ftxqw1 z)( nl 4nape sdj6kd++(ind 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 turnsawtdz: 8u a u43i.xh,u 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 ar6 sv3ww9 8 d.1wmo6odke6 gct8uh+hc pea $0.20 \; m^{2}$ 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 the rs.qznqxva2 6/6;5 lqi1moqy downward component of the Earth's magnq6l q52avqszyi 1nox6mq . /;retic 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 at a constant anuqt m*6b2spt8ah, x k)gular velocity of 2.0 rad/s about a vertical axis through one of its ends wa,)82up b6qmh*ttx skhile 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 dx(k7m -gda do;ksx5wi ,p5,nhas 50 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 consist+zf1 fvt rp68ts 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 80 rectangular loops on its armature. Each loop is 1kw , jm9p vh42f4b7l:vhb1huj 2 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 be the 4 uj2wlm,1:h bbjk4p7h f9 hvvmaximum 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 of0,-l dj-h)jx*gcz/hsm.s p ak31yxycv lj,-v 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 consi6 jwtcux6.s4 truct a simple AC generator with an output of 12 V maximum when rotated ats6 c6jutix.4w 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 genrc36;w /gmdemeyu n +2erator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.06ip tdtvmjqha)gu/sv,d . - -50 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 hav)zb88go 3oone e a resistance of 6.00 W. The motor operates on 120 V AC, and when runningzgo o3n )b88oe 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 supplysgv b+;:0iqmj,d l fx.7:k mfk. The operating current is 1.0 A. What is the start-up curr+; j 07:mqsvg:m f.kf,kblxi dent?

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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.k a( b)861afgy kkujflgu(x; *uc7p r* The operating cuu 7ck(ukxjagay(*;)* 8fl1u kgbp6rf rrent 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 ro 6w)l:luui ;w+) l0m f9ofrlresistance 6.0 W is connected to a 24-V power supply. The operatingwu:r o lr+w l)uf0lifm9)6o; l 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 p.gv;wy w(kwid7vepa6 h1bip qis s1/22 q*e2primary 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 prll5-5fh2)aj-+9q 3k qwvxqkv +;vb v.sxeaw fimary of a transformer causes 14 A to flow in the secondary. How many turns are in efvw+kqw-l2f. qqa-bkvj+ xa 5h)ls vxv5;39the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primml6 ahx() ledys48gr aqvl/c7vh5/ v-ary if the 24-V seced h86/gar/-l 5vq lc7ahs(vvylm 4x) ondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary con*+m;l3psr xeb1+i/rnt b d/vil. If the current in the secv 1 rsbnmdi/r+bl*t3x+n /p e;ondary 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 primarys0xmg:n il26ss jl0u; of a transformer. Assuming 100% efficiency, how 60sg s n 2jix0ll;sum: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 providesh*jv8yya7m)fx/l e l2+g )amk 7500 V at 10.0 mA. The primary coil operates )m8y+ljg e km/72a)lyh avf*xon 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 n0ontonk6ipfc ::,+ b its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what volta:c nonpi k,nf+ :0ot6bge 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 on gqw70ta 3o 5liits secondary coil. If 120 V at 2.0 A is applied to the primary, what cutw7lqa3i o g05rrent 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 2nt-d3t,xv f b2a qtga1xe;ro4*6h gh 200 turns. If the input c*her o h4-dvnta1x26t,gf3gb xq a;2turrent 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 transformer has 100 turns and its secondary has 2kpcws4; tb,r3 00 turns. If the s;br,4pc 3t kwinput voltage to 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 has 2007g)2a. x tqj zp9tm,)yoihkv*/jf2ct turns. If the power input to the primary is 100 W, we can expect thhpgo7ztk9*)2 /,jtfy.xt2vqj)mcai e 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 currentyj pzhx0bc7-1 at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lineb0xp1z-h jy7 c 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 usually stepped u;b )+0wois u)e ub-xctp to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 Weot -ixsw cu)b)+u;0b . Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage ise.nqtuv:. /o; gn9nt-6qs od c 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 t.;q-vcooe9ngu d qt:.s 6nt /nhe 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 ouw ) tv(mu*s.zj1,p pa total resistance of 0.60 W. A generator produces 100 V at 70 A. In z*, 1p mut. jws)o(vuporder 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 ldxecbuc+8 g6/ :l0ggg0 j +uznine 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transform:0g/eujl+g g+8uxz n6b dcgc0er 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 w4fo /)zjzlvqp0 (lc96-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 10jzof p) v qz9/0wll4c(00 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 * j5wbl:1df;n3s5zm mnmxg uw ek,8 ;mon a line with resistance of 0.60 W. To wmg;d;k ewm 8jfs bm1w* :un,5x5n zml3hat voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How m(s2.h:my)fzlvwc,m much energy is stored in the coil's magnetic field?:c (fm.mz)2s,lh yvwm

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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 red7 onijs5, t2lsistor and an 18-H inductor. What is this circuit's time constanjlo in 5dt7,s2t?

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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 the eqb 9vmtmhp a)r)y :;51 p,3kl*pxtulrms 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 intod(hlfst m13;x a 120-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 in)p std j1uno m(*hwe96to a 120-V AC outlet. What is the resistance of the lamp9*ewt d jn 1phu6(m)so?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is thevvduk0f;t vlb a:/5a- peak curre-5u ;v/atvlf:vb0kadnt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is theg*z depy-fmsr(.;1gw,fb6 ,ia-wup a hfk57 w power dissipated in the resistogr . a5mu- 7p-paw fi;zw, y(sd 1fegfkhwb6*,r?

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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 resisubi.ze9+/get)7/p+cee +2mnmrwh ut tor 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 rr:; qmzh r mgdj pt7*0*e)dl+rn)+wfhesistor 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 a8i.za3+3z y xf;kyk mz(hhe5k q zb:d0pvw9z( 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hz?0ouvs,:smve z8jv 2/ax.cie;

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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 r l e kisa:j 8qr2y0:)esr7l0rof 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 hm0 b 4dr):n8l 08(fzi(cupyy, x khjnbave 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 fom47bcok;j) r ; hdb ca:isq,/jr 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 frequepicpve0b,vvbng8- y2l/ s03b4 1.lz w6wna oancy of 20 kHz is app /8o1ey0c64gbw2lanwlapz0n,p -b iv b vv3. slied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through (1ijz( ;klxt ja 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 kHz+deu,* 2kgy so?

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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 capaoup u c08mgup+va28 2ucitive 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-mFl*k79zr3gp/fvx bcfr9a)do4+ k i d6e capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive re6kfh5r3;dh1so lh: *m 3tr ugq))cdq eactance of a 0.010-mF capacitor be 100 W? 5h *rmekl c h:)trd;uq s63g)fh13dqo

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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 Hzie2:4b*h()g ufc*1 *cj;lpfxqgnr ob 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 u:k+of s,xpp7 series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reac +7s,f upxo:kptance?

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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-mH coil aj, qoejbohya,1n)k9yf (r1- y 8ld fzn*;en., and 1.0-mF capacitor ,n)l1n9dhe o;nra8 yzfaykfo ybje .1qj* -(,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 a 10km l9ca3(u lr.0-W resistor, 20-mH coil, and 1.0-mF capacitor are connected au3.lr9 (km lcin 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 resistorkd 22 5wi4pa*dit+c a66gjtg.wod wp: is connected in series with a 20-mH inductor, what is the impeda:dp462 do gt6i5daa kiwg*ptw.2j+ wc nce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, .bm.5p,e8g 2v zuwzgx +vt po1what is the phase angle at 1000 H,e.g 1 v2p m+.uxwtog pbzv58zz?

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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 a ip:n-05xqk6 0y l ut)ty,ang20-mH coil and 1.0-mF capacitorp:yl) i qtgkx,a6au0 y-nn50t for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followingm5*qq ::neppg capacitances is needed in series with a 100-W resistor and 15-mHqgp5m*p:e:n q coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hzco3fe,l2j f ks2o +*fv for a total impedance of 40000 oso* cfffj2e ,+v2 kl3W?

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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 put4ngfo5,;lb v3imb 7 vdkzz-4i in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 m7vd;4 n5,flk-v biz3bg4z i okW?

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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-: n gm)bk z8:ebmz6mn*mF capacitor. What is the impedance at* ::gz6mk nm8nzbe)mb 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 needed in series with a 10-mF cap81hnd.a-lcp /s .*u tpszu s-xacitor at 1.0 kHz for a total impedancel .t-np cu/z8 x.ds1su-sph*a 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 with a 10-m b56o9yy2mqxagh*x.zF capacitor at 1.0 kHz for a phase angleq*2yh ogx xymz b56.9a 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 with3a72u ku p cts+sb;*yw a 30-W resistor at 1.0 kHz for a total impedaps7*3 +bwc y;ausukt2nce 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 1(w;to v tr*1 )2kvphpv00-mF capacitor at 120 Hz. What is the phase angl)p2hv v opt tk;(v1r*we?

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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 resis76 ktesth y;a4tor, 20-mH coil, and 1.0-mF capacitor are connected in4se;6k y7 hatt 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 10g /ou90 vn7 qa/3yb:omqalu 7q0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currem bao 97/oqq7 v0gyun:/q3 ulant 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 cyhwm qwa;i:*be* rrk -mq3r (ugf:)b0apacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in th- ug;:r * (wwybbhm3: 0krmf*iqqa)e ris 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 fhjm)gvc+tjho 6 -o;+ series RLC circuit containing a 50-W resistor, a 10-mF capacitor,m +ochjoh+g;tv)- 6 fj 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 series with a 500-W resistor for a phase angle xzce2 vq5 /an6pwv e/1ofz5wqcv/ /v 2n6eex1a p $40^{\circ}$ 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, .di wv5o;mk9 vL = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power trans5m vdw .;9kivoferred 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 s0pes2w7jj +fzm tn9e1eries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance,j27en1z jtmfwes 90p + when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuitx 0xr6+tzh;is9 b8es k 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 /b+ m/myzl5df 5kr.w gof 60 W and a resistance of 30 W. What is the power .mdg5/r fw5/kz b+lym 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 circuit containing a 50-Wi/(*qvrtbg+po 8s7qe resistor, a 10-mF capacitor, and /o*v+ p8sb(rei t7qqg a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH ctd p/voquv 2jf,y,8jqy x9a(.oil in series?,j/2ao vxv, ( f9.t 8pduqjyqy

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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 fouuw8b bz9-l 1tr a resonant frequency of 10z189tbw -u blu 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 i ac4v,rg8x oh,n series with a 3.7-mH inductor for a resonant frequency of 1r,ghcx v,o8a4 000 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 mu* wj ,2-r)/x3pxbb2ozi1qv im gx :wfsst be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hbrbi i,m3g zo*-wpqv2xsx /xw)1 jf2:z?

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