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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 bl5;kltdg *wz/8a5 hh magnetic 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 stcv yf0g 52ti)iates 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 vk3 .ohgh:wx3 coil produces what kind of change on the3w vhk:oh.g x3 induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire producevh rjw;8q; wa5a5ncw8/tzr u-ch/j6;m7c i pss what kind of change on the i;ch;/wpszm 8h5jranr68c u7c wvj5 q t-wa/ i;nduced $emf$, 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 rmf:vja l3.m/p*fvghhx0m 5 .produces what kind of change on the induc.mg jm0rx/hv 5*f: lhmvpf3.a ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an ;rb w9)i8r9 )-aqsa aoz po9wd$emf$ 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 dn *lsrgsln) 7gw9 3n8iirection of an induced current in a conductor will be that which tends to produce which of the nn3 g9) gnl* wils7sr8following 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 horizontcbncac7 8(; glal table. A bar magnet is held above its center with its north pole poi7cb cn g8l;(canting 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 al dy 0sk3rv006*qe o81 w92xfcbk kauk horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed1av k32 *0q 09 klkwd 6k8csrubfxyeo0 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 qj.c4g4c.s+r9jwu; i *0hwva igcp i: 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 currentp i:4j qs.+*jivghu9.c0agwcr4i w c; 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 regi+us hqlds 33q+ bxf,6son where the magnetic field vector points straight up. The magnetic field suddenly grows stru,+s s6l hsqfbxq3d+3onger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where thet:d d(bf,n(m /o ty oe fcwxb5v:w2d,2 magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, whatfb: ft ob,5e(w:d/n 2d(w oc ty,xdvm2 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-increasinuy pm;6o bhkagv2 16u/-w tuz+g current northward. Tw2g-k6 mz1u;au/v wb+6to yhupo coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire wit.ilkpp okg p*7+ 97btrh the north pole entering first. As the north pole enters the wire, the induced current will be (as vie7igrp k*o. 7p tlk+p9bwed 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 /7wnf 7p4xcke4ck oh w5 8vg6his rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dowg78p4xc ek54o wcf v6hnhwk /7n, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an w8++3+huq:mdt. o bw6kl dnzaaxis whose direction can be varied. I +qd+u+d h.b6mw3wl:k toanz8n 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.92 jj85nk0 7wnjcreb u
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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 ja q*j dui67cil9yef90 fx7:8i1gp ulthat 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 fo b /w6-tbpo5kield. 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 (oriente*.pc2eq f)gst/f *qi zd in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rq).qecf ig2z* pf *ts/od.

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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 angd8 hd /o5vw a9 jn;m+dwvj0wr(zw,k9 gular 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 trasmcvivt t)i4q)j3 q++nsforms

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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 thro)b meknkin b 5gh+d .ze6n5(a6ugh 60 revolutions each second. The frequency of thebni+a knbk6)e5mn.dz 5 6( ghe $emf$ 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 debnwkv: 2*c*aivice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device 2.spok3mn +;z majys3 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 t 6ib3f;6s dqys/qdwi .he secondary coil contains more loops than the primary coil then it is ;qs q6/ w3s.iyid db6fa

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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 pn/l e+ -xce qz/ainj.(rimary coil contains more loops than the secondary coil then -nn ./j/eealx(zq+ci 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 power inputjjq2-lz0pq yb 9+4mua

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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 circuit am4qhm 8txmopy, k6/.l)s ia2yh rq-5,

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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 seriesn;y 7w7ha3vjxi3r cbyoh.* z. to an ideal battery of constant terminal voltage. At the momentbri7 jv y.*wzac7y. o;h3n3 xh 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 connected in series to an ideal battlfp 7ro)zbbbf*os 3 57ery of constant terminal voltage. At the moment contact is made with *zpb7bs o5) ol f7rf3bthe battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R lsesr8f -ik y.*qdq 5t d;mx+;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 induc3 /nbl ekq;v sf6)9ayptance 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 iy+px5e: y1un vn series to a battery. The time constant for the circuit represents the time required for theny 1xyu+pv: 5e 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 connected in series to a battery. The battery isq-or8 uad/-v* ab: fg(q8icnr suddenly removed from the circuit. The8cnar/qr8 dqogf:-* (au-ibv 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 have the same units exc -pf/ba*dd2 4ftj-)zbhq4fxyept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connectep3wma+ r+t5p ad to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to anjrtw(65xah h:i) jne- AC power supply. In this circuit, the currenjt h6 r(jhia-xw5ne :)t

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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 m(o+-t 2rv z1yz+ 0vao frwloi :;y9oywhat factor when the frequency is tyzryvyl(o w;+fv+1 a9oi zm-o:ot2r 0 ripled?

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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 voltag6c.u f-u ry8tze across an inductor is doubled, the inductive reactance of that izfc -u.y6ur t8nductor

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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 volt9tcx;)gwffijy r5 )m3 age across an inductor approaches zero, the inducfi yjc;)r x9m3w 5fg)ttive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit,m arzqwr8q71/, jcbg 0 the current/7rjbqg8ac1 m qr0w,z

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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 changesxhdkzien)0 -ogt2 k.* by what factor when the frequend2xk it z n*ghe)ko0.-cy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capac8 a3zxfg;h 6(u4kq xtoitive rku;x3q x 4z6(gthao8f eactance 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 inductoe/dp b kdo83uryq(p)q4 -p40sj xcf -lr and capacitor in a RLC s/ -pf)0yo b pdkplqcj3x4 48desq-ur(eries 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 m4p 5zs ds dngf,975gdcircuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increazd 1e0xdudl76( g9y pwses. When is this sld6yed pw1du(70 xzg 9tatement 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. jr(gnkzw 09 g5The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases5e:bv0)xzr6. ubj 3y 2l bkv w-mpvil2 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 do 7+,nb trrmgrni,+ ;apuble in an LRC series circuit, the resonant frequency of tha m;,++rtanbn ipr,7 grt 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 vol j/0vva o2ak)8jmpne,tage. 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 vqc 92p 6::rk4vv acvlcircuit 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 ira:rl6lo p,/e s rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magllp /o:r6ar,enetic 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 magnetic field of 0.2t; *i+c.nc thox,fkd4v:cb 3a0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fafbc+xdcckt3i;o.v 4,nt h: *ield 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 ra8g*k xmfj(,h3h ff+-8wo wl jxdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planfwx, h m8 h*jf jlo3(wg-8+fkxe of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced from*fhi l2 7/ 5zasg;)a/ o p8:o; upaigoy7eglir $1.0 \; m^{2}$ 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 from /kpi *vlm7vuu .e e6.c$4.0 \times 10^{-5} \; Wb$ 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 wirj1vf5 hm b2k, e:+x 6qkvhyeq(e 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 kj vqk 6e: vq2h, (1xfhm5ye+bfrom 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 0uq wg.+ .04z nofzhfm15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ar/q. x ,z(crp/hzer,mgea $0.20 \; m^{2}$ 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 h q.k/dk1z op:location where the downward c1kd . pk/:hzqoomponent 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 rotap5w59om ) b7qh, i eu+.n yovnhp*d*fqtes at a constant angular velocity of 2.0 rad/s about a vertical axv,uef9bp*nwp7q+ d5 qy)h*.noh5 io mis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area zmb+rfyoo9+ *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 wi 1 2huh:ia,sc6y*o vu) h4vkxmre 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 krv5g j jqw .m.t e72tkuu;57mon its armature. Each loop is 12 cm long and 8 cm wide. The armature rotateq2u.. kjt tj;m5mr5 ku 7weg7vs 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 wire o ivu ei4x.cngy/hka)30 vfn3 879h nkyf area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator wc,equ3:jhlf sl+ ia,b9o, na/ith an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating l/nloi,,s9qj f bh u:+aea3,ccoil 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 maxr kszivjv+yxi4..o)6m1 vn 3q mk-h,nimum $emf$ 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 h+ 21moo cbi8dpave a resistance of 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 resistance of 6.ld3,b tdrtosmds hrdy.7 g8(g s2-6q :d0 aoj200 W. The motor operates on 120 V AC, and when running at full spe2joda3 7 oqlbtdt. r:rgd2 s y(smdg8ds- 60,hed 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 con chdn/- jt;f,b2 rsou0nected to a 24-V power supply. The operating current is 1.0 A. What is tbtd ,cuo-2;0hrfjn s /he 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. y5l4r)fmidrzx k4f jo q;:6/jwfr x0u2kvz8 6 The operating current is 1.0 A at full speed. What is the r6 fixo lzjfk)fu x/jz60;rkqm w42r58d4y:vback $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power su+x j.1jxbq7vv -su7 rrpply. The operating current is 1.0 A at full speed. What i+7juv r j7bq1v-.rxxs s 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 q21ni jg,p p)lvoltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow uv;loy v1z:9 win the secondary. How many turns ar1 wuvyo9z: vl;e 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 cx;c 5r l+ux9tturns are necessary in a 110-V primary if the 24-V secondary has x uc;xc95rt+l 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 coiln: y:cxv 7yw8f4 nus7:pgj dcf6w1 -cwdc9- th and a 2000-turn secondary coil. If the current in wt-w7fcch6dy 71uf9cg4:ds8xj- nyc: wv:pnthe secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows 2jbkpp4u2 cs/ in the primary of a transformer. Assuming 100% efficiency, how many 24jkps/2bc u pamps 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 pr a i:184 .8udh-un*sxeqax c+ f, 16shucrqjxtovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the pc:1hdcj 8+ -rs6hes,1 i8xf4ua tqxqu u*x an.rimary 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 anaisq z,qy z.l8ek59 -pd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primaqp zsz-l9,5ek.8 qyiary, 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 5a zymu 6.ip dqs-(u(lturns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pis. (q (dla-u5uzym6 primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 7q8 7 jdz1a2cpu9lugw 200 turns. If the input current at the primary is 1gwpzuc2l781a 7du9 jq 00 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 l3fbee/2rn 2gcbk5v2 200 turns. If the inp r2 kcgn2elb2/f3v be5ut 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 transforme.cdsq ozm yw0s/* goxj/ w84ksv9hb t38ff3w9r has 100 turns and its secondary has 200 turns. If the power inpuqk.d/wts*04zmxfgbwvjc9 h w8 3 9soyf/s 83ot to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Tfa3 g9nqb9kuwj0rrws.*/3f 7tzd 8o pd4:yavhe 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 number of turns in the secz7 *ufyw n jk0p 4q.:3 odvsrrt8g9waf9/ab3dondary 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 currm1yspqwn :6f :ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power 1 n6smfw:: pyqline of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppja.aiv+8ax *z ed up tza8j*va+ ai.xo 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 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 l sxm.w/byu.fkmagb+,lpe,92+ sn rg 2ong 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 transmisnlby wskf2,m/g2m.re p9 .x, abs+ g+usion 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 resistanc.fzszwr 5 )o*v 2vfo4ye of 0.60 W. A generator produces 100 V at 70 A. In order to reduw )v.f*5 zyzo4vfsro2 ce 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 V. How much less power would be lixq/+59guhxz 8r 6qqwost if the power we9 x +uqz5w 8xq/6irqghre transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is tu,,wtun gwt24flx h/+a nlw7:o 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 transm ul an,+:7wuwwx n2/,4hlgttf ission 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 5.0cf9nvx2igls g5ms;31,r5g z i A. How much energy is stored in the coil'5v cf g59izg1,3rg si;lsxmn2s magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H indu9 hd.p ta7c, *ovyegq7brupr1 88zb5 yctor. What is this z1v y9ho* 7puy.b85rcdt gpb 87raeq,circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circ0 h+) ncj*0q*zsc-)advzs r emuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a7b8i*mvu r x b1u b-5zys/ s*f0mrsey. 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 into a 120-V AC outlet. What i1 uq t*i5 ey4-v7pqvkqs the resistance of the la yqe* 5q7pi-1 tvkvqu4mp?

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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 z+mk ruj*;ta;the peak current through the m;a u+ktz*r;j 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 suppqfb87fo6 do vrjm .a6)ly. What is the power dissipatedoo67rmqa j8d6b f) .fv 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 resi m i9(:ioi-mfroa nq:7m(mmb*stor 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 isoo x-1.wtg:d g $I = 0.80 \sin (240 t)$. 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 507 /lbj h1fvj.h-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 vh6,w1c jtcz/ at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil atcg0j:t3rtpm)9 m (myz 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-mHcxal;md6q, 6 j.9d i, c4 7xisuyil1a4p8llpj 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 reactance at 1izk;:x y7d /ww ;rsck1n+xb :a000 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 atw c-.wx*xjoa/v5f/ l frequency of 20 kHz is applied to tx w jlw xoca5f/v/-.*it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, od ny/l (utrin*28 kf160.0 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 capph ,r2;gdc dpsxyb)*zw3- k 7cacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of 1w(cx5p*yka ;,gvg klcapacitive 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 reactn+p8c j 94blrgx t6(fcance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.01k3xs c(s,qo747p(ysed, ia +h:a cz ce0-mF capacitor be 100 Wex4 (i(caoaes3 scqd,z 7ys7h+, :kpc ?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 Vs)i 3 0a vkgusvot3j7/?

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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 cice.x5mm-p0edg; -c /ivm 9xgurcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacta 9gm. mxedxp;c e0vm/cgi u--5nce?

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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-Wpdx4xd)(13m pn 4ymb-vw lc5r resistor, 20-mH coil, and 1.0-mF capac drb(mwnyl p4v4x)1- 5m3p xcditor 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 1nls4-ul k0m(f00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected nmsf(kl 4- lu0in 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 sauez17 + ydwub;- oneqx3enk1j;f/ +connected in series with a 20-mH inductor, what is the inukzn e1js+e +fxedwb/-uo; ;3q17y ampedance 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 c:t ,9zpb7 bz /rtyou5donnected in series with a 20-mH inductor, what is the phase,zd/u : ttzboy5p r7b9 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 wia m7ewi6nqbq 7 2;:uoc ja)(toth a 20-mH coil and 1.0-mF capacitorcq77 6:be2a oqujw iao(ntm ); 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 following capacitances cod9au)az30 ,r qu4 yc4 ecs9iis needed in series with a 100-W resistor and 15-mH coil to get a tota,es9 q40y zuduo4 3cac )i9cral 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 Hz foqlnps50/ :c5o u yynf.r a total impedance of 4000y5u qly.0n/n pf 5:soc0 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 ar2h+hymj 6flq;:8 wga en b7k+ 100-kW resistor at 1.0-MHz for a total hmh +b2 :frek 7+wq8ynag6lj;impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series wi(m9bmwdy2x y; q4u5lngi q :*gth a 20-mF capacitor. What is the impedance at 1000 Hz: i4*y2bngmm dql ux(qgy9;5w?

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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 s6v.k aoau/m ,jak:t2f rix.) with a 10-mF capacitor at 1.0 kHz for a totaloaaksf 6 v m.xi/,utar:k.2j ) 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 series with avc 0v:,de:fqy 10-mF capacitor at 1.0 kHz for a phase angleeqvy vd:f: ,c0 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 wigme:h7i1 xhw hi;.e1tth a 30-W resistor at 1.0 kHz for a total imped tig7 .1e1 e;hmhwxi:hance 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 capacitor0+ uhtmz( nih d5dc(os1nt n56 at 120 Hz. What is the phase anm+5( 0(c5 ddui otnnzshnt16h gle?

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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 a3 a yltyg*2j9cxi ug/+lhu9q ;nd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connt+ g qcgax*uiyujlh3y/9;2 l9 ected 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, a 10.0-mF capacitor,, hbf;t+s l+vd and a 0.350-H inductor. The circuit is connected ts+t hl d,bf+;vo a 120-V, 60-Hz power supply. What 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 reactiuh19 -junf/a igw*i/ msio*9ance 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 this cii-*9uo*um 9 is/iajn ih1g/wfrcuit?

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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 ang2b a -hzdk;em2ie,9 : yov b/2,6w5uazeohzsyle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conn62iz2e-yk bsa: ye,; z/h9d 2uo5oabv,mhzewected 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 an:dr+7iey +u yigle of yuy+:de7+i ir$40^{\circ}$ 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. +uxme.7qck2m0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivin 7mu2.qkxc me+g 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 f;v:orw( , 7h;8rrxbg 3k gmm8yhs+d zW resistance, 15.0 W inductive reactance, and 10.0 W capa+r:8dr zkw f7gvh3( ; mb8myhox;r ,sgcitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC c)s+ji5buxnf 3myom4 70j8l ho ircuit 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 af)f9oe npukahjw:*j.h9* pi6 n impedance of 60 W and a resistance of 30 W. What is the power f*j)pk hn 6f:fep9hw*.j9 uiaoactor?

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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-W resistow1 qrv ss5k;+sr, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supsq+ks ; 1ws5vrply?

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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 af-; gb. -tic :dpqvsk n9,iw;lnd a 15-mH coil in series?twv;d.i,ifc:lgn- q9 ; pb- sk

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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 fvw9a 6zm9op.dor a resonant frequency of 10 kHz?6 v9 d9pao.mwz

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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 induct. l2l.om anv17)iq el;gqea9lor for a resonant frequency of)e9q.glqoaenv 1.ll2mia;l 7 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor mus1hu -vwkx+t*f- j k1hrt be placed in series with a 30-W resistor and a 40-mH coil if the reson x*w-th- +vukr k1j1fhant frequency of the circuit is to be 1000 Hz?

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