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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 asgyczm2 1,c,g re units of 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 induct/x:p1wo0sdtnh t9mdt wp.0q.ion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of z(v4 r(ksgf8 fu3w az :j46iaachange on th :u4 fz(azfias j( gravk84w63e 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 produces whalun l(92(w*ru,autdfc p. ng;r3 zwo 8v2+zjp t kind ofw w(p *2t2 ,z;jc9r.uoprnvdg n+l l (8uu3azf change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kindqyrfqgo:d d0rlcdjv/r.y* ;5,r s ;f2 of change on the indu;r:r5qrqdy,.ffr*; 2 0sdg/lcdoj y vced $emf$, 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 fies-v1d2k fmr+u ld 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 induced currxwu+i6ct+ 7ikq v -: v4 tquv:8ujij,kent in a conductor will be that which tends to produc i tu7xvi+i+ ,8vqkj4uvt c:qw-:6kju e which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abov6fmj 6jxb (h 7lp(o(cse its center with ix 66jpls h focb(7((mjts 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 h 81 rqp qz4z/ic gnto3h07g:cborizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling g03p81rgi :4c bqotnchz q7 /zmagnet 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 region where the magnetic field yx3ah dv1sq0b-2r2xq vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field3q 21aqx- rdhs0 xbvy2 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 table3kl t:d 91s hb8x6siko top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whe1hs 3 d9lki6tskobx :8n viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic field,ijx7. t-)x8 qif 53d e5f.jj lm,apsfmybw8 z points ipel,75zx)8b j8 mqsd.-m,j5 t3iafjxf .wyf straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal ta:wqgggi4 p9/hble and carries an ever-increasing current northward. Two coils of wire p 49ig :hgwq/glie 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 with the north pole ecynl6 *eb8 eh4ntering first. As the north pole 6 c yne4h8*belenters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constan/xxf aw1nq*r 7a; 2cq2ywa1 cvt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straig caq r1w72c/1q;wxnv2*y xfaa ht down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotatszh z.l p*on1p3n- jwrnlf724 ed at constant angular speed about an axis whose r.s - o*7z hj3zpp lnn421lwnfdirection 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 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./l h m7h,5rdm5eb 2rwn
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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 that adm4q*3+ws6-ozaqwajqey, )r4p 7po k n $emf$ 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 fielfa(0cf)z/ u bi 7w1 hp*wobxc5d. 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 (orienf91sf(l38zdj,w enbw .n j:urted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concernin u:(werwj3s8n,znbf19fj. dlg 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 const as/3bi +kb0c +eqah 1fgwg6/8 ww7sftant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator ddoz6x 9he2sta1;c 3 btransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The freq7jq3 zd 34w6ns tb -edmoea6,zg ,:jvkuency of the 634mtg ke do ,wqj-,jn av6zes 7bz3d:$emf$ 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 used 9nm(3tflu8i kv;lk 3 s-hjri+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 1)a31h x7 ind1hmpzputhat

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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 cox:i sdb/ c,i w:zw1iw(il contains more loops than the primary coil then it i/w(i c xbi:: wds1,wzis a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than tbg+ i +7tqvoe15bdu .lhe secondary coibv7l i e gd+5uqo+tb1.l then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the 8 91ofoy.lcpwkmy1 o/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 resonant circuit,0cd0pd* rd*tuo2z;kr

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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 ind7b 39u:;6 t igvzxkwewuctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the bwg ut3 kxz7i:b we6v;9attery, 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 cd-* 6rdtitu1wonstant terminal voltage. At the moment contact is made with the battery, td-wt 1u6rt *dihe 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 is conjyo.r6o:k 8(w vd7 0yfq)bqtnnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is 6t /7t. 1 9k)5qfiijp 1rslrirb5vtul 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 sepxtj hyv 4:o ;xk,s07lries to a battery. The time constant for the circuit represents the time required for the current to reac,0v ky4;jls x7 xo:thph

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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 arnie3rvxf i)e-.:)m +hmcq 1k be connected in series to a battery. The battery is suddenly removed from the circuit. Tehk)+e: -nm3f mbxv)c 1.iq irhe 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 excethlzs 2h nm;s- j-3mw(pt:

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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.jpru+h l fnqf/0qn6y 5i6qk6v6;hx5v On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supl n/2u ot.j-dr 5 7gmojvl5v-kply. In this circuit, the currentmjr-j2.l5n kl otu/v d5-g o7v

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance inltqqq63w2t u)2srlc1 :(tj e k an ac circuit changes by what factor when the frequency is triplkqtwe1)26: s32 ur (t ctqqjlled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage acrosdktnp q/6d( v k71g:i+ e d-,uguy*bvjs an inductor is doubled, the inductive * dpb-:u(gigvk nyvtdk7e/,q61j+dureactance 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 approrsw )/dkjz*;6dc o wx9aches zero, the inductive rwjo9*dx/z) r;wds kc6 eactance 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 c+v:a8yap/4 3wntzzi tircuit, the curre3twzzpva:n ay+/4it8 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 kdy5-bu yjd.zm..t) y changes by what factor when the frequencyzydj. 5yyd.km.) tu b- 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 capacitbc 3mta 12ah 9qdb qyi,w:vq5vit 1.i+or approaches zero, the capacitvt. ab1 :2w,q iaqh 1m3qtcbd+9ivyi5ive 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 betwel4w g a3pcl7k*en the voltages of the inductor and capacitor in a RLC serielp *wlacg437k s 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 l ufd((ta yw1-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 thec gfw/):kwj6l ,i am.i circuit increases if R increases. When is t.ia m/,lw)cjf wk 6:ighis 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 impedancecs cqk +s+/1lm 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 /aqo e y2gn:at)bp(yvk8 ac )*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 dou.icx-o aev7 dw (gw h2l3ip+o)ble in an LRC series circuit, the resona(-.wi evio+x3 od7 cpl)2gahwnt 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 circ2/wivi-+q g5 o ffsnm3 u1iv/kuit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs fd -xy w-fd,8ujggm0, 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 r:wk)d ;9 tssbe9+awmj adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic sdt;:wm9+)ebk jws a9flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uu a y4asr+(ji;niform magnetic field of 0.20 T. Find the magnetic fluxs+r jyu;a(a4i through the loop when 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 /hr*. f *ypnofentp95y2k 2fc m is 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 magnetic field vector are n ffp*hoypcne2y9k52 f.t/r*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 adjusta(sg2: eletg kx 207xwuqflhlxm856ruc61 7erble 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 chahgi0d-.z ,6utrr* s mwnges 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 sides 18 cm. Am:nwhhdbw 9.lol: ,- w uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 09 w:l,.hbdnw-om:l wh.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an areoink e1j 3zqquj8e,mp.o j1iy1zk56/a 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 anpqm6w l*hg 1v(d area $0.20 \; m^{2}$ 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 flieqbpc:;;y a ,zt4;md5z i3 bkows horizontally at a location where the downward component of the Eqpd5 bt;3zwkmi c:b o;,;a4 yzarth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocp rs ,obt+6(ffity of 2.0 rad/s about a vertical axis through one ofpbfs r of+t,(6 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 l1ox*tfxb n::uoops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of kulf- eqbft z/u2t6x *q26 h4sm-nwk3area $0.090 \; m^{2}$ 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 loopsg.:bsud .ays 0czl ,+i on its armature. Each loop is 12 cm long and 8 cm w+iuz s ya .bsc:d0l.g,ide. 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 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 consi)vpxh s;z(ti*ui uvin1g ,-q9q 7zt0wsts 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 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 gvbyym ,,p3 -mr oy.8fconstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T isv,-m83 mr.y ygb,oypf available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum p.t j.jt vs2i+ajo+co* ;q j3u$emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on ttt04viy4 x/1isjw6h$120 \; V$ 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 resistancgjvrkh1 z1p87*u2 f ooe of 6.00 W. The motor operates on 120 V AC, and when 1j*ruzgo12pf 7oh vk8running 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 resista4 +au0f46zu of9rc/ 4eokd r -wo5qnlvnce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curren04n + k5ul4d a rof49q oef/wozu-vc6rt?

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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 (p 0zw2zs nfe86.0 W is connected to a 24-V power supply. The operating current is 1.0 ezf wnz8(s0p 2A 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 internal1s*erwlr6mx mex r9+ pl;n. / mrz0h1d resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at fur*m6r ;sx.ze0ed 91m1mxlph/ n+r l wrll 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 neederllr (eof9d:v r,+:,gyt yus1d to reduce a primary 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 primary of a transforme* 3a:8kz1igr;zt- av0,;oajew us zqar causes 14 A to flow in the secondary. How many turns are in the secon: k; z- j3t 0uawva;qrs*eoia18za,zgdary?

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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 nr h tl3:x5k7vtecessary in a 110-V primary if the 24-V secondary hasxr kt t7:v53lh 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-tol5xd(i 8 upu0urn secondary coil. o 5xuu8 (p0ild If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in thed atmcr ,h)-w4 primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secoam)4d,rh c-wtndary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Thezwgav: qa7p6xj2lkl7 )gy y:4 primary coil operates on 120 V. Whap)6q7w4ayzv gxl: :2agk y7jl t 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 e4uol ii zk0+4hkh h1/on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, hhi kz+k/0iu1eo4 4lh 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 hashbui;0t3,e49tkr8ble f2dr r tef l7 ; 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2r73f;def9h0r ;btr u bete84 it2lk, l.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer hanfcxek5s twn j:z4adj7u;7 .-s 100 turns and its secondary has 200 turns. If the input current atwe47jz 5njk7fad -n :;xtc su. 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 transformevqo0 e kcmnh;molgjw9y)5+1.r has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltag)mke jlgy .c 01+9mvno hq;w5oe 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 secondawzs/g .*xrmuamc022m ry has 200 turns. If the power input to the primary is 100 W, we can expect the power output .urwcz m2mx*/ga m2s0of 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 stglrws901 )fr7ja3 rxvj3qxgqjdu*** epped up to 4500 V by a transformer af0u)7 vr3la3sxq j x1wjg *gj*9r q*rdnd 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 . 8p;y 1jl xo z140gwh58hc6ktrz ymzzV. 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 power4yzh p w yxm1l.601 8 8ckz;jr5hgozzt 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 usual x:c vgoeg15xial;ewqt .n) k*4o.zj3ly 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 th.4cveitl.kg wag:)xzox3*nqe; o 1j5 e voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. op0ipv m dv4wbcxx3+60;;j,hgc vv1rA generator produces 100 V at 70 A. In order t,o0 3pvd;v1phwv4;x vx+ j0 r6igccbmo 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 rv1.h2 aiy+kzk:nzf(aty 5n5 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,5yf:. a 1 tza(z5kr+y2hnkv in 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- 0 ,vjtx0fe:csvk4 * z5a f4.a9bikkueW line at 1000 V. How much less power would be lost if the power wer0: e t4z.k4 u0*e,av9ckix jfkas5b vfe 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 jpmmzlr+ )jy n1e-/bg7 hq*:nto 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 tra:l - m zey*/ nr+jpq)hgjb7n1mnsmission 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 much enerdpo: 4gsc( *wbgy is stored in the coil's maowbc( pdg: s*4gnetic 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 18cg mmtd0-d) 7y-H inductor. What is this circuit's time consta mctdg-m) 0d7ynt?

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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 circui/n*d :*/ne vdy mj3ta vl *ojh8kd(g9lt where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Wh-smm(mb* t:r yat 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 t jdl2(tx5f gr5a vr4k 7g,gvv;he resistance of the lamp? v v5x7k4fg;gvtdla2,j g(5rr

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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 h (fxp t+knr0)a 120-V ac power supply. What is the peak current tnxhf)(p+ k0 rthrough 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 1 q77 )-q+*p5wqchf xtgd/ nfjk20-V ac power supply. What is the power dissipated in the resistqp- f7 5whgd/ qj+x7kn)fcq* tor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through acquk (9wlk c*2 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W t(vsjxvn;kiip /,g;t 23 q4tyw 9 e2ykresistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Wrvab9il .;+( +i4y lmwyav s6p 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 1.0f*d5y ch)4lhyd0hhwtl 98g ,g-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH com:(khiswf, y 5pxl5vl-, +qe pil 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 wi q;2 j0gqrsa,mll a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reudkzs12wp2 aj(+z y-):sh fwgactance 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 inducto/9d/ qwffn(sru uee9. r when 120 V AC at a frequency of 20 kHz isn w(u /ds/eq fru.9fe9 applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a))0( cj-i w-wal pjlj;jmk ug, 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 ae 8 j n gr.oca9b:m)kzfxx5y,+ 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W ofm*qkd4e d9z5z capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance oq+ q,*rx2kab -xdw7* n9 dyxlpf 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 r ,ad/ua4cak--z ckhp)eactance of a 0.010-mF capacitor be 100 Wh-)kcaz/a-c ,p 4kda u?

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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 thuw2 n0rcpt2 ;rrough 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 resistance, 15.0 W in 0x3wslbi ;vms/k7m/wynh (/iductive reactance, and 10.0 W capacitive reactanceh s0/x knlb w3;m/(im7swv/yi?

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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 rs ,olebl-8jsr47on4 at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-sl8o7s-jlorb ,4n4 r emF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0zpc smyd:n21va ,wci3wq59 . c-mF capacitor are conniqc,1nczs2.5a y9pwdw mv c: 3ected 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-mHb8y+ 26lpu* txanrh 3x inductor, what is the impedance at 1000 Haxh*u 8y36xpn+2rl bt z?

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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 connecw oni+m(r:iy-:vjfqk .e yy+1:xcb2b ted in series with a 20-mH inductor, what is the phase angle at 1000 Hz +jx(:i1 :.b vwe-konfyi+2cqyr:m b y?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capq (p esbkf527igkh t,,acitor for a tq esb2pkh,tk( gfi 7,5otal 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 capacinndyj +:fgyz7g+( (br tances is needed in series with a 100-W resistor and 15-mH coil to get a total impgnbg+z(y7jy(:d r f+n edance 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 58k znlj-,u um1n/hyx at 5000 Hz for a total impedx15 n ,-hzmnuu/j yk8lance of 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 with a 100- r9+/,wfdfb6vc6y ucukW resistor at 1.0-MHz for a totaw cuf6+r9c u6y/ bfd,vl 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 with wem0t5ri5 jy8a 20-mF capacitor. What is the impedance at 1000t wem8y5i0j5r 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 capacitor at 1.0 kv fb*/-zzrz0 8cpzya)Hz for a total impedapb8/c0*yr z avf-z)zznce 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 needehq,: r sr26gnds1it 7yd in series with a 10-mF capacitor at 1.0 kHz for a phasess1,: n2 rq7yhti6 grd angle 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 sey mkn1r9 /tss4m0h7rs ze+id/ ries with a 30-W resistor at 1.0 kHz for a total impedance +h0mz7i/sn1e 4 yr ksd9s r/tmof 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 atrd8 u,iau5akjb*prh0 u .a )3b 120 Hz. What is the phase angleh0.r8abibpkaa53r),u d u*u j?

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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, and vavni xoggf7 u5. 2p5,1.0-mo,g 5afvpu ixv7g .25nF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistory,j f;r:ar ;dl, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whata:lf j,y;rr d; 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 reactance 30 W, and an inductor 58awzn5pewaddh 8- 8cof inductive reactance 30 W are conne 8a5h pd5wd z-e8c8awncted 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 serie+e +ovf8f.vz*:ol g7jyk*; ,prbgix js RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H in.x; k :8l*of*g ryeio+jz ,+vgfv7pj bductor, 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 phasbr tima:wavhe 1 q8(,;h *pmz*e angle ofibmv*e8 1;*zpa,w r(:qthm ah $40^{\circ}$ 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 l 5;dzcys5 *seR = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred f 5ey;scdl5z *srom 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 serisbf1.04 a;xhqtq5j.pz )ndsxes circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, whe; 5p. xjz0 ah4std) x1bqqsf.nn 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 cb2tey bi )k3hykq0)q ;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 an impedance of 60 W and a resistance of 30 W. What inei ,a6wtwqv l9 ,y54gs the pa 965vlw iqy,n4tg,ew ower 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 fac5 4sxjfc/o+(hp: joihtor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power 5/p+ iooh(:cfjjs 4 xhsupply?

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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 coil ijvuio(df h 3k +i0j:1tn series?jkfvo+ ( :it 1hu3di0j

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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 s.4h :s +fxi/slei a5hijf 5mn+3a /wlseries with a 4.7-mF capacitor for a resonant frequ/5.f a hl+ifwi:sn+his/x 5 mse4al 3jency 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 ne a4a09 ljrh3on/zb-bm eded in series with a 3.7-mH inductor for a resonant frequenar z4nhj 9 blo0am/b-3cy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in*ya, * 0ocj5u *rsrfcif,a1.dsemc/v series with a 30-W resistor and a 40-mH coil if the*,5rd i 1f*.vo0yec,*/sfrc ascma uj resonant frequency of the circuit is to be 1000 Hz?

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