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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 followingbuqh(j,* + h3pj2fkfmke ; uy/ are 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 inducti;bqwwe).aq 1v2xur 2n o5,hah on 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 c*a 8pa0yepf k :n1q:tgg-vjd3hange on the induj:n1p p3 0tgyfa k-d eg8qv*:aced $emf$, 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 wirm e6, 9ai gbmfd3m3:jje produces what kind of change on the gm3jma: di bm 9,3ej6finduced $emf$, 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 onpgma 45nov6d 4 the induced6n4 4gomp5vda $emf$, 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 aem 9v4kxc7sg -yh;g *kn $emf$ 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 rsapy+-a l yb/i 2sdq, ,10urodirection of an induced current in a conductor will be that which tends 1dabqo + rl p2iysr,ay-u,/0sto produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above itsh m8ubrc3h (p z 291uo2dhmg7* hoh:rf center with its north pole pointing down. The stationary magnet induces ((*zgf2mboh2hh9md7c u h:hr p 3o18 ruwhen 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 magnepk* ehlhc/*k4u:fo k1b+cad-z r ,o 4wt is held above its centek:eprwkcod,zc-a foh*44 +lb/ 1hk *ur with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table/0(a 3 ,hz1dory9v n3fkd vazt top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fadehv ody13,/z0fdzna3 (9tvar ks?

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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 .4ahz:ivko o qy*5sh9b/ck.jon where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, wha.4h:/5kvz qks*.c9ho o bai jyt 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 hornk 3/j7l7l1b,n u psexave/, aizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When vie/ 1kub7aap,xl/ sej n,vnl7e3wed 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 liesbrox*i4 -d d/iqj: pk, on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the indu*oir- 4xdqdp:,b j/i kced 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 t(tl1gmmx06 3m(sk )gujud l;with the north pole entering first. As the north pole km16mxdltu ;tm(g j)(sgl0u3 enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated r)))zzmzra 2ylx6 t+6j eeh6kat constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation +l26yr)zx amk6rj) ehz z6)teof 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 axis whkxh 7m/ s17gq0jkj mdvj)**vwz,ygr )ose direction can ms)1 j/k, * rwy0vx7v z7mgq)gj*kjhdbe 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.rjw+ jgj08r y)
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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 .7 s1d /lxm/rgfpamt)9by sa ;that 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 ap) v7-e./u* dapfo ogo magnetic 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 northwarda 5pl(r0uim +w at constant velocity through a magnetic field that points straight down. Make a statemeniu(r pl5w+ma 0t concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velnt4cng,xbv+ ; i 3i z+spaodl s9(:tp6ocity $\omega$ 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 transavnjpkhl3(;p 4 t-r1 zforms

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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.*be hskhhbvt3*4.j; ad1z ub 7 The frequency of thej;3heh 7bbzv bkhu4t1*.s*d a $emf$ 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 usevs87ml+9v odff 1na -adzrn ug 65sd4)d 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 devi0pwiryhs r8.sb* (pth o*0r-fce 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 thwpa4rgjcdw g- joyit2/ 70:n9e secondary coil contains more loops than the primary coil then it is a9 w pi4 d:cjor2tn jwygg/-07a

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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 the 9tu;p 9qffcg d 4685ccxrlc)psecondary coil then it 5cu4c9cpd8 69cp;f lg rq) txfis 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 ptk1glkc +05 utxdcq35ower 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 ciro 7qtyc;ydff8f65uk q3ap -5fx2f: mfcuit,

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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 i k7 )v6szmntd(n series to an ideal battery of constant terminal voltage. At thedn)zs 6v(tmk7 moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battuj rx,6jd:)hut+8g cjery of constant terminal voltage. 8 jrhd)jx+gctj: ,u u6At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductaheko0 37 apxk+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 inductance L a /mezpt*gr( ti6k,iyplh96 m7nd 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 gl7:7 i8 wgzamseries to a battery. The time constant for the circuita:zgm7w78 li g represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. nw-int( (txv5o i:zijr ,br,, The battery is suddenly removed from the circuit. The time constant for of the circxt( ,i( vb n- zitrno5jiw:r,,uit 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(wxqpw,6 np; + npnx3b 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 this circur0 b eg9/hvy/uit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cu cwsoelk . p(i.7iq*w3rrentow* i.li3ps.kwqc (7e

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor qsl+n1ejq52uxvd 0b dsg8lep 1 )(gv1when the frequency is l+qve1gg8s nv 5q1 0dle 1(2)dsujb xptripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across anj wkz+78p tq- 2qumf3m inductor is doubled, the inductive reactanc2 wf83 p-zmkjqq+mut 7e 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 approaches zero, the induzcx 4p.g3i1v jctive reactance of that cogpj.c3 z i41vxil

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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, the curr2im)kpzjusg4.n3wby d /9h7t entbdi/z .tj2)ky4 mwhns79ug3 p

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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 the fv51t .cawy.xfrequency is tripledfv .t1x aw.c5y?

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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 c0 :e -zbrh7mvbapacitive reae -0b7mzb: vhrctance 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 abz(o6ynf/ye9:t*f k voltages of the inductor and capacitor in a RLC s6b:yf9(zyt fnae k/* oeries 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 zj 5x2mqdb92 ois 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 circu0n0mtzkw50,o0uzflxze a)bj6ba x5 3it increases if R increases. When is t5z) zaxxb o w3a b50u0l0mekfz6 jt0,nhis 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. ql xrfb:. pi+p -fa*r9qi+,j t The 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 increasejwb(rpw+ wu*s,uoc 8 )s 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 circuit, ths)g(fx dxj5 uv /4qmnsif-6p;e resonant frequency o6d)sfmv4n fpx jg is -/qu(;x5f 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 anq,sq(m 19b.u pts2xyo 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 ocjpb4t;kozeqv(s xsvqf 83:(ys)j.,hcurs 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 fielxqs. v n 2(5tnaio k6gz1jg:+jd of 0.20 T. Find the magnetic flux through the loop whe2 n6nkijxg g1vaqjst(o5 z.+:n 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 )gq ie )wkyzml k pry+w(/1rfmvp /ru61sp,:4uniform magnetic field of 0.20 T. Find the (+q4k1) zv,w/g)siemrkwypr pry:1lu6f / pm magnetic flux 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 m is rot5ccrj+rp db9v 3gw. g+ating 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 at an angle rvgdg 59 3+cjrc w+pb.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 red ue7 t5yvv j5p5hl9b+q2ja3zduced 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 coilbx,qo 6 por(/b changes 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 framal c,v;6n-b.7wt bd. kxl9: 1cxofqbde 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, find the average value of the indu1xf .a7lq9;x:lcbtb6n -b,w.dcd ovk ced $emf$.

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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 andty)b*l.2om pn 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 ani8 :jnp2fww0o9s:-i ke/j b yxd 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 flies horizontally at a l;ov;z1e n sq-o2 rot-vocation where the downward component of the Earth's magnotv;- qos o-n v1e;zr2etic 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 ro.nxdvmd:vx v.7 0cj/ygc7x-vtates at a constant angular velocity of 2.0 rad/s about a vertical axis ccvdx .dx :x7m/0-njg.vvv y7through 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 a o hs:lvd*),uend 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 1kgvon76 r/)3njq(uug 00 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. Eacls-t 8de :uu1mksd pn* *4lrk7h loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.3sr lm*7ldun : tkdp1*eks- 8u40 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 tuxvy o hxtiub 5p0s/ey64y *m12rns 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 construct a simple AC generator witb9srffmim, 097d 6m pth an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If tr9p,6 sfift7mdmb0 9 mhe 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 generat 2yj;u ohd, vlv yelas3g5*j18or 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 6.00 W. The motor operidu91*oa:1yrvj znx 0 y;rr,wjip6)lates 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 mot 5xjw6f n )2 +dezbnv+rh7*zguor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it gz 52rb w+u7n*ejnxgv6+fz hd)enerates 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 powec8h s n64xfzmxy h z6m5x6b z3e+6z7 y:/jrotir supply. The operating current is 1.0 A. What is the start-up current? z+64zxm68h5 z6x/im 3to y 76f bnyzchsjrx:e

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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 cok m 6 (k47s-3qe)b,dcfip ovyknnected to a 24-V power supply. The operating csk (qm)k37bvy4fkip- dc6o e ,urrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W e-f*4/infi xv -3ww/ iyxwbw9is connected to a 24-V power supply. The operating current is 1.0 A at full speed. iw 9 -ybv3/wx4ff/iwinw x*-eWhat 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 ace ru*0fcwt6+t0* fwreduce 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 transformg0jg g )qap8u3er causes 14 A to flow in the secondary. How many turns are in the sec8 qa0ggjgp 3u)ondary?

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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 mabyh yie0x.cpuxg;)n2wz. 8w, ny turns are necessary in a 110-V primary if the 24-V secondary has ).;xg,ww 2xz0u.yn c 8 ibphey100 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 uqf3 frr4sifsn :k8. 7coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current i7u ifr ns8.4fsf:qr3 kn 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 pri dq69gbc ,5z-atasut*mary of a transformer. Assuming 100% efficiency, how many amps a qgbu,*9- cat56adsz tt 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 tranvf t 0aa3+bx9 3nr-svcr7ai b2sformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drab3 v3t9xna0 +i raf7b-ras 2vcw?

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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 primaixh 7 /t.)tv3..; ;i9ba bgwzyjdvcd xvhwi, 9ry coil and 300 turns on its secondaryy jwhw7v., 9g)h;/ xtbv t3ibvx;i d9dzca..i coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secog. /vwjlq(u9ot o tiv0p99*s7gt g l7jndary coil. If 120 V at 2.0 A is applied to the primary, p*iuljsog 0v 9o/9(qvjt t.tg9 l7w7gwhat 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 20*gjw* ;:ti5dkxa2xm z/r mok (0 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary toaxti ;r mw dk*z:(2/j5kxg*m o 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 tu9k(z ,agzwom:oc x b2:rns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can e29zxwo:bk a(g:,zc omxpect 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 5la +3exb q od-/exa-uhas 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fricq-l -ad x/e5xebaou+3tional 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 currenc6k;a*/ pu qbtaa76mj t at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throu6t* 6/amq;bu7 k jcpaagh 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 curo90:wd3t;nk3 pdbe hzh 9bq: kb7q ga1rent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentq dg:1twd e k3k9bn h:bp q;7zha9o0b3age 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 stepp 7wd,d o pjjeq.-kn-spbg+e-9ed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped ub nqse-p7p kdwe-.gj,9-d+ ojp.

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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 mj:vjzu*q.k) 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 transformer with a turns k ujjz)*v.qm :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 m) :ybrdkg1 d;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 transformer with a turns ratio of 100:1. What percentage of the original energy is lost when)d r :bm1;kdyg 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 m l76y1ht 0dyupower would be lost 7tydy16muhl 0if the power were 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 to bew*j/r26,ido s:olm 8o5 acbw z transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the origina, lzoc/im2a:r6 ww*o ojsd5 8bl 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 q6wt hux6 -.ihmuch energy is stored in the coil's magnetictu6i x6h. qh-w 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 mtg6djjg8w( x:lt2cl6q.w d0a 6.0-W resistor and an 18-H inductor. What is this circui:x8ld(ttdj6 q2cg 06w gwjm.lt'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 an46,ffu97 ltrihs/9 o iyl6eabn3v 5rk AC circuit 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 outlet4qau7p7shp7 h . 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. Whaf2r k/r7r bxi:w-cxo 0t is the resistance of the la0bc /rr72orw-ifk: xxmp?

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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 f tstls41jll/j8x1h; supply. What is the peak current through the resist;fj1ltl xls s1/j8h 4tor?

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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 connectep-/ k( fi+uwl;*+w xaw1flpued to a 120-V ac power supply. What is the power dissipatee+a/f;kll(+w*wi1fu uxp-w pd 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 rf691zl5 ; ts j0jnywctngp 6r5esistor 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 resiste -rl-hn a x1)d8jjaz,or 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-Wa eiut0/a/h ,t 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 atlg4 tv16 c qm;7ies7n.fwt -tu 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 at 1000 Hz?;dgjr ufr7n9 7phfqww2lzdc/+),- 3 mlr6if a

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W 9n9ek mixrlsth (y ;w+r;1 ks,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 ofd,053ucrf4d6c,hwu ;o fxcgf 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 frpd )6tjsfc1 3hequency of 20 kHz is appfdpj )ts1c63 hlied 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 2.50-mH coil due to a 26q td)4z zy96r d ypbv:i7epu110-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 k o-tzunj (.bk)pb odkuls6tp,:z/1)a Hz?

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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 need ;rbq.xx i1o*cksh 41qed to have 50 W of 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-m:v;5f7 z0 atw3t:i+x fdhui xf gl,p*lF 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 reac lc1hl.f +wjj1( keys2tance of a 0.010-mF capacitor be 100 W?1 ck 1.+ j2syfl(ehjwl

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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 r(jg tm(*o; pq+4vjs2+xzt mm 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 0ccg* o 0 ozc4l9rin/g12.0 W resistance, 15.0 W inductive re*o9c/n r gio 04cglcz0actance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resis .4l fnm mr-44b)uu0gfk;n bektor, 20-mH coil, and 1.0-mF cklu;4m) nmgek0ubf n4-rf 4b.apacitor 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-mHx p+ bpapc zqd 92z;3ilz01b8 :7tpitr coil, and 1.0-mF capacitor are connected in ltbqb 7iip9 pcx 2z0 81;z3p+rt:dzap 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 apk+7pu t9; g1ey:u/ydc ky0gf 20-mH inductor, what is the impedance au0; p 1g egkc:t79fyyk/+ydput 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 6 m/+in3dai )qvdujm+(q *omlinductor, what is the phase angle at 1* did3)/jqm aio l6n+m( m+vuq000 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 nee62 qw7)j j*rwrj5l.l 2o 3izmoz-qhgwded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance 2qr hj l .zi)z3q6jw m2*owljwo7g r-5of 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*+j(3 (wp y n6fkg) m*dbakrjs is needed in series with a 100-W resistor an ba)jwk(*nm+fykdg 6rs*j(p 3d 15-mH 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 inductbzfs8e) +e. xtor at 5000 Hz for a total impedance of 4sbz+te 8) x.fe0000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor a/ vbvbu6 .5ukrt 1.0-MHz for a total impedance of 150 kW?6/v.u ukbbvr 5

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacib5mr9nb7e y2i tor. What is the impedance at 1000 Hzmrby ie9n 527b?

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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 uyo vha2x;1 (twith a 10-mF capacitor at 1.0 kHz for a total impedance of 4y vh;ota(2 1ux5 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-mF capacitor at 1.0 kHz for a ,. (kt8ivo0a3 t5vj npuuyd.i;*zgn ephase angl; i*(. u a v zv5o8,jiekpy.03ndugttne of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a to(xs+ ;)gczozes7 z7xytal impedancexcg zs7;oe)x+(zz7 ys 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 4bj4 pce.xvtt qs2p3em n:(3fcapacitor at 120 Hz. What is the phase angljx 2e3bvsp4nefq m43tct (. p:e?

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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 1.zxx (q3e+ 6gvc0-mF capacitor are conxvz 3qc xe(6+gnected 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 cap ct./r; ccej;vacitor, and a 0.350-H inductor. The c /c;ccj.vte;r ircuit is connected to 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 capacitit;d/vz2q -l9v3d1m9lza ovdqve reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to9 v;z-/al1qqovtd 3md9 l2z dv a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-- w3p ku5,dyymW resistor, a 10-mF capacitor, and a 0.45-H inductor, u -ymk5pwdy,3 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 serie*,-oin s3lurm/ojb . ls with a 500-W resistor for a phase angle of .m* ,/oounb lr-ji3sl$40^{\circ}$ 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 e/ec8evbn( +0xa+gcvW, L = 200-mH, C = 10.0 mF. At what frequency should 0 + +xnc (geaev8veb/cthe circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit w/jhz gw)ud1:np 16c c+2q swxj y0cz6rith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancu w1:jp66s zhdc+1)q 0gr2jx cnwzy /ce, 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 circuitc:ok3y rp t al/fj-d)5a4xzi 0 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 resista:i0 ij, nz(jiance of 30 W. What is the power ,(ii0 zjnj :aifactor?

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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 contacyn/ 57n/t cm5vr4ki qining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to cyr5//5qn km7cntv4i 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 capacitzm dsa*0d z6w(or and a 15-mH coil in series?z0d(6sw* zdma

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant fre1 .xnwu.5 jazequency of 10 kHz?z 15uewa jx..n

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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 inm hnb29 6tknr( series with a 3.7-mH inductor for a resonant frequencyr hm(nt2nkb69 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 sh7)whdfcttc 6 ) ua16.xbga4 yeries with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 100w1)btgxtu4ya)hd 7 c6a c h.6f0 Hz?

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