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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux ftr 1s4g;:mpm 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 st nnwh;5 jk+r:o hl;rhi48v n+wates 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 l1ar67di*a1d pdzhq1 i 3bd yvx35:rfwire in a coil produces what kind of change on thdxrv 3pfazddla1d6bq3i71y i: * 5r1he 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 throug; + h9cc(xom 9vri)stwh a loop of wire produces what kind of chho+wc i99 mcvxrt;s)(ange 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 kind of change on ti-/k igd 3w(nthe indugn ki -d/(w3ticed $emf$, 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 cdflv3yn4/4lp +w4n. da-ogr 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 current in a conductor will( p,trd z+ wxe 606rr.st*cfkf be that which tends to produce whic +trdprffe, cwr0zk6st6* (x. h 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 horizontz*y(-:rkwqwol ;c0kr3 y nq6z 1. cemaal table. A bar magnet is held above its center with its north pole pointing down. The (c.0:r erkwzcay3zwm;-k1ln o*yqq 6stationary 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 bp lfalf .q/g :oe++5zon a 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 viewed from abov:f bfl.l eqzp a5+o/g+e)

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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 -/ammr wp q 6 :.ew(zo)wf:qfx v99anrwhere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is then vrwzap)/ffw9e-xqma(: 6 w.ro9m:q sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnem:bb-.ehrz h) tic field vector points straight up. Thezm -bhh)b. :re magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in ap0f )dm)+srp o/afi+( )hctki region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the ind0fpi/+)sd(hcao )p km ir)tf+uced 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-increaovuhw8//+dt a0gs8 wic). vmqm * 2*1qhsvenjsing current northward. Two coils of wire lie flat on the table, one on eithere 2m1so08+cdth./ m)**qgj/v qi u8 shvawvn w 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 entering firsmbisi /7f4w. bu5r b1zczs/ q02l-xmxt. As the north pole enters the wire, the induced current will be (as viewed from abb q rui-bzms4/ 51sbxwmz7f/lx0c i2 .ove)

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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 constant angulz luh: 0ifn/8wl/m:w02 ccgkoar speed about an axis whose direction can be varied. 0l/ lnikw:cw cf2:z0g uho/8mIn 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 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 axi.x6s4,d2y-pt0z be gouh2yzu s whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation oftd ehs o6b. zu4 2y2yxu0zpg-, 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.hy 0r3/;( dmpyicn4m9 daa.f f
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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 a 9nla y/cu07bjn $emf$ 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 magnetic1ml z(x,wvxq ycw 7.+s 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 (orientxd)m d pedy134ed in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concern)31m yxddd 4peing 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 rotatesacx+v8yy,ludy:u 2p b6zc:.u at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transform(lf9hiqg+r wbwr:- 6ns

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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 freque wae5)ly:5sy u3j-dxa ncy of the:)awd-lyj y asu 35ex5 $emf$ 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 usahyk.sv6ta (g a8 d4-ged 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 *nk9tzmf,8s)gbad3w*t b :ghthat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more looph3(yy ebqgv*4.qar q )s than the primary coil theqg(evy*)qqb3h ry .a4n it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil wk(:dy:j qapp) ua0s 8contains more loops than the secondary coil then it is u :aws) ydpa8j0:pkq( 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 inpug e*,02 na:qd vn7:px6au tehft

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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 c nr *10xwf4oxetmvz/oa f0k99ircuit,

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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 inductorg+5 u1zcjl1hm an5nv8c)g;q u lfty;d 3y-q1d are connected in series to an ideal battery of constant terminal voltad +5u n;11;)yhzm3-aj 8lc5 q1 vnldgtugyqfcge. At the 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 a;y,yksne *5ue n ideal battery of consta*;sn5yu e k,eynt terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to xj /zmg22f2lf 54cfiwuib;(yan $emf$. 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-t p eq oi5w57uq5zr)f 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 induc0aeqsqx)- o y:*gv(y ssypo (;tor are connected in series to a battery. The time constant for the circuit represents the time required for the os oe;0q)y:ss((yg-xq*yvp acurrent 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 batte: bvpfkk/,qfg +d52 ,ovm th5ury. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease / p,hutk25:vodfbv m+f5,qg k 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 71c2;aynxvv i3 oj; bgsame 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.m lri 6-s/made/ wb12k 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 supply. In this circuit, the cur(qk lswml h2uxo,z y5gs/ j9 oi/tc*,/ren2iu5x/ h/ms z9/c *(,,yo gjlqkt wlsot

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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 tpz*2aa2u1j .o(t n 4 vi 8t1sepvxq8achanges by what factor when the frequency is tripledxotu4t.p2*12 s(a1 a8evjt8nq zi vpa?

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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 v3l+)6;h 3 it7p uummtbiw- 6qboe6 eq(s*jgotoltage across an inductor is doubled, the inductive reactance of that eu3;gs3qij hmq6b) tl t*bp+ wo- i6t mu7eo6(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 induc+p+ c*xdwl k8 9n7xroctc+x8n+*9pdk wo l7 rcxive 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, the cur.;+ z- mci nu1 ifi(gkdjrf8q;rent +q;gk-jnzrf8 .f icu;dii1m(

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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 fs0c))lirn k.h3 biru e)(ihb :actor when the frequency is tripledc)shh:(r kin)ri e) 0.lb ubi3?

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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 q,ra0 gr jop/e,- hrmbhm:o(( approaches zero, the capacitive reactance :h0jogamrmeor,,/hbr - q( (pof 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 inductor and capacitor t n74g+eo 8 ybry5x8+bg*yr lrin a RLC series cirrg5 + gor e*y47b8tb+8n yyxlrcuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as yim3g keg(9ngw 0vp *6 an--sw$\cos M = R/Z$, 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 t uy9yf5p+tut 4he circuit increases if R increases. When isyuytpftu 94 +5 this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit.cr 63x vbp5rm7 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. T:fpe;x c; 1n2b7 rpjc-/bo0jxg1tnv fhe impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in q1 r5:4 y ;hc2 cahtsbzcd.-wran LRC series circuit, the resonawacc1bc h5.r4zhdys; :-r 2t qnt 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 circui vq4j48:qwr qot 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-z9qk z,v20j i cp0s,rr:k7ob ltej l+ circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20wf5 fj: ncsr-0 T. Find the magnetic5wjf:frn sc 0- flux 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 uniform magnetic +*b1y7ix/mkn, ckwx tc)0ppd field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vec1 c wki0nkc/,+dx y*px7tm)pbtor 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 radoa nnjh )/x+3 6ei-srjius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find thehn6j/3rjsx+ iaon) e- magnetic flux through the loop when the plane 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 y66: y.mndjyu2jd .k eadjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes f/cuf i u2f-o:xo g*er9rom $4.0 \times 10^{-5} \; Wb$ 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 tjbm l:9 740klp e6tsnourns of wire on a square frame with sides 18 cm. A unif 60okep n 9tl:s4m7bljorm 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 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 ar6;n aq.h-fgg zea 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 andcx4 j4+w; be/n,rq lqf 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 wrldgm6m4 7nm7vyrua.ru/u6 5 ing span of 60 m flies horizontally at a location where the downward component of7vm7.md4 a ml5un yr6gu6/rur 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 .nw:* n bb/tyl2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through ont*n y nb.b:/wle 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 hayt3:em s24jfjsv(x+:czkk- iil 25y ms 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 1 9c g2 t*ih0pf*wckml,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 oyqw 3ide(tm1sc77 c2 wn its armature. Each loop is 12 cm long and 8 cm wide. The armature rcwq7eyt32dw1(c m 7siotates 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 consist /9;ltls s1cavbpn1j2fv5i*rs 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 construct a simple AC generator with an outpusq9:-gxoi8g3ut/ 4mwozr 423xfzut pucr1 w;t of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the ar8xf/i: swqutxu c2gm4 43139ruzoo p w-tr;gz ea 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 0s b ngmhnt s4k74z )zl7dkt4;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 *p uu80k8uonu 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 6.00fyz6 (ds5w-hf W. The motor operates on 120 V AC, a6hdw f(-zsyf 5nd when running 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 res 5yzq (ucv)z9histance 6.0 W is connected to a 24-V power supply. The opera)5z v9qyhu zc(ting current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 Wkf t7phtnpt*, :jrhp8na9j83 is connected to a 24-V power supply. The operating current is 1.0 A atpknf7r 9 tpnthh, tj:8j 8p*3a 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 rk;dgc .err4ex1o - m;lesistance 6.0 W is connected to a 24-V power supply. The oe 1r ;logm;re-xc k.d4perating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a prilojgktk5a:v/ p *yg4qd15 )cymary 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 transformer causes 14 A to flow in the secogs l3gz q1u cp kywyk6h)/*x63 mg5tg3ndary. How many turns are in the sec/6365gx yskkphg 3 q1g*yc3)zmltwg u 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 many turns are necessary in a 110-V primary if the 24-b,lm+ivca . rc* dxnyb+fr)7a6; 3od iV seca7*3 +nxric dc+o;,r )dylb i6abm.vfondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondaeo :.ka**iykk 1ehi 0sh a;r2try coil. If the current in the second*ih2ey1rkk eh:.t*aios ; ak0ary 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 izh-twi *l 8uk4n the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in -lkuh8w4t z*i 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 trank(/tot4etq snjvj;7:ou, , is sformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primaryqj so,u(iet7onkv tj4 t,/:; s 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 iznjqfji cr 9q0d , 7*iheqf;:0b5ily0ts primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A; 0q rj f*e0 nq7b:y,0hcifdzl59jq ii 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 p fwrucc: .z2d/-36rw1u bkd ztrimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is p w 2fwudc-r:dr6czuzk31/ .tbresent 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 /g.wh92ekvr;/l5f xtdgi q36m .vtev secondary has 200 turns. If the input current at k..2t/ei 9x6g ;lvwm 3trv5/ egdvhfq the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its se2 doqvxgo,6s+ condary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary ,2vo o6dxqsg+ 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 seco u47u r 2fnkloc*7sg)ondary has 200 turns. If the power input to the primary is 100 W, we can expect the po *7ngsuo )47 luorcf2kwer 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 12tjgu ( 2 t+jxe(.,3 ea+x 5whuqci.amr0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tot,r(q tch(ua xt ueax2g.+ we+m5 ij.j3al resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The volta*5 ab ms5:jno9p; jfr0wlt *tlge is usually stepped up to 4500 V bl* j:r5os b l;amp9jtntw*50f y a transformer and transmitted through a power line 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)qe8xkt1 i r4g 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and tr) 1g4iektq8 xransmitted 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 long has a total resist,9h/*y qkncv2v /h)apmd7 r)xhj 3idvance 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 py dp vv/)3)ak/hnj*x,chh7 2dr9qim vercentage 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 totpgtbvcl55l 0v)90e h swyh 4x1al 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 ofvh e0yl155bhgx)p 4cvsl9t 0 w 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 muci80p. 7xq 4*wzu llpws*p svi7h less power would be lost if the powe*u*p8 7qlpi7xl p.4vwz isw0s r 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 20wc u ,qtld2z44q23azl A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0q 2ql3l ,4ud tc4z2zaw.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. iuc 82ool;ul/:jb bar.p 4b9ex tw+,vHow much energy is stored in the coil'wbxe8jb l .,24 oviuuo/:9;t+pr albcs 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-Wc qgoylq3snrxx 2, z;(hx;9e* resistor and an 18-H inductor. What is this circuit;ln2zc er9q;x g,xy* s3qxoh('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 circulg.bjns x5p5(t47bj;bn q*ewit 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. 4cv bpfyq1aktdd**g 2u( , gc1What 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. Wi. 1r/rqkcebut .b ; de3sw7 ;x8dcf go1c:q5shat is the resistance of the lamp. 1 .i8k e;cfwcsbr:sg;cbd7u/qq3txo re 1 d5?

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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-Vp/ cq/p:wq r2htz. 0uq ac power supply. What is the peak current tz qru/.tqwqphcp2 0/: hrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac gng (wv j1gby xm827b0q*7h0wt-g8ifpgq if7 power supply. What is the power dissipat80hv12 t-bgx *mf7nfqgy7gjqii7(g bg0w8wp ed 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 resistor i79nncro+vm:pewdo , mx;/ 3n xs $I = 0.80 \sin (240 t)$. 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 508q9l * yk31isdltb3gm-o5qwe-W resistor 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 /kr(c+ nsdlm,+ay+yxqkc5 11l obj 1p50-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 reactancow,h:nuh)y4c;xo5thu i 2xf*r9baq 4e of a 1.0-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 inductivjvipr.h clij/kx:,bp ) 56mi4e reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0/8 c y9 /4 tg*ixrjod1sayckl* 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 aww oq5belu0k- 6-jf t6t 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 fre /2gizir .m fq)z ofxabp/;*8aquency of 20 kHz is2mi/af g/pxo.*r)baz;if8 qz 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 throughuz(h(wfj86u5u; ydm wntq7 ,d a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF cyq2/zfih4iw 68,ldd m apacitor 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 -iw;;+ f.p2win 2fuzj*zui zk 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-mF capacitor have a reactance of cd y,ra5y728kn 6rq au1200 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 0.010-mF cappj e) t8w1)njlavv+d7ze +jo6acitor be 100 W e+pe +v 6 j7tlndjaw)v81)joz?

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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 3tm 1-pwnplmjg/ek,3 zg 4x3r5.0 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 resis8q 3a+hmtk5qltance, 15.0 W inductive reactance, and 10.0 W capalqtkq3 ham 5+8citive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, vk jk-,a xf12cand 1.0-mF capacitor a fk v,j2axck-1re 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 c,6),kwvk8rr6xxu*mhsva:w e 5 no7ob c/wu )coil, and 1.0-mF capaciwx) w*rkrmb /),nwhv7e:6 cvs u,c58 ko6 xuaotor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor,7; 4d xzfzd52pr8yha j what is the i2f y 8d7d4;zrjh az5xpmpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH in dvnl/n -r )2*ie-mffmductor, what is the pm/ -meifv r-dl nf*n2)hase 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 cigf uzthf -ov,/pht6t) 0q,;pxrcuit with a 20-mH coil and 1.0-mF capacitor for a total impedazpt;,tuv0tf6p g hh ,x-qfo) /nce 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 is needed in series with a 100-pv5k1vnz( 9 d6qcx +fcxc4w+lW resistor and 15-mH coil to get a total impedancc 1 zvwq9+l 4kd5xxfcv+c( n6pe 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 pu3vjqx uhblk94z/v *:pt in series with a 450-mH inductor at 5000 Hz for a total impedlv :b*qkv4p/3uj hxz9ance 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 9egovt-wfsckup81s/ (r wb5 3series with a 100-kW resistor at 1.0-MHz for a total impedance s13cpwr fkvtwg sb5u-9eo(8/ 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 cc x1)h (zkea5yonnected in series with a 20-mF capacitor. What is the impedax zcy)h15(ekance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.bc 98p47 wqnjf0 kHz for a total impeda7 84wpbjqf n9cnce 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 neede,*/ kh jkpedmpf(ib26 d in series with a 10-mF capacitor at 1.0 kHz for a phase ep,6 b*k2pjkd(i/m fhangle 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 (d e0 od+srulz* m:ka7in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 W 7kl szd0:a(deor m+*u?

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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 capact fgm3vn 0b,* rol4.pqitor at 120 Hz. What is the pharn*l,3o0g.pt4 fqm bv se angle?

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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, augci-+f , wux7btgelp g-p ,(:nd 1.0-mF cit7u+ -eu-p(:,g g ,b fwxlcpgapacitor 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 1 0qagt6nq9e: j00-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circ ag:0qet9qn j6uit?

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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, an-0: ll w ac)0e.kfl16wz -,c)mgtcjkhci rz+jd an inductor of inductive reactance cl.6m 0,zhwcl)e 0cj -+lrw: cktjf1k-ia z)g 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contahozwzq2ji 2sll ):gj) rb6(h +ining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power l( 2w2)ji lgjhz:zsr+qb )o6h 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 ;7z/vyvsqmlzq5oz/z ) gs6 5dq*g)rywith a 500-W resistor for a phase angle omr6qo glg55q 7/s;))z z*yysz q zv/dvf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mFc1gy,a f,y d1x 5wq5z3 g-iulo. At what frequency should the circuit be driven in order to have maximum powerd1xaywc5 oqu,g5l ,yif-gz1 3 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 with 12.0 W resistance, 1,2+tcco :frih 5.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit ii2tf, cro hc+:s 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 r5ruqgi l0f 6vqz/n9x av:1 g.circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance ofh1/80nbbw fgkqw j/7m 30 W. What is the power fam b/7w0n8bjfg/w q1khctor?

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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 tq. jjc2h68 -fjg1q cje,too- for a series RLC circuit containing a 50-W resistor, a 10-mF capacit-2jcq6oetogjh . tfjcj18 -, qor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and +9tco.kr1xo wd a*s n-a 15-mH coil in series?ck.+oo-w 91rsax*n dt

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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 freqpv3gtn qt.1qbw. +af(uency agqv 3n(bq+f1. tt. pwof 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series wug exji:co( *2ith a 3.7-mH inductor for a resonant frequency of 1oug(j cei2*:x 000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be plae h8 w3o . 8orq1iinxczwj2h80ced in series with a 30-W resistor and a 40-mH coil if the cwj.ri oq23ie8wz 0h8x1hon8 resonant frequency of the circuit is to be 1000 Hz?

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