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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 h99codl)uwel)2 -jx 3s eb7d k;nk n3xmh6,j zare 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 induction states that7t16 zr: ah(gu.7+nsn kz ljdz 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 x+j.q9 -0s fkjwm2dryj eyw6 q-;y 1qdwire in a coil produces what kind of change on the induced k je1+q9r-2j ywwdjyf xq s;q.m6 -0dy$emf$, 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;/vs q pemcpur)smw94;u3qi, produces what kii3m/ sspemv;pw4crq; q,9u u)nd of 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 orge,acaj* yuh43i h il8d0c-cdeyx,) ;u :y )jf wire produces what kind of change on the indu)iirj 4u0l,yaa e:)3j, c*dhd-y;xcyec 8guhced $emf$, 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 frcg;90ig 0 vpym/01 b/xyowb ivom a magnetic field 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, :byx s-k:v rd1j0naqj 9+2icgthe direction of an induced current in a conductor will be that which tends to produce which of the followina9irc : :xgb+yn1jkd-2qj vs0g 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. ip;. y vt-x-howl)k a 6 (55i)y voq+wcvadj8eA bar magnet is held above its center with its north pole pointing down. The stationary magnet ind yock( ;65ahotvd- ix-ei8v. ja+ypw)l5 qvw)uces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held5qz;l zaxr +-t above its center with its north pole pointing down, and released. As z 5+q;larz-xtit 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 top in d3pg ihyi,)s70* p 1jj.un,4kwwgb yna region where the magnetic field vector points straight up. The magnetic g.di4n*p0yusykb 73jp1g w ,wn,)hji field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a w plv u7y;7 )bobcts7+gdz*+ dregion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induce+7yoz)c;vsb7ldbutg*p w 7d+ d 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 h l4 izeo5/+cj 9tynx,sa19almorizontal table top in a region where the magnetic field points strca t4 1m9e o s+y9nz,jaxl/i5laight 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 table and carries an97.3s c,bm2i7 n s y;plphtzdd 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 induced current ci.ypnptlc3zh7b i dm,7d ;s2 s9rcles

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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 throbx 65ir i;uoe2ugh a loop of wire with the north pole entering first. As the north pole enters the wire,iui5b;e 6oxr2 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/c*;nn9s p4aaybh. mf 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 of the loop's axis of rotatio h9y nacn4bmp;f*/.a sn 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 who6nrbcduy 48 (rse direction 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 ro64b (ynr u8crdtation 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.vok2o ea 6xzqq/2 ru1pkmv06g :n6w)l
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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 an ahyynq5x od4s2 ov fj+5 t0hvv*9p,c-$emf$ 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 fieled6 ih*)quue1jnd3f; y kb9li d*y*6o d. 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 northwarv9d :jci8j m (,h* -d8ge(cvhymgmh4 jd at constant velocity through aji c( vh,m(ygdj *gd9mm88h4v- : hjce magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocjfao1-sw(.p7f,w a6 hb6sfboity $\omega$ 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 transformsmo)-yt 2g.j;qy vsiyb*,hd8v b 9kt 0b

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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 secondd uhcv87 2d vpc+ne*zu(s u*r8. The frequency of t7*v8 pu* zdc2e+hc d (uv8srunhe $emf$ 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 usecpn8w59 ndha 79t1cs- noo0b od 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 device6x 17ir)r 7li ezad6oq that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary co -+j6qy 9 to.2bhzhhjtil contains more loops than the primary coil t.h+2q yo tt96zhj- bjhhen 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 c osa.9 be1/oswoil contains more loops than the secondary coil then it isows1e/. 9osab 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 p bmg65q-zrx2-b0 pvwifs(tk .ower 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,00.tshap z 9yp

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideap2z3wiqy +or7i8 mgs-l battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acroszw8+poy3-si7 rqgi 2 ms 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 conne 5 gv1qu3ogi 3k3)mleucted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across tho v35gue3 3qilkg1mu)e 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 aah1 x*2yic.5 s se9d)o0uwcian $emf$. 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 coa2mr 1xn- qfyi(-tvv8nnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time +07 onofi+b- t0lc7wljg2dy 7lri 0lw constant for the circuit repreibl 0- w i +t72w0ofn oy+g0lr77jldlcsents 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 con;.pkv q1f39dglte *pv nected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the c d.f19;g*plt 3 pevvqkurrent to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exc:sosh )zr )a7f,h*icfept:

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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 circuit, the currixako sl8 d 987i;j lq2mlgh51ent

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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 syh5/zdg-t 0tac 1n5xcurrentgy5 /hxt d0zats-c5n1

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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 zrdh tlof9*5t- ty)sr3aw.-g:q e3crc ugw9+changes by what factor when the frequency is triucw)y gf w:tgst h-arr3+z5cd*.re 9 -qol93tpled?

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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 thyjq.mxto2g(k(x ; p*xe AC voltage across an inductor is doubled, the inductive reactance of that inductor;y2x(xxgokpq mt.j(*

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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, th:.gr zdvel*e: w.dsi7e inductive reacta gd v*:.lwi.e:e 7srzdnce 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 ACz 25fox rl/omu1;vc q* power supply. In this circuit, the curreo mvu*o5;lfqc2 1x/rznt

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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 cir./yc e;vxl1b3cfz:ht cuit changes by what factor when the frequencycy vcbf:t ex;./ 3z1lh 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 *rfjb0l3qh;fy) hjoc see4)- the AC voltage across a capacitor approaches zero, the capacitive rea0jl* e y-fhfj;cb)o3e4hsqr) ctance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor anwpfo0gu .x u6sroks5g,66 n0nd capacitor in a RLC sgwu6.f6 o0 50x,sn nug6k sopreries 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 ciro5- romhify*v9 .yut w2o*6 udcuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of ty. ftkdt60v h/j4n,oghe circuit increases if R increases. When is this statj,04ovf n gh/.6 tdtkyement 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 impi3w *5b n8s ddoy+ 9 3m+9sos+nthcftsedance 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. Thittje29u -t n,e 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 an LRC series circuit, vbiag(jxw ()t n .m25vthe resonant frequency of that circui tb(.)a(xmv ni g2j5vwt will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applieqkr0mtmc r00 wu/ *,shd 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 cir6c, g(oo )rop/6 chyv1 *guohrcuit 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 o21fl/a5iq nkxf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecto/ n521l fqxiakr 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 uniformm08 g ++bt tb 3p(djyfga)ri,t 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 peg)b a8fj tp i3+mb(,r0+yttg drpendicular.

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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 0.1z9pll/vt,3sh3i*k xq a f1tg /0 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 at 9 / t13lv*tg3hz fqak s/pl,ixan 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 -:; 0jczvd1 svtp qn(hh+0kgwof an adjustable 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 coiliw,(if1fare90.dq(2q /d 3 p vxx wemi 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 oq:ckoj z5tr80pzg5 1nno1m g iq4+2b qf wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniforpg1n i4b8z q grzom:n0o1 ktc+552qqj mly 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 a+ vneiuw bjr,0 nr3cojk::; y:n 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 anb kck7(b6gh6 dx t7y;nd 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 bc-q ufe6)jv)r1l9zpwco- ha6 8x1lcflies horizontally at a location where the downward component of the Earth's ma1l)apv 6l9c bj8r-e)1 6qw uoccxfhz- gnetic 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 angul 0sylvxqi q8fimz//(4ar velocity of 2.08 /xq ifmiv40zq(/sl y rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area .lzax,l;okd t1 h.)f lof $0.25 \; m^{2}$. 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 gu/ 9-: xcgfkiarea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cmd5)t a,ub8 bbb long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in b,t8d5)babbu a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tur,fcg3xfbc;9-jo;0 wlmau. ozns 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 output of 123obb op8qs )w: V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If thboo38ps )bqw :e 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.kc64v/y b3rcxqvptp jwm9. f 9 bjd82 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.y oqbzc -f7q,8 The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on 1n56bm98 tj8 lhqdani2ue-bn6i1(hi i 2ablj5nu2b(ih6d 8 himei-18 nqin 6 9t0 V AC, and 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 resistance 6.0 W is connected to a 24-V powelc b/wg-juw ;ztm+-f -r supply. The operatinggw/l- bmw +fu j-c;z-t 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 W i.6ww0vh+w; k5x/v ggbhj8 d vts connected to a 24-V power supply. The operating current is 1.0 A at full speed. W;btkv 0xwg+ h5vh.dg6ww/ vj 8hat 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 i p;jcyt,+tc* ofp+r -ds connected to a 24-V power supply. The operating current is 1.0 A at full speed. +j f;d*ccot ry,-ppt+ 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 re 17r(15fze xe416 jormagpw +qwqra*qduce 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 transformer causes 14 A to fbw3 :5rka-t z0(stc zfbd (y+hqzti7,low in the secondary. How many turns are in the si:a(,tbwzct q+z htz0 ky r 3s(b-7d5fecondary?

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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( urdxknpo 8o *0n,t1f if the 24-V secondary has 100 to,u*nn 1(dtf0o k rxp8urns?

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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-turnxl:q3x t sk4+f8q 4laii8i2qa secondary coil. If the current in the secondary is 3.0 A, what is the current in tx +lf44t ka:ixia8qs3ql8 q2ihe 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 primary of a transfort f.)l6:a rffimer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondari rlf f:.at6f)y?

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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 a1j 1n2 h0ed/erlqn 8pbqs2i/:pyb7b 10.0 mA. The primary coil operates on 120 V. What does the pri /1p2nrdheab0l 7by:1q jnpse8q i2 /bmary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary 9)yj+j,f krc,:th9see;b kmtcoil and 300 turns on its secondary coil. If 120 V at 2.0 A ih ets9,yt):j;j c,rf mk +9kebs 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 turn 2jcdnk uzua8q8l1hw,pyz 57,s on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appliekj, z7u8zq82wu5 c lhyd ,a1npd 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 has 100 turns and its secondary has 2tn,2an13 ubn t00 turns. If the it,3nnb2nat u1 nput current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and i/)fgiio d0+omx/witdnd;1au/gd9 d 9p c7jq/ts secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volqu9x /idwgg+/d0nd im fpct oo /ja;9/17idd)tage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Ifx6kv ll1,pdmyie ,b le )(0bd6 ctli85 the power input to v8 1ldm0b(5e6li,y cdi lkx6bt l,p)e the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current atb /1sy lu5mfi3,zsde(6p)bx u 120 V. The voltage is usually stepped up l(up s/ze13d ibb6uf,s)m5yx to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the 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 1: s)bql)ec8rmj9ui-d 20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 q mruij9 b-) s8dlce:)W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Tsl,f0.l 5vcqu he voltage is usually stepped up to 4500 V by a transformer and transmittefl q.5usc0 v,ld 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 q/j-6ip2ex0m-: e c qwrj hjstix7h+ )long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percwx+e2: e- q0s-jch hqjxt)/ mi7irp6 jentage 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 51 wrf*sh7.s:hbb ft uu *ip4h rc.1k.t0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss duf1cfu. ph*hui ws .1ht:tr7kb .b4*sr e to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. qt (/um,).t8zo ls8bdusj2rnHow much less power would be lost if the power were transmitted at o)(8m.2u bus ,/8tlqzdr j tsn3000 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 be tr(eg zgm+--f klpabn99ansmitted on a line with +lnm9b f9 pg kz(g--aeresistance 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 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 m9ben4*z6ld bwl kx5p 8uch energy is stored in the coil'68b*9ln5xld kwp ze b4s magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an a) wp+obfsy fj-1c14 j18-H inductor. What is this circuit's time constant?jso)a1fp-c1+ b jy4wf

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is ;pfmoj+5ece24;o q qyvg8,wt x9;k xc120 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 ou*-v55 pn/ugw wzbevs) tlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is tkf+a:5rxn5j3tkv y epr p,c0 ,he resistance of the lampxck vjny p:5,e+53 ,t 0fkaprr?

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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 cdad7oogl tm o/e(hpx :.4( 6xdonnected to a 120-V ac power supply. What is the peak curren 4 dtg6m./h(x axo7:depoo(ldt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whathlw6/ok ab --s is the power dissipated in the rbwo k-/h6-s laesistor?

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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 z-7 siff3- mb/wz2k0hv.j l sk50-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-Wbv0c w 4c3lelu2;;v1m z hjfy8 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 vd)tl2m,hs .ea 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a1mwg*i8, l ug8wp.gv n 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 inductive reactance of a 2.50-pi+bgy2 dkc +vjs :*4zmH 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 W of invm0r 8.tx dpw/ey 6vd-ductive 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 W1rpgx,p/3caf v f)rt5o.v)t j3dq9rp of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a fre ,zeljdsqemr650ohvi 9/ c 34rquency of 20 kHz is applied t qvzr4r h le05oc/6eis,j93 mdo it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 q p+ppf6w3y3:c1othd 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 react8:r:cvs 4y;)uodrtu:a ) ihdzance of a 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 ngfr lmj/9d+ (feeded 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-mF capacitor have a5bhajh :s(bdwzpd*; ; 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 reactance oc;lx v5 )t6)f gdz*vbgf a 0.010-mF capacitor be 100 Wv6xd;f zvtgcg) l b*)5?

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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 capacitow2(ri0 qcwaqf,4k 0 rnr 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 y6byze29;u j sj-n.ftan ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance?utn;sy2fj -y z9ej b6.

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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 im ir 6:*6zrizanpedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected :azrz 6 r6i*inin 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.w e8u96v;bq t)rdfx 1x0-mF capacitor are connected in ser; tr9fv) ebu8x6q w1dxies?

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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(knrzl2 3( vswh hon(, a 20-mH inductor, what is the impnrnh(v olw, s(zk32h (edance 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 29te* 3 rj9reyjahl)5 i0-mH inductor, what is the phase angl*ayl 3e5ejtr9rjhi)9 e at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit wi 7y+vot)i1nnoth a 20-mH coil and 1.0-mF capacitor for a total impedance of 1v1oo 7 )ytin+n00 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 c ;a(wks3.o *pz(got mm9t:/bmqf bg 3needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000f qakzmgt/stw (pg (9m*. bm3bo;:3oc Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 H8 p wb/wsg3r)zot9dm4 z for a total impedance ofbg/ pr4ztwos39d) mw 8 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-kW resi noa0xdr8. ha+cr c*q,stor at 1.0-MHz for a total ihna 8* 0acrd.xr+cq, ompedance 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 a 20-mF capacitor. iy:kf/s/7h7hkmvn.t;e lc)a What is the impeda: )ak ivc.yehmkltf7s ;7h/ n/nce 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-mavs ,pw9k b5:9ya77 gbb):gt+ks .3 uyo fyalxF capacitor at 1.0 kHz for a total il.s+atbw ypoy:9b fg)xv a3kygba :97 k, 57usmpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phao37fl. duboi,fqs 6a8se angle oofb,o dl86fs a u.7i3qf $40^{\circ}$?

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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 ..u,)yeag-rgv+f+q,; bivcqmaf )jiin series with a 30-W resistor at 1.0 kHz for a total impedance ojqc .vybafuiai f,) +vergg-.;qm , +)f 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 serhpwatzh4cnsx6m v9;2)l9 y1aies with a 100-mF capacitor at 120 Hz. What is the phase annh 2alsc v )99pyzmtx4h6;w1agle?

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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, an/hv6: (qiznbu y gfw+r,t1f g.d 1.0-mF capacitor are connet6+w.n ,zvh/fqyi ub gf(rg1:cted 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 1jm. twx;7l ;jz00-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 circuit? j;l;zwjx 7t.m

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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 capai0gy*3 xvzca7ti, +pn citive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series i 073tc+i,*zp vna yxgto 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 sen6g:qvekvl-xt ;j t3u;f:1x zries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6036 tk: vg- v;x:etfln1;x jquz-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 phaeom:32xfg6vzy oia)2+5pa4iv o a*vlse angle of iy5a+ia 6ov4m o 2p2)vlea:fvz3xg*o $40^{\circ}$ 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 mF. At what freq 2:x,kht 1wdaii:id2iuency should the circuit be driven in order to have maximum power transferred from the drad d1k ix2i,tih2:w :iiving 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, 15.0vuakt j r 83huyh7c5k2(1byt5 W inductive rectjykr y 2318u5a( huvb ht5k7actance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of anivc (c+*gfbgsa58r iu9 4, pmb AC 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 cyw1,* mhlzub/f tillkn39) c:/;rlpq ++yro has an impedance of 60 W and a resistance of 30 W. What is then/w3ri:l lqh+*yc9ybuckl )o;zrt1, pl/m+ f power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W w/mgxvg-/w, eresistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hg ,gv/e m/-wwxz 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 ym 2 q*62r06mt;ovcjrap: b licapacitor and a 15-mH coil in series?0cqlr 6yo abm2 mj:vi2pt*;r6

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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 wiwtbu2+p.h nk( th a 4.7-mF capacitor for a resonant frequencku( b.pw+ nh2ty 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 needed in series with a 3.7-mH inductor for a resonant fre5ok3hc: oay3 aalkzj:0b ;i.hquency of oah:ki jk.a:hayco3 3b z 0;5l1000 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 pla v7l)pvk+ prh/e.dbr9ced in series with a 30-W resistor and a 40-mH coil if the resonant frequencydkl h 9pv/r+p.r7bve) of the circuit is to be 1000 Hz?

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