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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: 游客未登录  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 a5akz-r +rlol1 re units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thdw6rns7+o;m fe $emf$ 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 change b5n,+kjfhj;l +b vs -v5d8 drt+jxzc9 on the inducedjj+ hn9v-xbbdlvzk+ 8+ ctd5, sj;f5r $emf$, 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 ). /(:*hoppte tpkcfc,(np xj86kl tq5w9aox field through a loop of wire produces what kind of change on the i *f/ aw9ncqxo6o:t( )p(xjt,ht85pk pp.ek lcnduced $emf$, 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(cllnj,; go /un(b7r*yx zus f)*t 0vx what kind of change on the induc xng; x,vsoj*uzbcurfyn 0()t*l/( 7 led $emf$, 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 kvpnqzm6: g-w8n,/ dxx0*pa ofrom 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, the direction of an induced curre:sfa4x,p u(cdkw;b fjqya1x /w a657s 9 )eexlnt in a conductor will be that which tends to produce which of the following effects9bw f 4 ldsaw5(7: ,ceapy/ 6x;xsqf1xue j)ak?

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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 hori c 7wpz7o:oju;zontal table. A bar magnet is held above its center with :zo77u w p;jocits north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a hrxtsou,0 lx 0t*w)ibpcr (6+l orizontal table. A bar magnet is held above its center with its north puw0t0 lr6 )bs x(xro,l*+ctpi ole 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 tl)tjfe- cd1gvbvrw rir8.ybx8 )+/* iop in a region where the magnetic field vector poini8fvc-e1r)r jd+wv 8lytgbr )*bx i/ .ts 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 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 tabl*w-x+pi41yl2j2 fmqrl sgm x xjeeuc p88q5.,e top in a region where the magnetic field vector points straight up. The magnetic field suddenly gmlq,.2 1yx8jc gxfw-2r4i +xspemqj8* u el5prows 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 a region where 8,d lpk7u1rx* xcd7:zv5oqdsw bj/: tthe magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this ckr:olsx8vcb zd:q dx/7,7 pj5wdt*u1 oil 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 tab wi7v 2h-pnrp2le 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, thpph2i 7vwn2-r e 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 wirz k/:*c zoh n2 uu30,x92ki db9urg wgjuwg7)we with the north pole entering first. As the north pole enters the wire, the induced current will be (asgg9*jx9)i 7 wwr gh/uuu c2ouzd2knkw:z b30, 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 constant angular szl djc 9-u k:*ukjqoq mw44*i/peed about an axis whose direction can be varied. In a region where a uniform mag/mq o*-jd9l k kic4quz4j*w:u netic 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 *a guw c/*nek6angular 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 */a6c gkunew *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.98j+dr ckcg0uic 8l, k
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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 t07be pa+o; phvgcyz)rlh -l;6ug-m4 ahat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnegs4(y) *pn8g:y ad ccitic 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 thboa;5x 1ez8bz9 zpl.c3b 6gsb. qf)ite east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across thezstfqb6czb;8b 95gx.3 z e)bpoa.li1 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 rotate 7vd nixnr*6u+s 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 generato lrils/- :7wh4woq w::wn-av lr transforms

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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 th8ns b17posi/a6tmp -vrough 60 revolutions each second. The frequency of the -m istvpos 87n/b61ap$emf$ 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 usc(4ru //tvygpg8 ulp/ ed 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:iyt -1kh 9ffn 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 tl6 pg;ti)+t rxpi* no-he secondary coil contains more loops than the primary coil then it-px;)6t onpli+g*r ti 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 prc6f+1siut w 8ja: sjh+imary coil contains more loops than the secondary coil then ih +jt:aw sj6iuf 1c8+st is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power in: bgl/lcgz0/)lgl;t vput

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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 yg- c m/yts0)qtbnm1:nr7x 0yircuit,

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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 atf 1 gp l;o kn.f-geg4g,1y0fzn ideal battery of constant terminal voltage. At the moment contact is made with the battery.og,g n-l;t1fpk4 1gyeffz0 g, 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 connpfxjezu 6cc,z+ 3qf54ected in series to an ideal battery of constant terminal voltage. At the moment cojp3,u fz5zxc+e f46q cntact 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* ab1o+ 5cadp zq7fwi- inductance 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 and resistance R is connected to b- zrp.a3f6 wg8w1hdl 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 ardsviwjb 2- s 2cntl dg9 k866t2-zlb0re connected in series to a battery. The time constant for the circuit representsb6-26l20drgw8 -t kcvti2 zsn j9 lbsd 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 utkk2sb k3i wm cxx h.63q;.cjt0vh-1are connected in series to a battery. The battery is suddenly removed from the circuit. The tim 1 .ijx2- .khqb3mtstk0 vw3;k hcucx6e constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the)+ygcvln8uwrvz - 5 v( same 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 circuittxlal 9xc*dk5**p3 jogcd nu:*p vk3/, 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/wvo cl g5z /h:b+pd0d to an AC power supply. In this circuit, the currenp/l gzdbdwo05:/h +vct

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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 changerh/m,9 v 1gy8 ; jzix13l jtvp1byl0qss by what factor when the frequencl g0 ,b31 1vryyhij 8 z;pmxtqvljs9/1y is tripled?

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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 an inductor is double9a( p k; twa aactk9kht(,(.y,,fnqm rd, the inductive reactance of that,fy aaq9(k pt n;kah(tmr t. ,cw9ak(, 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 vf j yfdb;:*d+z+hnfpz -15akvoltage across an inductor approaches zero, the inductive reactance of that cod:b v5zff da;fyp*kn+ 1z-+hj il

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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 powj7 jau2 fq.0kzer supply. In this circuit, the current uaqf.k20 z7jj

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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 fre2l:,q0euqe82vp 8 kb5 f-sc i6sw mwlqdoc4c5quep weblw v,le8coqdq s2856 i4sku05:-fqcm2 cncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the cg. 1,(; tpz:kmuyvpm kapacitive reactance of tha (m yktv:u;kzppm.,g1 t 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 in ay j; 4lze5(l1cadm ag7 RLC series circuit? l17jdz5a( gacely4m ;

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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 defids l58a1tpf zvx9;i+j ned as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R p 8zj+ia8fh7 xqf.s,rincreases. Wh8ia +zhpq f,x r.87sfjen is 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. The impedance of the circuiztb8yb6 q -j44y jtg(bt 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 impeda5x)5dovv ns6rnce 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 z(qv3leo*g6 m, the resonant frequency omzg 6(q* v3oelf 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 an AC a kzi;kc -4iwq;pplied 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 ci(qdc2 mlvcx-:rcuit 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 ru;vy q5i ii26a24-6w kfj wcswotating in a uniform magnetic field of 0.20 T. Find twaq if4;ky 2 -6vs6j5ww2iu iche magnetic 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 rc 0q)+(przuuiadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane 0 urqp( c+iz)uof 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 rotating in a uniform magnetic field of 0.2 cm)07bon 6o pnu8a)zh0 T. Find the magnetic flux through the loop when the plane of the loop and ou m) o6czhnb7a)8 p0nthe 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 adjustab*y snc26x)kovi,ea1 rdy3 bby i)8wh.le 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 fr3m*fdp+ ftz *5pdeu 5uom $4.0 \times 10^{-5} \; Wb$ 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 tnu/ (g* j ffgmucf1s/k9)a,bpurns of wire on a square frame with sides 18 cm. A uniform magnetic fie9puju /f*n,b ()/gf1k fasc mgld 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 t:y:w )l iz;xrgi58 j.zwpgzin5 ke72ourns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and are*f w83yry+yfkiqje8 . a $0.20 \; m^{2}$ 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 horizondug, 6ley9,y g*oavd.gc-+7bf, iq gptally at a location where the downward component of the Earegc,ig6v lgb9dg y7yfq.d*,a +-o,puth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velk1b(eqq 1 ay0 u0a(k3 jwnzy7iocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetiy uw7 ak(akyqqe1(0031ib nzjc 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 andouhkc 1r0 h.4a 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 oib8hux v)ort6*- b2g hf 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 $emf$.

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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 h */auwmtw*g vwj6f9 3armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpmaf9g6*j/uww*v h3t wm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tur0du :zn8zly)kns 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 wi,m9 bj0* vevzuao/;zm /x kd1hth an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil 0m 9/hb;/kzodzvmv1 x,u *a ejis $100 \; cm^{2}$, 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 genero 27+0 j nvmgaxwss9oo.na-nz8 xc q28ator 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,a0zzh+/8tk: ttff a.w; xzma 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 res*hlu7v(q2)u. a ztlq iistance of 6.00 W. The motor operates on 120 V AC, and when running at full sz*q (h)la7iu v.2qtlu peed 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 internalzvk(/nvk 5+a2x+ka vuki4 / og resistance 6.0 W is connected to a 24-V power supply. The operating currentk(4n5ogkxz+ k+ /v2/viaukav 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 is conne g s yvij4/w:otihy0y0.+e1sqic5c6 ncted to a 24-V power supply. The operating current is 1.0 A at full +. :y/4jo6chqw1ev iis5 tyy i00gcsnspeed. 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 resistancer-5krn5nl z-k r;wm.d 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whatr zkk-ldn 5n.5-r; mrw 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 pr bs39)sg j0y ts0qwav:imary 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 transsj63gd/eklxd 4ri4,r former causes 14 A to flow in the secondaexdrlj r,sdig43 /64k ry. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necess,tfaked g85c(9de0yoe 8gz e a41uk0hary in a 110-V primary if the 24-V secondary has ze15(ekecfy 8gd oek0d94t,a0au h8g 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 6yi60znewlh +(u)vs p.hai2 d500-turn primary coil and a 2000-turn secondary coil. If the current in the secondal2hhwzv+i6( p )suiye.n60d ary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the p0-4*ce/j+fqfm 0 etkf l8ej verimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the s c/et8 m40kefle f j*vj0f-e+qecondary?

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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 provhfu9f*fqha0 a 6w vr y03;urc1ides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doeufuafwrf q6v hhra;y91 3*c00s the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns onditbeu12s6j+ ht 2lpr2it0 i* its secondary coil. If 120 V at 2.0 A is a2tdu2 ji b+ l*ettsp0ii 62hr1pplied 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 4/./kli hrd ywzx: lb6secondary coil. If 120 V at 2.0 A is applied to the primary, what current is d. y:r6kbzh 4ixwl/l/ 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 1jys3brk1 su,000 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curres3uyrbsj1 0, knt 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 transfor* 8:vywrd+9qljrtv z se a)f1f*m.-vg mer has 100 turns and its secondary has 200 turns. If the input voltage to the pr-1)m f .y8l fzdv9+* jtvrrewvs:*aqgimary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tur ddzj/79amgd,o h6s.tfcj:2o ns 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 6d/scaj79od tfo ,.2zjg:md h to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually qylv 4 w+1al,9 o,c31 vckyhpnstepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turhyv9vcplc,3 wakn qy+ 1 1,4lons.

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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. Theat(.zv5b a7 m-pd*hbn voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission l 7z*a ad-5t(mh n.bbpvine.

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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 curreb2:5w.kug cwmozl hs 4.l(hn5 nt 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 percentage power lost in th zh2bg oll5ch.u m(4wn :5wsk.e 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 totajou;cya2* rqh, h yc+6l 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,cr*a jyu+6hco hq;2y, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resv;du+mvlc96 c istance 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 the transformer is usedvdc+l;m69v uc?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wouh a+t--irpib )ld be lost if the power were transmitted at 30b-i a-rti +p)h00 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 generatoj:olwz)d5y 8 or is 440 V at 20 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 j:y5 8lzwoo)d 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 m.eg 4 k7urg pi3d39zlmuch energy is stored in the coil's magnetic fier ilz g73pgde.9m4k3 uld?

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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 contaie8 ):dxo)53up z omnkxns a 6.0-W resistor and an 18-H inductor. What is this cirx 3zk8dn5o:pm) ) uoxecuit'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 circuit where the6 k1lg8rye d)5l5 kk)pvivt-z 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 ou b:f+a*ej7vb o ,g6 j(yzkklk3j3qmd 7tlet. 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,x8ss-s+g ul c AC outlet. What is the resistance of the lagcs+s, 8sux -lmp?

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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 poafcce,1b/hf v+kn40rggzj;,wer supply. What is the peak current throug0bfcge ,ca1 +4,vk r jh;nzf/gh 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-czci1)*p1x2 b z+x4ucb vmof 120-V ac power supply. What is the power dissipated in 12 )zcix- fu1bm*o+cvp4czx bthe 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 5 x cg0cu/uusf )+4fiv/0-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-Wpdu v10d:ip0f 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 50-W resistg,-r 6pg yj+zsor 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 oqmamry td/,2ld3c, rez;znf 1ufl 268f 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 inductive r*lm:jdefg4 i qf3vz1 :eactance 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 W of inductive reactance.xw uo gsp)a+(i; 0nikoci h2,?

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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 rea; 79wo sv(t6og 3 u-cp;t+gijop 3djbfctance 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 frequency of 20 kHzax3+je9 typu) is ap)9ay3x etup+ jplied 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 110-V, 60.0 Hz sourcetrml +t.t5)8jmlz :xp?

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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 capacv (v7k(qr* xp dq.wfrb.utl 8(itor 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 y q,.i;rew,)gptc j4 zneeded 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 capacitivntyiyjb/o7;ws24;mq( . a:d msm4kor 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 capa.e wyvk*( jj,pcitive reactance of a 0.010-mF capacitor be 100 W?kj* .py,j(wve

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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 2 gn9bnnkk rt m)3sjs;b/9q/ wHz 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/a4znd k et:l3 circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacit:4a /ln zt3dkeive 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, anm8aa5 ekr 3ui-d 1.0-mF capacitor are connected ur- k3i8 meaa5in 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 100fvcpc-5drxzmb6*: xu-0y7 1 sg0 hgi z-W resistor, 20-mH coil, and 1.0-mF capacdbh10*7z -z6 g0x mrs: 5xf-pgcvu yicitor 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 connegotr;l )l:gg;ff6ru u y-eh0 7cted in series with a 20-mH inductor, what is the impedance at 1: 0r o6gg -hly7 tgrf;l;u)efu000 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 serie79xk gk*,l;2vaavj ows with a 20-mH inductor, what is the phase angle v 9oal vka*,j7xgk;w2 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 with a 20-mH coil and 1.0-mF 6k8xo)ip ymk6yl*k(xz)xj i3 capacitor for a total impedance okk)ik* )yx x8z mx36o6l i(pjyf 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 o ddz 4mb.e ( f5poq j/5ad-oawty))z8needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at daoj a)d(me/pd tq8wf.ozz)y54o -b 52000 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 i- rcve prbyf+2)67zsat 5000 Hz for a total r+y7p r)se z 2cbf-vi6impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resisto y mcf rtt*sba-8v9/y4r at 1.0-MHz for a total impedance of 150 kbv4a9rm-* cy 8fty /tsW?

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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 capacito8-w: -n8dxxk5 tbmvyr r. What is the impedance at -dk:x8wxyr5 tv8 -mn b1000 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 capad/4* ioi p3b 3pqdm5hpcitor at 1.0 kHz for a total impedanpq/mdphiop 3b *54di 3ce 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 thygm4-q nm4 ;capacitor at 1.0 kHz for a phase anglm4ny gm -hq4;te 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 aik,q 0o,c ki:s 30-W resistor at 1.0 kHz for a total impedk:os,ki 0,qci ance 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 capacitor at 120 Hz. What i64m/nv . 1hb)tjrwcco stm.s* s the phase anwoc/1mvj 6tn t. 4srb.*m sh)cgle?

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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 Hsp k s* xr 28b9tjrd qf+di/,lgc+6c5yz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri d5ylq *s +,ftp6dc bg/+8rs29 jcrkxies?

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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 conss zpyxs04(q1+ ekmj )yists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a p )+(ey0sx zmsyj 14qk120-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 capacitovi.q /nq/7phb r of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current floqbp//7in .vqh ws 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 fo1r1-z; nvl h-u nefme(r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conn-h( 1rlmnz-e;u 1vf enected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W q mgb4l20 mh3o*di(h4x ;aqp vresistor for a phase angle oih qx (haq pg2*vm044dm3olb ;f $40^{\circ}$ 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 = 1t 855o/l pnhmv0.0 mF. At what frequency should the circuit be driven in o/5n pv58thm olrder 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 with 12.0 W resistance, 15.;sv9y d b-l,)/fr,u*d ykodmd0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit vy 9dr;s)om ,y*b /u ddlkf-d,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 circui7o cr*yr(s/7/w ryc 8bt(;y*gtfzp mqt 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 k)lk-t 0y 7kbk8il jf*and a resistance of 30 W. What is kkitlkb0f*k-y j 87l)the 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 sex5fygv hc *bvtm1o4(4xvmu 0i6+p h b;ries RLC circuit containing a 50-W resistor, a 10-mF capacitorx5vgm(vbymith po ;bx+ c6v4u*104hf, 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 capacb x7s/0wo4nth itor and a 15-mH coil in series?wohs0tn/b74 x

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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 capaci42qu1a / kjsl- bo-u/xj/f azjtor for a resonant frequency of 10 kHj-u4l/kb /j f-z /js1xo2qauaz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needee(xhga87am;h.f e ytui.91vy 0ejgw+d in series with a 3.7-mH inductor for a resonant frequency of 1000ut1.fye exhg +h. 0aeymg( i9aj;7w8 v 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 series with a 30-W resistor and a (th/d5 .gjvq a40-mH coil if the resonant frequejqg.a5 d(t /vhncy of the circuit is to be 1000 Hz?

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