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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 u(rsdqi5wy2l 8nits 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 vur xr+/- e:fythat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on thhht5i14 1p ikr3 fsktsf(8 k;he inducet(458fhh pfss iktkri;1hk13d $emf$, 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 magne5 ic-8j ck5byrtic field through a loop of wire produces what kind of change o5rjcc- 58yikb n 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 produced7 uygk+jy ii9931abis what kind of change on the inducay9iyd bji g9i7u 3k1+ed $emf$, 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 mvh7*u7s y. e hai,:knfrom 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 current i ) cjsd99y;pnwn a conductor will be that which tends to produce which of th;9ys c9njp)w de 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 bk6sylo. q6u c4zq:q/m4we 4d:i 1skcxr g1o: flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The sta1i:/q kl c64dsmxes gobyk 4c q46:q1or.u: zwtionary 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 horizontal table. A bar magnet is held w )hk g)3nx/yl.3ht djluaz:5 above its center with its north pole pointing down, and released. As it approaches the)h3 )d:xhl y35kw/ gz. tjnalu 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 a rei;vxpdug0; ha2 jl o(n:2wk s:gion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as thl2(j0;wh:i :; vka ndogpusx2e 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 v6(p0d emucft1m0k 3o the magnetic field vector points straight up. vke3ct(ufd 6mpo01 m0The 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 a region whgtjs0jng/ 1u:ere the magnetic field points straight down. The magnetic field disappears suddenly. Wheng0jg j1u:tn/s 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 ay 8mfo /u(snk8rw n9e(n 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 curre9( e skmyn(ownr/u 88fnt 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 awx .;69,dxytaug v2:3aahmn- cu2zxb loop of wire with the north pole entering first. As the north pole enters t3y baz x2x t6v2dcga;ux u:m9h,-naw.he wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular bbriso; u x (5*coqx).speed about an axis whose direction can oxsor; )(x b*u.qb5icbe varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 speb v76t)er6 1qqmx+dgr ed about an axis whose direction can be varied. In a region where a uniform magnetic field pointsmqg16 r v7+eqr6b)txd straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.3hi,k2m** 7sg hkty nj
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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 th yf 8yimpdd-)sra ckdn:s0a 5tbyw-1mu3f4;4at 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 magni** ex pqgykih8 1q3pp/ n9hs.etic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west yfr wthc1;ckf4-r0 p0 direction) is moved northward at constant velocity through a magnetic field that points straight dowf00r1wph 4;f-c kytr cn. 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 rota3mh,nwp-4ffl oda +v6 jqf:c,tes 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 - imh) gqau*g(s tiq1-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 through 60 revolutions each second. The f 6e *5*wu;jg7 oyuene *rsvly92ig u3erequency of the 3iee5g e*9 y*2v*el rg nu6u oyu;w7js$emf$ 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 sgly(gak)ek2(d3dif. 5ix, g used 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 dev;fm;(u ds7p otice 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 coil contains more loops than the pr e(x1euwdlq y uvr9;mduq29-z4,v ix/ imary coil thxwq v z9du1evliy m4r;,q9(/x2d-ueu en 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 contains more lof-0 oz( ih+qs0e( zwtyops than the secondary coil then it is af0q-ew+(y thoi(z s0z

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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 isuib2; ,6-s0j3j gcvrk-gy;,n abx vdnput

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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 circfy z:dtfoivt-(n -)rp;ix9dx p-( e,s uit,

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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 9xzio5+ q6xsqjjpp uugbsv pf.( h ;(c:.,wq7to an ideal battery of constant terminal voltage. At the moment contact is made with the batte7jq p(,v u(;qw.p6hq c xf.95zsu:ogi jxps+bry, 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 ;o+7 jdy ol4ieh(w, f-ky4 aysin series to an ideal battery of constant terminal voltage. At the moment conl4,4 a kiyjoy7y+ s(hw;do ef-tact 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 buad zxd192z r.r0gt5 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 reslzvzc* ic; .1sistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a ba9o/uh)/jp.dt7amu o lttery. The time constant for the circuit represents the time required for the curjp/ . ) mot/dh9uoul7arent 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 inductkdfme99cv 81poo i 5t5or are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represenipvm85995e1fc oodt kts the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except:2ql n+ x-b;nfi

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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 currx8a-j+ l8eyng z yx9+g* /od,knbvgm; ent

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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 supplyrctr qs89jr)va/g e9-z7a/lq . In this circuit, the curren/r -/q v8c)qag79atsr9 rzeljt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factoit dnr 0mdoe /3*b/vy*r when the frequenint /e3r*v/0bd*d moycy 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 doubled,s+j*b5- p64eumbja+ ke .yyv yi5mau, the inductive reactance of thi.pau eym4,j+ma byeb5k+u56 * sy- jvat 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, t5p g s99r 6d2 8nxbxqax6ilu)hhe inductive reactance of that coiax x6q h)sdul9bn 28g5r9ipx6l

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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.1v nr tb :*(wivnehn1qwwc48 circuit, the curre81i : vnq*w. cnevth41nw(r wbnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactan /rny59his; f ) .jhq*ok9hi:pj*vtiace in an ac circuit changes by what factor when the frequen:j*noijkhpy9a 5 *ris.; f )v qi9hht/cy 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 acru zg.l9xd+*, 5mqxu kvoss a capacitor approaches zero, the capacitive reactance of that capadzmx+g 5k *9u.xu,vq lcitor

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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 n*5uleo0sjb3 v 3,dtrcapacitor in a RLC series circuit?3,ev3ld su0b5r tjno*

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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 cirk 9p- o(68melk67xkq gziniv3cuit 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 circuixsboh03r2rvn o:6ta9, 5 wmqd t. The impedance of the circuit increases if R increases. When is this s hsa23o:5 ,0 bqxo9nmrdt vw6rtatement 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 circuit ii1veoqy -gsc-6q- ) mfncreases 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.ag1rrfmq2zj s (.p0 q8 The 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 cjyh/l4obwmg 5 9n).ogo2 prv)ircuit, the resonant frequency of that cg 2lghowjp)r /9nbov54. my)oircuit 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 mwcqt1jw7 + vt -)fp-gby 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 series60j4+wg,gio jwok ;i y RLC 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 w1j3ktk4k ea7s 8co:tk2 d/od9vh0 oais 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 8co1o2kvat0kea4wo /h9k:tsd3 j 7kdparallel.

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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 unifornh5fr1 te 8o7bm magnetic field of 0.20 T. Find the magneti5nh1et fr87boc flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniformy nf,:tp48vk f magnetic field of 0.20 T. Find the magnetic flux through the loo: pny,fv4 8tkfp 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 adjustable single loop is reduced frms8r)sn fo5m a) w7u4yom $1.0 \; m^{2}$ 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 ci m7f75jxrd f*oil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square fraatle53g3fr eev+-4 *;yqjpgxv, ,rbome with sides 18 cm. A uniform magnetic field is4*y+gt,g-qev avf53r,jp ee3;ro x lb 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 turn: l 9ij:dguu w,wk09fxs 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 a :03(q/e d6zc h7 (puy hcjokeiw*okbq.:l5hj 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 flies horizon4 t.df.tukt, m3ve uhf8 t9y5dtally at a location where the downward component of the Earth's magd3dt..yt m85vku4f tu efh,t9netic 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 angular7,vos7 7zjv pkunt5v) velocity of 2.0 rad/s a p nto5)z s7jvku7,7vvbout 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 generatoglofw- 3xs+a2w s-kb -r has 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 consisqa*a(l br m9g-;d5ttuts 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 $emf$.

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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 rect un )lc/.a3bjnangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates i )unn/3lbcaj.n 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 consgp m,w en )qt3npe+5rhsyg80o,gv(3 pists 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/m(oc 0kfjk7s/ pa)tn n1+dm2y j .izz simple AC generator with an output of 12 V maximum when rotate2/c o7dntiz ka0 z pnj .smk(/yf1j+m)d at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a gene e8jk+qsv6 bj)rator 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 onxxp1w 8zmn 1csn .6e.f 6.00 W. 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 operatk q; cmtwa:5w:es on 120 V AC, and when running at full speed it generates a bac;:wq m:t5cwak k $emf$ 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 6cfrgh - 2 vn8e p,twb,apu7i3(.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up currenphgr,,n 2 tf3(ec u-bvi7wp8 at?

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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 o*cye mbl 7h)tgy3mk8d*v) i7is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wd ykm3m7oby8*v) ei7t)h*glchat 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 is cy 8u xd2w2l8lgtwd / btg/vz(0onnected to a 24-V power supply. The operating current is 1.0 A at full speed. What i tlzx 2g 2y0lb/vdtw8(gdw/8us 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 primary voltag25n7rauai-;xq525vq m2ywa glom5dpe 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 causu 1l eea:vqw2+es 14 A to flow in the secondary. How many turns u+2a:q1 eelwv 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 necessary in a 11qr.h -u1w7hrw0-V primary if the 24-V secondary has rh71.r h-w wuq100 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 primauxjq vhbehi+0p rn76 e(gi8 q;n8i/q+ ry coil and a 2000-turn secondary coil. If the current in the secondary is 3ne/ (q+e giuph8vr;qq+0 h68ibxi j7 n.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 inua 3,3gpb,e bihw1io lg x+;8cbxs 6*p the primary of a transformer. Assuming 100% efficiency, howp3x+pb*6 b,3ex,i1o awscg8l bi;hug many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provide;5l8 f;dvor9q xlec7 cs 7500 V at 10.0 mA. The primary coil operatef rl5cxve9od7;l;q c 8s on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on 7 63luk,hlfcdnrdf1 *its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in l*rn61hkfd d7f,3cl uthe 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 coilo /8wyhk cham0g(g1vl bo:z v;v-qp)9m0 m 8ol and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in th8 z)8q0 0g lm;o hglokwbm:pv( -caoyvv1 hm/9e 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 ygkugw,-ps d7o0:6fds2 hz b -200 turns. If the input current at the primary is hu, o2fd0z -b-pyk6g7sds: gw 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 secondary has 200 z4n,;v yp oyjs954uxjturns. If the input voltage to the primary is 100 V, we can expect the output voltage of theo jy,y5 4;z9jn sxp4uv 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 turemrd-mtujy ))4c48 x jns and its secondary has 200 turns. If the power input tor )4xm)j-y 4eut8 mcjd 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 at 120 2yf m7,spvcbvkzpmla t;5 .1 9V. 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 number of turns inzamf9v; c1,pvkm yl 2b5 sp7t. 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 voltage i. jvn7uge p.a1gp)rb:s usually stepped up to 4500 V by a transformer and transmitted through a power line of to)b.pgu7 .pevgn1: r ajtal 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 60 A of current at 120 V. The voltage is usually stepv hsw/mc zq0n (l.h9;qped up to 4500 V zq/h9(.mhqc ws; vn0 lby a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped 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 l./r phm k/d(chaq,o :twxl1j-ine 50 km long has a total resistance of 0.60 W. A generator t . d-kwho//,(lx r1m:pqcah jproduces 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 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 resistance bs1 7-w8al c(aogch (sof 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 turncaw-(lo1(gbcsa8 h7s s 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. How much less power wou,u/w p9;juaeju )jve*ld be lost if the pow aej ;u/,*juuj9e)pvw er were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmittedh7ydb 68 f4kpnw 8ugg*+ oj)kr on a line with resistance of 0.60 W. To what voltage must the generatb h4k +76 ukyj8w)p*8nggdfroor 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.1a h g.5v+sxnazj u9d8 How much energy is stored in the coil's mh1z j un8avax 9d+5g.sagnetic 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 18-H inductor. What is th lr0b/il ekv21is circuit's time constantirv e/b2k0l 1l?

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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 ina. :w*kfpkz- r an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed i1a4rn jtg 89hah b3 qvuwg33c2nto a 120-V AC outlet. 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 2uoiw8 1*at ,zer1db -ij( 2i)j4sx flklrnn/120-V AC outlet. What is the resistance of the lampi/* ) -rnb ,8t( rj1dsikjux 12nl4 ezoawlfi2?

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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 connecuv2 :sfq/y7dmeb3,ha ted to a 120-V ac power supply. What is the peak current through the resistor?3bs f7a h u2/,v:emydq

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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 connv *zt*xp4dqy2omgvsi ;/ t5i,ected to a 120-V ac power supply. What is the power dissipated in 2*o4 gt5i*/ tpvdmqxz ;,viysthe 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 wys* on)*sh6 iresistor 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 5x 4 r p*p4-hjau z19i1zxo/mdhjl(,ph0-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 50-W resisto c64 bu)kfnw8)um9bez.,lqz xr is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inducgd u)sdg q:g 1w .i/mbtq2-(uhtor 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 ree1g,obplkiii(1 6ev vo 91e1ractance 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 reacta 0 +( wu+twmz5fzxq*vpnce?

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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 induu7p :(9ml8d - erducyvu v4,kuctive 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-o;30;)2/ cdrttkoqpqra sqv :mH inductor when 120 V AC at a frequency of 20 kHz is applied to vq : kao;s o3/tr ;t0dc2)qpqrit?

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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 110b5 kxh1p jyq;tgvhw4k -,f tlw6+t7s4-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 capacitorn++si 6 ln olowtmw g64 /j4s9aum/ak; at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHeypaj2wuo 2:s. /vmb72kbx i-z?

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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 1200s1wxih4zth)sn9j5 ) r/zq6c7jpic j 9 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 0.0,nbu kw3vufi f 5t.z0810-mF capacitor be 100 W?nwiutf0.bk3uf v 58z,

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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 atc9tlt*fn89ogd7pq 9 g 4go0iu 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac sej9m92jqgo wt0ky,.e .mksdd,u4+ezbries circuit with 12.0 W resistance, 15.0 W inductive reactanceg , ot4 dyzd, .bjjw m2kk9s0eqe+um.9, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-a g;pk24+b puf b/vbm-mF capacitor arek4/2;+fb-gpb mabp u v 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 resistoyn7 70l:8+khwljhqil .i ws:er, 20-mH coil, and 1.0-mF capacitor are connecte:hl: wykl +enq0l 8hwiij .7s7d 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 i x/hnt5 h2/q-oa e16: ilketu;imx my6ur,(f in series with a 20-mH inductor, what is the impedance at 10 xmn2y 6xt f -5 qo;e/huik1mri:aet(uil6,/h00 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 conkqb0y(xo-upc y;y* g5nected in series with a 20-mH inductor, what is the phase angle atyk-y(5 ;y bo uqg*xc0p 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 se f5ofgy8 8c0jzb,q/tgries circuit with a 20-mH coil and 1.0-mF capacitor for a total impeyj/8b5,g 8 fqz0ocfgtdance 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 capan,x+ o3z elfcpou-1 -fcitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz? ,+31p zfeo-fuxonc-l

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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-3hv0 gs 2sjhvxs/ 9ba inductor at 5000 Hz for a to3v0vg/h s9 h-sxsa 2bjtal impedance 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 (i)ux x q,smr-series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW )qi-,x(sxur m?

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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. What is the2,v4 b6wompnd )zk.n 9a5ruec impedance at 1000 Hz?n.)m wro45ka nu9 cbe 6pv,2zd

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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-m.r/ aq(l9yz.wv vg6cir2 yt,xF capacitor at 1.0 kHz for a total impedance of 45i( a.wr/9 6tq2lgrvx.z,yvcy 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 ca e n;i)eli5*5wbhpu:z pacitor at 1.0 kHz for a phase l p*enz5 wu )b:ei5ih;angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resisto lyq5)wc u0aa3aou:ga5 be*g3 r at 1.0 kHz for a total impeda5eg oq3:03)a ya* baclw ug5aunce 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 sz,kq kj32 qc7zi2t )f/,:e+ mxzwmjy100-mF capacitor at 120 Hz. What is the phase anglekqjsz3f7x2yq,jz)w,/k : i 2temmzc+?

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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 anpqoa44z evtd0 h;b7 a6d 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conzp406o a7da4vbe ;qht nected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, ank aq-m)bh7 mo5d a 0.350-H inductor. The circuit is connectea qk)5mo-b7mhd to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an/.y eu8 q;e h60zso,qrdlp d)u inductor of inductive reactance es 8ep,q;zd0/uoyq. ud 6lhr)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 containina p/ k()r.ws64dhrcsqo74rwg- 6fyomg a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz 4psrk(fow7 cmrw-od. 6hy)/qra 6g s4 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 wio1z(eflstx ed+1a;ipuf4x 5 -th a 500-W resistor for a phase angle ofoft1;le5 4ps a(d x1uze-ifx + $40^{\circ}$ 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-m6jhu,uh6xp/dp 0,zmgo 7eez7 H, C = 10.0 mF. At what frequencyu6p,,h je u 0o67/zzhegd7m px should the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an4 n c:s3qr z) x+ph/qng.szq0l ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive nnq+qpl)zxhqzcr. 4 /:3 sgs0reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC ci(: : y4 srjqn4uqmfkb l i,x9/a9x,udurcuit 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 impedancecrn7z,5ewoa xw),(7-a(s cm (hhqgp a of 60 W and a resistance of 30 W. What is then(he)oagrc 7a7 x c,hwz(p wq,sa m(-5 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 cj/ce eod ke w+np655e6ontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz cdn + ep/6e5ee6w okj5power 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 frequenci*2v*1q b ziwiy of a 1.0-mF capacitor and a 15-mH coil in series?*izv1w*i2i qb

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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* u+jpgl)t 0n4wunc x5 4.7-mF capacitor for a resonant frequeulj4c p n*gt )u0xw+5nncy 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 f7rziwk r h6+f2ivr)8duwh83m g s. ;zfor a resonant frequency of 1000 Hz?.i2;f gh36i hwr)d zsmrrwfz8+kuv7 8

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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 witha x8k:mkz;me4 a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1e4;azk8:mkxm 000 Hz?

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