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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fluxypst3((xmo m -f5l*;l ,gv qzy 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 inductinf1 xh8)-ouenon states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produce(rdfw jn8+utlnlx- j+n)m 5x6s what kind of change on the xwlntnl rx8-f6+u+ (d) jmjn5induced $emf$, 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 3,4 iur bo4 gjsb,wk1-po 6xyha loop of wire produces what kind of change on the i bbr-kw6g4 hxo1jpos 4iyu,3,nduced $emf$, 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 ov uf5s,sp 7xy v)9m+ )uf2ls,gf4rhfr f wire produces what kind of change on the inducedl7 pm)xs)f y9fu rsv4gv,, s ff2+5rhu $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetwa h0ifkj -s1mnif.ylt 1-f*7(;+n 7zfxegkiic 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 dirw9a,7 9m5dn31ulet 8 r e0wtr4+rnradd mz g)mection of an induced current in a conductor will b1)mern4+99drrw ra d,e mwgt3ad57umn0 zlt8 e that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above .zc2 2th5;fs4rft iok its center witts2 ffhkt. 42i;oz5crh its 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 horizontal table. A bar m8,iz gsn,sd fyz85 abdbz -zhnp7,h d oi-02l(agnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the85idzl0fn yd- snh, zgzsbz a, o8 d(-p7hib,2 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 region where the magnetyp(j b 8ix.u;0jfw*kzic 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 th jzi xbk.w0*u(8ypj;fe 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:wmk ymcq n,8. top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of th wq,knm8: cm.ye 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 the magq4 djl5um q s) h7(*.0uzc8tmlhr8i jmnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced curm8(iu.qclhzds m8)hrtl*j 4uj 07m5q rent 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 liesphrky+ ugnm(g9rj f7 g5n+x24 on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abov 9 xgg4kpm r5yn (+junr27fg+he, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of sfc 8,7ac6 brbwire with the north pole entering first. As the north polsf 7,ab 6brcc8e enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rot ,acu7y8/qi/cy)w lhl ated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must bey7,a y )cqcl8/ lw/ihu 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 constants :exmzo zif(3)cq. 9+c oa(ry angular speed about an axis whose direction can be varied. In a region where a uni)ai( oze.c yrzx9(cos+q :f 3mform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.l7 h*yf2b cr6el:w jf:
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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 anr8ra.2a:osls.,1jn i* l qhw k $emf$ 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 fiej-4 zf6vsb0gq ld. 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 (orcbp5i3, 8hhh-uw e -uziented in the east-west direction) is moved northward at constant velocituuz3h -e-b, whh 85icpy through a 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 verc(1.vmb, a2 )rxak5s hy i4wulocity $\omega$ 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 transformldz9,rl 0wfgqoj 3fz2/51vo.,qz cf n s

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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 revoluti (5 qp8fe2 *pi2c-cb : wmshpyx*mt4xfons each second. The frequency of the q 2ff*5p8cc*h2ms( ti pypxe4x -wmb:$emf$ 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 usedf(qn.6t 9:sjf ifux*z 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 aqf304wpb e) uthat

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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 57 urmjf*e+sh9j (qseer8m+z coil contains more loops than the primary coil theh u+r*sjez(sm87e ej9 5q fr+mn 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 loops than the swa-/fosui y3 .econdary coil then ywia./3ousf- it 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 inxoe-*o ;w6kson(m z0xput

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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 resonanf(:x; e5 qzvx gsh/v0ct circuit,

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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 ideal 9g,q.yx4b */rl z30ijqt jz frbattery of constant terminal voltage. A*zrxt q./9 l,jj0f34g rbzqyit the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor 5 x8ultl; zsifn;0*gware connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the volg ;w*50n8lzx f sl;itutage 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 inductanca;i0xa7r3. *rn,-pd uqbpgyu e 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 wi*w)zgt 2qy6 (eb(jgrf th 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 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 battert43 2giz tc2jyy. The time constant for the circuit represents the time required for the current tc 22tg ijzy3t4o 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 az:hr ,ag 2;kqare connected in series to a battery. The battery is gqz ,k a:r2;ahsuddenly removed from the circuit. The time 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 samerj -rr8h d jtzll7v j7k(t;pba:8,mz8 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. gd i -5i i9f m)oppg2j6as-g3v On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power suphdhssjob7 k ;0ms,h42 ply. In this circuit, the currentm b4 dssso27 0hhkjh,;

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance4yvt fd)wtq )7mzb .j: in an ac circuit changes by what factor when the frequency is tf4:bdm)zy)wvjt7q. 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 indunhy 7dtkky-;zex.hivj1 j3/( ctor is doubled, the inductive ey;73zthd-ixv j/j hy(knk. 1reactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC volk*fcpzt xnaa06-v36ikye( f2djc 9:mtage across an inductor approaches zero, the inductive reactan( dp0aza3k*y9mk :- f2c n ie6xc6fvjtce 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 -f8 rod2k nrq /;ki3q qg )c mfh2bkny8sd:v04to an AC power supply. In this circuit, the currehr 3k4dko) imq8nb-v fqdfq2y0: 8rcks2;g/nnt

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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 byadk54)b am;a v what factor when the frequency is tripled?5)vm a4adk;ab

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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 voil p) ff)aq *ny gzi446nv,j.jltage across a capacitor approaches zero, the capacitive reactance of that capacitozgaji)fp4ql *.4,6if)vn njy r

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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 angl j3+2hmeeg ubhj kcw,56n:f, te between the voltages of the inductor and capacitor in a RLCuek, ,ew56jn ftj+:hcgm2bh3 series 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 an4-7k nu6spi4pu26 nsy- di jtj RLC circuit 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 the circuit r91:gu(qf2: ehamljiincreases if R increases. When is this statement trjul :gaq mri:f (1e29hue?

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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 ci v6iznx4q)mh/rcuit 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 in9h9kci y,dv 5i j(s)pmpedance 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 doubpr1q-r).h*,ogsrg bv le in an LRC series circuit, the resonant f*v r grq. )s,r-ophg1brequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circui abkzfkh0 a ;pe/91 ,9/pqkltat that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circu0xsq4c5i-dw fqf;u *git 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 e/ j0k,hqbh /uin 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 paral0k/,jh hbuqe/ lel.

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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 rotae:rao6v mn9l.+ f p0u-gln2*turhr lh- 78lckting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the 9lplm l8nl+hh * gt7ou0cnv2f6eru ka--r:.rmagnetic 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 rotatigz* xjrr 1-ce8ng 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 vectoc*-rr j8xg1e zr 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 8eohzr .-op4qtpr -h fz28k,afrom $1.0 \; m^{2}$ 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 chep+5u34i js)u4l w r tf5.6xtsge +z,s2lgaqtanges 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 squars bx,dl0 ufdf 6l4y+2ne frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of thslyfld d,46+xb 0fu2ne induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area g3;krv jp7g+v2k*tfx 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 and65xtc h i+ni3 rjmcml,)3ch;w 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 horizontallho )mpd 1dr0l jeqw-cm jq70:5y at a location where the downward component of the Earth's omqdcj5wrj-p1qh07 e)lm : 0 dmagnetic 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 angulsy; 5q)osyf/ rar velocity of 2.0 rad/s about a vertical axq/s 5;yroy)fsis 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 loopsm oj0nj -.qy5l 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 consistt kl2dio2xu wu+g 74jf34mw8cs 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 28 u9lguxkb9 6o6x ;rkpn7s np7fw* pl80 rectangular 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 in a uniform magnetic field of 0.30 T, which i9 nu8xsnlp67k r; 26gxl 9bpopf*u wk7s 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 fae mrnm. wf2p2 :,6yb100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with6uw-jl 6d ap7a an output of 12 V maximum when rotated at 60 Hz. A magnetic field o7w6aldjpu a 6-f 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 generf+mxryd xq7u6k1*le h*b(yl +ator 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 h,i g 9)hrin )jvmmog02ave a resistance of 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 mt z*q)hahftb*n x 3m/)otor operates on 120 af3m/**)qttzb )hxnhV 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 gg9 3urq9x e /wjred17power supply. The operating current is 1.0 A. Whree37gj 9xg1ru dw/9qat 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 connected to a 24-V power xg, 2h 50*w/kan c7bbsdrvx-fsupply. The opera-vfcndwh7k g2 ba0rx5, *xbs /ting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pop1icw:yfkr 6p 5t eb /t)*,dbgwer supply. The operating current is 1.0 A at full speed. W: d tgrebw/156 ckt)pyp*bi ,fhat 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 transfor;dfmqh(3oup9 pec 5b; mer is needed to reduce 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 flow in the s-f3o+: o .smzj qh:*bsbxlu wurg3e-,econdary. How many turns are in the seconw*ou- zsuj3:sg.-:rbhfo 3,lbq +x emdary?

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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 tu0 pw:8eef rz+urns are necessary in a 110-V primary if the 24-V secondary has 100 u p0e8zrewf+:turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consixxdoh y0o/g t/vzyfv6;pl9/v gp1.wz72 ro:ysts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in thw; ogxz16 /2t gv:x pofyvy7 /0 vroh.yldzp/9e 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 tr4-de c*g7x y/a mx;egdansformer. Assuming 100% efficiency, how many ;x- dcmdg*7gex4 ye/a 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 neonowwa)2gi / r;nc9fdk/htse u1v+;l6wr1s a7a sign transformer provides 7500 V at 10.0 mA. The primary coil operava shrdk62 ena/ 1/atw1;;ru +sw)fc79oli gwtes 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 s).ue o(0dut s60 turns on its primary coil and 300 turns on its secondary coil. If 120 V atsodse 0tu )u(. 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turo( cl e87ezmhw 4a:e uivo3x8,ns on its secondary coho:ev(x uwi4zca3le87mo e,8il. If 120 V at 2.0 A is applied 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 20u 4rmzks8n+hkd;dtqbxs- s(4 3x/8pu 0 turns. If the input currentss hqumn83+rdztkpdx-b4x(;4/u8s k 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 its secondary has 200 turn 8ewe v:/f+ppks. If the input voltage to the primary is 100 V, we can expect the output voltage of the seconv:e8+k fe/ ppwdary 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 205 cy6w 8jj5:kgwzpvb0trv k: mv+/cw-0 turns. If the poj:wg/+v5zvw 6jvm :k5k8tbryw c- cp0 wer input to 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 V. 3 7tw,* 8wnm0epjgvl gThe 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 turnw,gtwm03pn 8vg 7 jl*es 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 7 22l xphcgwxr:: 8vtm;ij:eh current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmittm :jpl2 7e::; cwxrvhh8t igx2ed through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vo *y kr;ff*8lsrltage is usually stepped up to 4500 V by a transformer and transmitted through a powfs;*l frrk8*y er 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 loh zuyz;*ec0e* j:. rokmnzc9w)0zfx3 ng 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 steppf zeyz;e3uk *cw)z xon c00zh:9*rj.m ed 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 totaj 8s +lbxbps/lz5)c e/l 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 ae + )lzspl b8sc/xb/5j 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 ativu waqkf9:c-i u(cbm 666sw2bkt 09g 1000 V. How much less power would be lost if the powew uv-s6 g6602 tqcim:ba 9k(ifwuc9kbr 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. Itd c(r,iti +.31)oibn af g9exf is to be transmitted on a line with resistance of 0.60 W. c(ofied.)n gx3r i i9+, f1atb 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 much en pz9ifvl. ,xmsoyz6k ; ;m:0zuergy is stored in the coil's magnetic fielfz:yi; ps9., vmozzuxl;mk0 6 d?

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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 y 3h0fnznk5g:inductor. What is this circuit's tykn:g hn5z0 f3ime 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 cir:a zz nu1/o4n/ w2n dgdmqyaf0hdh8 93cuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Wt2 +s*haycqr 1/s4d*:yix l xawpy+;yhat 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-V0:uqd5wiev lcz 3c(t6u3p jx* AC outlet. What is the resistance of the la5i36u xdvc:ce*3q0 uw tzp l(jmp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power sqggth0(pxg 8ao*6c(t )zkgb4 w vp /f,upply. What is the peak current through the resi8g )gb* qhgzp4gcpx /v,k 0f(6(ottaw stor?

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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 j6s:agm t87yyb (igu6; hle8yto a 120-V ac power supply. What is the power dissipatey(; il786y yugha:begsm6j8t d in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W r*3ibtm4 b iabzds4( bz( ti2z)esistor 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 6ph9esb 520vzgip-o f:sk,s acd7cl( a 50-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 resis,l,8tv4;zcywuavhw 6 j1ygemwci6l,3j 0wb1 tor 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 a8.t ;rkhbv4vq 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-mH coil at 1000 H kg69bvsln46u z?

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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 nsw/ c r+780qdiu f*jzinductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactanc.cjds9i ,f10nn fo4hx,g6xo ue 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 kr 5dmgk :e-nz7cv29y rHz is applied t:-e z9ry5gmc7dknr2vo 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-r szt8es5q67h V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor ax )hmr 2f)kto2t 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 capacitietxl xo.k8kq 4yp, z,5ve 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 capaci70w)f v kdvw3v 3r.ucztor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of( 0 ipyctdeb8lumft c78*fp45 a 0.010-mF capacitor be 100 W tt m8ylb8edfc*ic0( 45p f7up?

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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 tht9mk a;zfk1;9p +td nxrough a 0.0010-mF capacitor 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 an ac series circuit wiuvxjap 2 *xi9h5/* 5z h4dxfukth 12.0 W resistance, 15.0 W inductive reac5v p adzxxkih2uf4**x /u5j9h tance, 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 H t*2o,o v tfaaeq/n 9u2c6/envz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected invef/ont a e,6ao2t/vu9 q2*c n 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.mfpj 0h2qyf(6s*axb (0-mF capacitor ar*s pxa206fb(( mhqfjye connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected ingme ot+1akwvk-h rh-1 /x5 :hm series with a 20-mH inductor, what is the im a r +xg/mhk:thk-vw1ome5 -1hpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, mgcvj2nc )*u jx *b.j1what is the phase angle at 1jxccn*g2j*1j)v .m bu 000 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 with9rulda vj 2d 9e3wdqs,qf( :dewjf)+7 a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1 qf)dl3d7jwu fwejs9 +:e(v92,drda q500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resist/vwzw2 i6ko7r: e8b-+isqjbx or and 15-mH coil to ger/8i bbqks- o7+z vi:6wew2xjt a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series witgjqxh2 q,8d 3dh a 450-mH inductor at 5000 Hz for a total impe, 3j ghx8qqdd2dance 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 wit)m 8p4mws/t;j tm vt2lh a 100-kW resistor at 1.0-MHz for a total impedance of2mj mtm8/vl;4) ts tpw 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 j+e3 qc+ih(;g j /bmszcapacitor. What is the impedzh bm(;is3+eqj +c/gjance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 ku5b4-lqh 2ei, *x l)hkrn8q:bo8 qexcHz for a total impedance of 45 W 4lrb-ne :ekcqh)ih8ob8*5u l,q2xxq?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neede gx6pvpe;;laqt/vod4 v s 91)ud in series with a 10-mF capacitor at 1.0 kHz for a phase apug d)q;plvov 1 va9 t64e/xs;ngle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz fo ;op8)-o o5kkau)neau r a total im)kea;oanp uko o)-u85pedance 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 capac kru;w2u sa*(ritor at 120 Hz. What is the phase an;(skaw 2rruu *gle?

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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, 2y/.z ez7/6yjhf et;2wsq e(rv 0-mH coil, and 1.0s.2 feyzjhyw/7 vezrt(e/6; q-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitort t9xrq+w x +mtsu71 xyh 6dbnj35)w;g, and a 0.350-H inductor. The cirwm 5r9t1qw+ d3 xgth+)y76tb nx;jux scuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of caz;o112t ;kzev e iw+bhb/g q3cpacitive reactance 30 W, and an inductor of inductive reactance 30 ebcw b1z z+k/3vg1ohi;2e;qt 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 containing a 50-W resistor, a 3r+yu6/nelmk)pf3d g 10-mF capacitor, and a 0.4lg3de+y3rnp /)6m fk u5-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necess1*y9qu:qo okd ary in series with a 500-W resistor for a phase angle of9q*k : qody1ou $40^{\circ}$ 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 Rczlu+dc t o8goe3:8c*ur,)cu53zurs = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power trsl eu+ zdc zg,*rc u)t88ouo3:rc3c5 uansferred 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 resista fplwb* ww:e:1pc41ewnce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conneflc* p1::w 4pw b1wewected 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 c95.l)o6( 0rargim sjcec:fstircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. Wh* ,afz)scp 8c3fpj/ sgat is t /f*p,g3ccsjs apz8f) he 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 f hpj)vt y9d7a1or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectey j) v9d7hp1atd 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 resonantq32 wf4.be nw llm0fq9 frequency of a 1.0-mF capacitor and a 15-mH coil in series?9 f4 mnb.llf w3e20qqw

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resek0 mr.3 nj3gk*q0qu eonant frequency of 10n.3*0uqreqm eg30kk j 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 fre zhzpb3uyi ).(que.yu(z)hz3i bp ncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistorig7m-)zr x.5jsk0 7s9a b2 lbrffktm8j1 e; ca and a 40-mH coil if the resonr7)gs1 -fbfj b a;z7mext8k jlk.29asmirc50ant frequency of the circuit is to be 1000 Hz?

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