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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 are units of magnetic flux87 ne4 jh*vlew 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 states2n,ifwir 4a v1y45byc 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 lo )fvll 5:goymd8a 5z,mops of wire in a coil produces what kind of change on the ino58d:fll)5v mmgz, yaduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produce.7nng py kxsh0)k/x7hs what kind of change on the inducedg0 nhshp7kyxn.)x /k7 $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on -,78ftekdda9 b kbo*mmy 4 a5ythe indue *5t,okkd 4bmy98 yadb fa-m7ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field 32 owuk/q4b/joo kp;nan $emf$ 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 indlklmj4 yie-(ch( vi*0uced current in a conductor will b0(cli*eikm( v4y -lhje 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. * wd)wke7 zs68xjf-v,7 lm.(vinbdj p A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from xe(s-n.7iw7)v * ,m8 j 6pwdkzlf bvjdabove)

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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+4rwiu16.s1d 8 l c dxkaudw(q is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet inducewi 6kc1l1+u d sqduwd84.(arxs (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 -0c8 x;usrelm in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, w8mus0-c l r;xehat is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magneemharb )g69y4ibu,71lh1j gt tic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is h g7 6 9b1y,hu4r ti)ea1blmgjthe 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 the magnetic field 8/a 4lo/p: uejhp1u,o 3xwv cxpoints st lu hpw/e1uo 3xjvcop/xa 84,:raight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an everz3c(h kxl 5 -4oswvxa/-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the inducedoa(3cvxk-5l h/4 zsxw current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. 9 +:voadk1rbo As the north pole enters the r1k b9o d:va+owire, 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 speed about an/ nlu n 9faj+7h1kntk8)j he5i axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the ij7+at) 8i f5lnnk9eh h1knj u/nduced $emf$ 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 spi3wfg4qln kq,4m j3 *jeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight downg k3qjnw3imf*l, q44j , 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.yzimt /drr9 7nmj8 j,+f 8.tte
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an ha4 u cnwybbj:38yh/d 6bqk;b) 4ac7z$emf$ 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 maas;5owl a* t-ngnetic 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 direction) is movefob3r81qa ; x w1gzuz rp.62q.o+3pyo;b nuwo d northward at constant velocity through a magnetic field that points stgowprbf;o;zoyp .1ux 2q + u63zaw18.3o qnbrraight 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 angulg8oyet 9r9v70yunl9t3zj7 yj 4n z)so ar 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 generatorfwro* ;a65e t.0bj/)sez memy 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 s:,(coqa pdx- lmi+ -zkecond. The frequency of th-(: lp- az ,+qxikmodce $emf$ 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 usx54rw ;xos;8dyb ce6jed 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(g7(z3tx u+pldoqe t, 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 lz zufdc5-*1 vg8b1jisoops than the primary coil c*8i j f5ud1 bg-z1zsvthen 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 secondary 0z43s gy+6r5zcx y0irj n+abhcoii0acyz bs+x+r6z3h5 r jyg0n 4l then 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 pow3i/y73;aq cwg:zazz aer input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circ uwq. ;k3fyy jhzd+1c;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 arasqc* (m/jtrqk 74gb5e connected in series to an ideal battery of constant terminal voltage. At the moment contb/* qsmka7qg c45rj( tact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series toxm qaakdq; (.9+rh h1b an ideal battery of constant term(qadhbqma;.9 khx r+1inal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conni :9o o*uhrff vhz(3p0*ahb6 /y.xe laected 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 con )du m0sd) 3)nff5zrhcnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The timeyrawv zrx2f(hfize+86 b 1i88 constant for the circuit represents the ti8a8vei x z rhf62f yribw+8(1zme required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The v68 trf +xt qx qo7-hjbd7j+0vbattery is suddenly removed7xr ovvd x0ttjqh6+8j+bf- 7q 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 same unitss+k c wn.(pk*ztl3/gh 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 nq wo(hyabe ,q;5+7vwx.3juvpower supply. 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 pow o9p*zcr9e-44oj2- z ruq tjnser supply. In this circuit, the currenz44rnos o 2ec9q*uz jp-t9j-r t

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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 ca8j 1gf-/ kntaircuit changes by what factor when the frequency is trkj a fg1-ta/n8ipled?

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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, the in g;gt5 znh,s3nductive reacgnnh 5t3, ;szgtance 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 voltage across an inductor approaches zero,5z1uv.n, m( y 7h0di7ppjqcgf the inductiv mp7hfjp.0ng7qvcz,(dyi 5 1ue reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit,p n)c7nzu3 cf*14am bj the currencb7c*)3pnmuza 41j fnt

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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 fle:bjduag; )5*5b0 o vnjm h*lactor when the frequency i ml)vb :5bg5n0*oau h;djj*les 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 t 9jh vad -xk9airs v5k538/nxbhe AC voltage across a capacitor approaches zero, the capacitive reactance o x 5 9kai-r85x9a3dj hsnbkv/vf that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of thw73jswuinojs)g . 26 ze inductor and capacitor in a RLC series cgsnuj2 6o.7z)3j i swwircuit?

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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 defin3 sgjnq5cuce: +c*)b2s:, ,c qifzqmped 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 circiaap2+hqz 03st* gc( wuit increases if R increases. When is this statem 3 i(*waacp+0hzq2sgtent 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 pcqsa m( gdps5:ca4,9ggwv5( 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 civxrjedj1/5 qk0 ;bo3u rcuit. 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 capacitancem z+z ,7smm2le0dvw) r both double in an LRC series circuit, the resonant frequency of thatsm0zl) m,+d7w2ver mz 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 2n j;s:a)uibk 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 cir2/e xa 2+8apd;mfd 6ri:ashi lbyhd0; cuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field a;ov.clpc ,pg -1g/i pof 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vect og/cgci.pp-pl1a, ; vor are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0u 5)tb 2nueue6c/ fu,ejqqx6;.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the ltb)e,/euuqnxcq6u e2uj;6f 5oop 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 uniform magnetic field e 12 v q3uf /avmc tc+5,jlq;8wd/ksuuof 0.20 T. Find the magnetic fllc/u2uufvv8 5 3m c+akqsjdetq w1/ ,;ux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop iglqe ikrl3 0k62 vmz((s 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 chancv ep(dk2dp qvh0/3u 1ges 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 frame wi4527q 6fqklyqj xk2with sides 18 cm. A uniform magnetic field is applied perpeq l 7q4kf6w2jiqyk52 xndicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an cxcu 1h,dhs;+.y 6jwbmt6;xy 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 jrkl,u*s8 mk dn;gu01nd 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 horizontally at a location wh2itucz2gd oe r3 t88f*ere the downward component of the Earth's magnetic f8 8tzfgo t2euidc*r 23ield 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 e( k03pn/-l8y+rrk ngnmb/bxc 61 d jmconstant angular velocity of 2.0 ra0 n3/m/r gk6 ylbmr-8ecn kx+bd1n(jpd/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-5; u7xfok3)iq,x htzrsectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ojv r4p 2u e+hrwa/4a5df 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 armature. Each loop i4(w 3u fen(.atgmmc6t vbb3o9s 12 cm long and 8 cm wide. The armature rotates at9w3m6(eu.nt b4a obvm3fctg( 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire f0cxqb(pt)kqe+ . (, 5ahx 14sxi gohjj4c;irof 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 3s ,(ms( fuqfbgenerator with an output of 12 V maximum when rotated at 60 Hz. sfuf ( (sb3,qm 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 generator with a maximunjjhfc(au-z+9 2+pj lm $emf$ 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 hgd9low3:p i.2 6iorb uf/h,ip ave 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 havs7xcbwe*+ dl +e a resistance of 6.00 W. The motor operates on 120 V AC, and when running a+d e*7+wsxbclt 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 tos m 7be5p5pq2n a 24-V power supply. The operating current is 1.0 A. What is t pqns5p 527mbehe 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 sup7nxi6 6x 9d-qxmsz6toply. The operating current is 1.0 A at fuqi9xsmx 66xnt z-7od6ll 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 poe+eh 3cif m+uf5m au8k d0;2mpwer supply. The operating current is 1.0 A at full speed. What is the back dfm58m u+30;faeumechk2p+i $emf$ 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 1swcmef*-5dh2 q0mic 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 thnf)djtf. t *de6k):gt e secondary. How .kt:ed *tgdn6jf f) )tmany 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 necessary in a 1100t8l+wvu*ov4. u aeii-V primary if the 24-V secon0u vie*aot. +iu4v8l wdary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primarulfqd( a(xa-p 0)z 1giy coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current inx01)af-dza i (gql pu( 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 primary of a transformer. Assuming 100%8,rk w.0t)y,ajhusbi. ic+xl efficiency, how mawac ., tj)iub i k.0,hsrl+8xyny 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 provides 7500 V at qy em g8k9jb7nb3jo h6)j3tk 9e 4kzh110.0 mA. The primary coil operates on 120 V. 9t1hkb)yjgj jh48 o39n kb3 q6kem7zeWhat 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 v f9r+n0phu(/:(j, o adsshhdon its primary coil and 300 turns on its seconddvfs(s +,(oaru njph9dh0/h: ary coil. If 120 V at 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 turswr0w3tphl3 2 w8 gek+ns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the 0wtgr3lhp +k 3ww2s8e 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 secondary4f ;iowqgt1 qs: 7zp:nvid w/3 has 200 turns. If the input current at the primaryio ws/4173gnt:; d:vfi zqwqp 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 turns. kv00ur vndd(6 If the input voltage to the primary is 100 ddk0n0( v r6uvV, 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 turns and its secondary has 200 t7q lcit, vfa/x-e:h44 who5 zkurns. If the power input to the primary is 100 W, we can expect the powerwk l ziavoh/e,57 tx44chqf:- 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. The v7waoiwnn kvsp 5a4w/5al ()y -oltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of towap7 v/w 5ya4i)s5(nl n ko-watal resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60ved i/y*lqozin,423sed * p. k A of current at 120 V. The voltage is usually stepped upvis. oze*dnp ed4yi2k/ q,*l3 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 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 ste mkhtu3d in o ,e.+hw2)bjtfx0q*bw3,pped 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 trans*nxm,.tquk j 0o2d w3ti e)bh+f3h, bwmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A ge fsz5a zqu(eyl90td3-nerator 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 (l3s a -e 0zzt95dyqufpercentage 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 of 0.60 W. p4emwdg4iva kc.7loj , .rs:;l/0setA 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 wjc0sde rt4 g .:4s pi,l.;vak7e/m loof 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 6e5u ymm z85ee *ns8hur 53,mkct v3pl0-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 10ku8,mp5y l nm0hzc5tr 38mv*e us35ee00 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 transmitt7;hx: e*5jm r0+s *zigidacpe ed 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 i i xm erchas: ;jizdpe*7+0g5*n 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. H0 oleibes) .nu,:7wmx: fe pl3ow much energy is stored in the coil's magnetic field7:ue3bo.:f)m l, liws0ee npx?

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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 tzpfn4z*f /q m0his circuit's time constant?4fmpn*fq 0z z/

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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 voltageyr+o(hnesn y2v3t9l l 1 ydl(m +mnh4; in 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 into a 120-V AC outlet. What is the peak c qn*zcqz 2n9*a lkqzds. 6z7;ourrent?

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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 12 nkhf3)qh 4l0zg (avm/v+z/di0-V AC outlet. What is the resistance of the lampfnv(k4gz+q )lh//dv iz hma03 ?

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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 conu7w.kdhy*e v8 *.1wev hy1rhdnected to a 120-V ac power supply. What is the peak current through the weyu7.wdvkh.e1y* v*8h1 hr dresistor?

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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 lt/a:+jvqg:/l2kq7-yn yll w ksxm99 ov)qu+ 120-V ac power supply. What is the power dissipated inuqv- :x97 )qq s:lw/+nyl/m lov9k+tkjylg2 a 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-Wqhnvl2g j 78k-aqcr06 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-W resistor isdu,h iz :tq4j cx,9o7u $I = 0.80 \sin (240 t)$. 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,gsb4p. zua+f 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of m/qeln 2wb f4+ iehlq:y83zy8a 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 of5iqn+gimv 2+dg h ,su t.9tm0v 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 ww ;w1rv s8 /g9z0lm)zru*krreg04nnr1 f*gj14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductiv4h: vh ml,7.-kadc88 cuuz rnke reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 qqx0la,4x *si V AC at a frequency of 20 kHz is appliedq4 la xi*,xs0q 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 t z dso/ j7w+ iycg32(sn0spk/ihrough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of j /b(fu7 0 vd,u ejax54+w5yq5c ibmnha 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitis;i5elk,b/byf 2 1ggo6hs e.dve reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a rn . 0,:ro+ulv6bir)q cfr q-abeactance 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 a 0.010-mF capacito efh tezx8g:dj/2nz6/r be 100 W?tzng2dx he:e8/ z6j/f

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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 throug 8ewrer2pd1xil ,m/4 gh 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 with 12.0 W resistance, vnsa v a*ajwcgx8 q5,y:w+fz)d 1bk -;f zu73e15.0 W inductive reactance, zjv)f;*xnfd+a7 qy5w3:e sbca kg w81u v,za -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 Hzpu ;t0d4znj9 n if a 100-W resistor, 20-mH coil, and 1.0-mF capacijuz0np t;n4 9dtor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFc -elb(de +jp)k-a3 6b. nqyou capacitor are connected in series e+q.3)(jdao e-ybknb6 u-lc p?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series w8s,h n lscri,-ith a 20-mH inductor, what is the impedance at 1000 Hzs8l h-ncsr,i,?

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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 w y/4gic;t0;je tz t-lsith a 20-mH inductor, what is the phase angle at /zcj tte4;g ytls-; i01000 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 15xy94 * nepfb1.li)xhf/ k yrs.0-mF capacitor for a total imp h n9/yrbklpfx f).5 se4*1iyxedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series wiah,8wo( gaw4r z5 /ta mxh,to,th a 100-W resistor and 15-mH coil to get a total goht ,rwa m/,,ohw8( 5xa z4atimpedance 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 with a 450-mH inductn 2xv.rxal0zqv-dfa:m7 tu .y)*unp6or at 5000 Hz for a total impedance of l a0q.uxm6*7rzn 2u-v d:)vntpyf. xa40000 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-g cy*k16i1rw:.(yhw9y p(i 3ycn fqkm kW resistor at 1.0-MHz for a total impedance k1nr3 y pi6(9hw(i :w*qkm. 1 yfycgcyof 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 capae 43jt*cb(*s j6nbgi ymo//ckcitor. What is the impedance at 1000 Hz? 3ko//sg(ncb*b6j emj4ti *cy

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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 k+zh3(jsq u ggkzkk6xewy;2/; Hz for a total /wggx2juk kez36(z;ky hq; s+ impedance 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(:ua m a)pmw,gl 8hal/xo.o6r capacitor at 1.0 kHz for a phase angle of8omh, pllragm xw./:o6)a(au $40^{\circ}$?

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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 for a totp36.f- *h:.zprzuppfph9 ja a al imp ap9pj6h p.h-z:zf pu3ap.rf*edance 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 capaci /c5*xd1 t dro pk*e+l:fnm6phtor at 120 Hz. What is the phase angle?+n6frcepk 5/ot*dmp l: d1x *h

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, an1kbgh9* kqi7e 2dj y*fd 1.0-mF capacitor are connected 7 bhijf *dy kg1k*eq29in 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, a)fnkf-,rb7ni m 0 ne1xnd a 0.350-H inductor. The circuit is connected to a 120-V m,irxk 7)fbnn fe-0n1, 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 inductorhfskg: -9saa. of ind f.9 saskg-:ahuctive reactance 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 containing a 50-W resi4n;j i0*lzlnl3 lx,wh( +h*q ez jqfv*stor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power3 l,*j (lhh*+q*0 xnzf;lz qi wjveln4 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 500cw- 0w3vmunnyeez 0 q )e9(vvsd ),n(g-W resistor for a phase angle o y0(nw (0esw3zvd)vc q)9-e e,numv ngf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequentd: +jgl ;0ewqcy should jet;gld0q:w+ 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 an ac series circuit with 12.s l 6ndeph9/u-0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when 6-shp d/ne 9luthe 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 circuit ishrt: fuhu4;8, onz ,ef $63^{\circ}$. 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. Whatkk,j-xswf. rb 1s8d x* is t.,s *x-j dxswb8kf 1krhe 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 ge9r5v gt;3 3(vedgkg circuit containing a 50-W resistor, a 10 ;g33gr 9g5kgt( veevd-mF capacitor, 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 freqix ls +ieq*5qi,qhf7m7sr( 7d uency of a 1.0-mF capacitor and a 15-mH coil in series?qf75*7rxmli is,dehs +i(q q7

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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 gfuh4 g d(*h21 rteo8min series with a 4.7-mF capacitor for a resonant frequeu deg8hr12* hfmto(g4ncy 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 serif22oqfu.3ez2c bm67s rphj v: es with a 3.7-mH inductor for a resonant frequenqshco:.v2zfb2prm ejuf7 632cy 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 pss)pm1zn y yy(zcd3v,3/pq+a 30-W resistor and a 40-mH coil if the resonant freq+mpv3sy 3/z)pdycs z(n ,y p1quency of the circuit is to be 1000 Hz?

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