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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 flux esv +d/zn u swqpjfnlnouo51(v(; 58f (xcept

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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 induct 7va4frj aym::ion 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 produces what kind of change on o pet8 dcj/l(3thd(8o tj/cple 3e induced $emf$, 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 prodf(-y*.u/rq( mqp rssouces what kind. mrs*uqor s(y(fp /q- of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the m 7ovrz+hacltu /q0-xe : v9j-inducel9-mazu/ 0+7qojvhv: ct-rxed $emf$, 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 ; r w2.n6s 5t;dh3rw3p smiypufield 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 djox9 3+j/n-gr3x71 l4dixehapdf f j 9irection of an induced current in a conductor will be that which tends to produce which of the following effects? ajnl391/d3fd hxp+xjxg7erfo- 4i 9j

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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 magnemq6umv79rqv 9w w+ 8ift is held above its center with its north pole pointing down. The statv+qv9 6um wr978wm fqiionary 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 magnet3bvpao ) w9 ixw4sw,:l is held above its center with its north pole pointing :pwswa) iwob 39, vl4xdown, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a 29/vx8dd r;f zpr al.eregion where the magnetic field vector points straight up. The magnetic field 82fxd. /l rpv9e;adr zvanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level t3veeg01 xf9 -4o7f y 9pfopeicable top in a region where the magnetic field vector points straight up 9 ofvy1gp0f-fie co73 exep49. The 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 where the magnetic fpre( s(pu84mbs* 5zma td (-ukield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the kt ebus8(up 4(dmsa-r p(z *m5direction 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 *5ickksre e:wfhb 447table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When e 4cre4k* 7fh b:ks5iwviewed from above, 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 wire with the north pole entering first. hqnveqvx :-n9* z qxc8d*w4t-7jnj, t As the north pole enters the wire, the induced current will be (as viewed from98 e*tj*7 xqcn-xj-t h:, qv4zndwnvq 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 gahtfg* 2wl1 1lq yuqh-zdoed* s; 7:(is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform mawuh7qedt*og-;y*g 11z(q llsfd 2h: agnetic 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 rotxy5bv67f /h;h-ebphfw. 1 fg*3avgjpated at constant angular speed about an axis whose dip*vbh3xwa/geb5 1j.6f-; gpfh7 y hfv rection 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 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.3b0xfqk bv:)pn gcy- 2
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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 e+ 6sxwynj)o.that 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 magnet7ev7r tmw .of5ic 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 moved nort1a9rw/ dzrz0v ks5 3wphward at constant velocity through a magnetic field that points straight down. Make a statement concerning tzd0 rz9a p5k wv/rw1s3he 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 velocw 1i7vu;dj0ch2o 3ccx ity $\omega$ 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 generatorghroqy* 2 plkqr7o952 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 su8l/z6rgpk 3qb-*dl aecond. The frequency of thel d3gkz ul/ 6pa8b*qr- $emf$ 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 u+nop3u25 suqy jsu;d+sed 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 l2m z1r(s66utwsupdz 5x,f/fthat

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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 ; kp3wgfqofvo7s 3wz:,0 j-fdcoil contains more loops than the primary coi j7fsk3zp-ofgo; ,3w:w0df qvl then 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 to stj;/4dif o7he primary coil contains more loops than the secondary coil tht ;od4/fj si7oen 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, th uxdyw fxjw5v2),j+c /iu(n1uufd v 7fwa41 n5e power 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 ci5bxv*(g -muh7 wuc23ipz f,hcrcuit,

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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 b-4mk+uzfrfq/84b k ch5r e l)fattery of constant terminal voltage. At the moment contact is made with the battery, rr meluzb/q4 +hf- k c4kf8)5fthe 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 connect)4*uwi/wdn kofwpr)b -yd d .)ed in series to an ideal battery of constant terminal voltage. At ) ./wni4 *uwfw pk obdyd))d-rthe 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 connectedg m9t: 0xgdk.k 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 withnzu3bv lxzvg: z48;2a 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 arv. uejs /pn,lw dty4+ 9jr,g3fe connected in series to a battery. The time constant for the circuit represents the timew+l/jy. jen u 43rfd, ,spvtg9 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 battery isaw0iwa r0h0xk q3d4;y suddenly removed from the circuit. The time constant for of the circuit represents the time required for the ch k4a0wwi y3d0a;r 0qxurrent 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 unizy(p ug7rhq+- ts except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curren,2rv4s ) ryu:gllce,lt

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circui0sat a ynni8v)g:.t x+t, the currentn0.atv+:g8 tynix) as

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanc86.m th5kv kphe in an ac circuit changes by what factor when the frequency ik8 khv h.5tpm6s 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 volta*/,atii qw:,:s ajz lkge across an inductor is doubled, the inductive reactance of twjka,:lti* z /q:i s,ahat 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 rhjj2+ o zm2 k0so5iu4inductor approaches zero, the inductive reactance of jhi0 2okj5ms+z u4r2othat 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 co;p 3 +w ,xjdmwtnwcm+mbm -o54nnected to an AC power supply. In this circuit, the currentwjn-+oct4b5wmmx ;m +,mwpd3

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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 factorl 9l duj2hkr7) when the frequency is jhk)l79dlur2 tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approac +9ymnt e ;v:ikx9t)ethes zero, the capacitive reactance of that capaci;n) 9 it:t vey9+kemxttor

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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 capsbbl 8otozq1 y..2q(pacitor in a RLC series circuz qqy1 ptb.b8oo.s2(lit?

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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 RLC6 0qki,wd)fga*pw r s du29+gsiy72hw 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 tt0m1 w8x) pfa+shng 2rhe circuit increases if R increases. When is this statemet+1w2h )8sfn xrgm p0ant 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. Th 5n;-* ,rlv 7gjsygqnoe impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series ci xb - jv+he/:*y0iievurcuit. 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 capacitant ,gefp6eu c1)ce both double in an LRC series circuit, the resonant frequce t1epf), 6guency 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 circuit that is driven by an AC applied voltghrw ;/4u av r56suel):av uk1age. 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 circuit occurs wi wt3xwls74dm/4-j jlclj1 /ehen

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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 fie,/xh,: f *yj-mcdfsy+jl- bz fld of 0.20 T. Find the magnetic flux through the loop when the plane of tb/ yf:c- mj*d zyfhj-f,, +xslhe loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fieldagmo1ug p(hjf) bo,dtn g sc/35*.av. of 0.20 T. Find the magnetic flux through the loop when th .aa)5m.*pg togon hub scfjd13,v/(ge 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 of 0.208u p;0ymk ztw.y3i phck:0b lone 11g4 T. Find the magnetic flux through the loopt 1ukl0mb: go ;khc n48yp31wy.z0i pe 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 adjustabpa to*rw9;deflt:wertb3 w (9m)t).ile single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chang,w4s .g;c miyges 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 wi l8qdvxfi:l9hu 187hrth 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 tofru :lhldvxqh19i 887 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 ans(ky):3 p cq1yb/sfml8 lkv/k 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 1,yxp, f1xdegand 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 horizonai: 3zu8 ct.u+u5qa lf25kjgc tally at a location where the downward component of the Eauut:iakf8a qc2gu z3 lc+5.5jrth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotatehflht xwt3 2/v 66/30 rhddqc1col* wms at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiexh6ldc ovh3mdl36/hwc0fw 2/r t *tq1ld 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 generatoryj027 mw j*1(i f-sq a5xuljff 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 consists o9,h y:hz4 cli-/ai2un5 kagqif 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 ry clpvjm:iekmh+c;p: s 0lvg;5yzh4g- ,0 u(q ectangular 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 fiegk:e,zmc+ycvq;pv:p 0 0hls-; ul hygm5( 4ij ld 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 ju*m88a 3 uuv4b l8f-brl3v kfwire 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 c 0j tole7tr6(o0yvat0 ik5ld4 onstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic fiet6dk v4l0tero 5a y (ljo070itld 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 genc t-4.wuu)qfz erator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00ejhed* ;fiq) ;)+ ld/guxs)hj 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 moto:laa +,chb 50jzc9w mfr operates on 120 V AC,c b9ljca, f :05za+hmw 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 e4lxpxu7l j+sgl7e r uoy;+( 4 7ew1kn24-V power supply. The operating current is 1.0 A. What is the s r17e+ jlpg4xye4x7e+ ;o( klu nuw7lstart-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 fbp iao)5q-7/.i fy3uwemo0-ssa*mfv+qr +s resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speefa7sbf m+ q/0s+oq-r 5*vi.aui)-wpyosmfe3 d. 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 power supply. Thqfrw.hi/ vlt :7n fr.*2m. ydhe operating current is 1.0 A at full speeiyq rmf.wdh*t:/l nf7v.r.h2 d. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needn zmccv31 ,iy4ed 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+g ,p-sceyu .v causes 14 A to flow in the secondary. e svc+g .py,-uHow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V prim 8n,napako 2wk,/) lcsary if the 24-V secondary has awlk,anp2k, s/o8 ) nc100 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 primary coil and a 2000-turn s3yf ;i+)tsy aougn, ;uwh x+mt: *n,wgecondary coil. If the current in the secondary is 3.0 A, what is the current in u:f+;ny)o,3i,tsmnxw+ ; * hgyguwat 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% ef5z)f vph8 sn(9zfoq7 oficiency, ho(q z foh9fp vs78o5z)nw 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 trat/ iav m(2 .ray, npy3u(oc7npnsformer provides 7500 V at 10.0 mA. The primary2mpptr.i o73, ynuaa (n(v cy/ coil operates 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 hasme ,, +qn efxfsf4, l4l9ncpt3 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A ,4+tn ,fnpfsle4mq x 9f c,le3is 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 primarp3qy0u)dryp9ubuhx 7 mjaqhik * 221.y coil and 300 turns on its secondary coil. If 120 V at hq u2i a. xj3d0kq 2yh7*) r1mpubyp9u2.0 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 d5smc2 0cdl7w turns and its secondary has 200 turns. If the input cur05dcs7lmc dw 2rent 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 txfxg f4udr/q1u, pt -)urns. If the input voltage to the primary is 100 V, we can expecprug1) x/d-,4tfufq x t 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 sedlmf2 sewh43o 3zl5v 5condary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frict3sfm2zv od5lwh34el5 ional 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 at7 sxn4ie s3rgp72d v8b 120 V. The voltage is usually stepped up to 4500 V by a transformer and trad77 rbss2npe4 3v8gixnsmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 6j i .zb.yrre*,0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.eyj*.b.irz,r 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 volta,vy+pt rdj91-o q mx*fge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in t qfpdrj9,+-yv1xmo* 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 long has a total resista4vfa+ uo01h hhnce 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 transfor+uhh 01ah ofv4mer 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,+i.a,)nayn8 kj bquu 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 transyn,a. jnk8 ai,u+qu)b mission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How mp1sdhpvc das )kl.*61uch less power would be losv11*ssc6pdp hd .) lakt if the power 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 aonpczi -4h* g9t 20 A. It is to be transmitted on a line with resistance of 0.60 Wczih - g4n*9po. 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 Avlw8a 57jp xw1. How much energy is stored in the coil's magnetic fiepwla5 8x71v wjld?

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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-Wbh*,kdh og v9;5au e(u resistor and an 18-H inductor. What is thi(; baev9k*huudh o5,gs circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuiegh2e uz 88dev4ln7*nv wug)8 t 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 A6zf0ku-rh pow +4czk ewt(: o2d8tk6zC 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 120-V AC outlet. What is i7c9ghwsjkf a 7d+ .o-at (s9tthe resistance of the lamp wt-das7(ga9 f7tsj 9.ihok+c?

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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 supply. What is the peak 8 j6;ja4vfa zj29opqs current t2v 94jaq8o; jpaz6fsjhrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power disspvgfri7 m, 4pib 9q:9ripated in them9 f4qi,9bpi:p7gr v r 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 rkqy mys2 7cr;*8zq2lnesistor 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 resistorkw ue6+b+(cor g. k hsgk)777zj-oajl 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 k hj-o-1du;g aresistor 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-mHb 5c2l5clh ,ry 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 atic8fw k0ne;;x 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 of1a69 .iidlrem 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 inductive reactad/mddu ol*.dsjq2zq(u5+r t re1. :ltnce 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 195 of i0,muynyz5f*ox 20 V AC at a frequency of 20 kHz is ono5um* z9fyx,5i0yf applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourcp /tp, 2cygc0,6bbwyb e?

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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 reactanc7+ n2yn,iqpake of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHz?fl/w*.j o.qe8g0su. snsub d d 4v,ul8

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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 capacnqo w.:wkwf,1a0mo papz 8 yb,.3,cpo itor 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 capacijp+pn +rqo1xp.n z+ u 3.fvj/itive reactance of a 0.010-mF capacitor be 100 W?f.+vzn./ rjjonx+ p3pu+pi q 1

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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-m4zt6jkyc* ax mh, : trt(+wlk6F 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:rb)i,p50e-ahsjea3 gn hk2 r of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, a a3h0n5-erb:2 jk,hraespg i)nd 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 100cbi1v: o4xjb, /epe q//a: inq-W resistor, 20-mH coil, and 1.0-mF capa cjee nix::/ /oq/4iqbvpb,a1citor 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 1500t8b:pa1 m fxkmd1 7hy9 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriep f7at d1m :9m8x1hkybs?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor(x7oic vr ;(zc, what is the impedanvzci7;xrc (o( ce 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 inductohh6+2 :vu7:e lplvsivr, what is the phase angle al:sv6u v e p2i+h7vh:lt 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil9/i dcucw5e qhb*ifng(j7p7y8, s h,r and 1.0-mF capacitor for a total impee/fbpi,, 5*hwy in jhcs7u7rd8cq9(g dance 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 capacitanco7/ 2v ;e*8zij tvmxxmes is needed in series with a 100-W resistor and2 *x;7z xi jme8vvtom/ 15-mH coil to get 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 with a 450-mH inductor atm x7ghkh(hf-e,n 8m ;g 5000 Hz for a toek7hnhm h mf8;gg-, (xtal 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 series with a 100-kW rbet8;gb(yfkxl h:yji*0 e .d) esistor at 1.0-MHz for a total impedance of 1 y*;8yk fbi0:ltghebex.()dj50 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 capac+c.miv4s f0hll x5 8el1llla/itor. What is the impedance 0 /lvslcxel+f.halm 4 581lil 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 neededz o;dx k hv0+gw96x2vvd3bf r6 in series with a 10-mF capacitor at 1.0 kHz for a total imr3 9w bk66v2hv zdv+x0;go xdfpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor ai7yap2jy+k8y4 re t;e t 1.0 kHz for a phase an ykt7eery2y;8 +jp i4agle 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 wit yv 0xn2wwb93nck4im1 h a 30-W resistor at 1.0 kHz for a total impedance of 45 W?9 0nywm1 b v4knci3wx2

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 s+)n) .-gsf+re j;5xmgqpat j Hz. What is the phase angle?jns a tfjg +e.pr-x+)s)5gqm;

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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, and a e 5f)ut1c4jk1.0-mF cap 5ut 41jface)kacitor 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 resig(8gq ta,:wdmstor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cu a:8 mt,gqdgw(rrent 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 indux.i4cmg)zni 5vre r. zec-/q8 ctor of inductive reactance 30 W are connected in series to a 110-V, 60-Hze8ne z) .zq5/xrirmgi4c c v-. 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, 7 rg8 qr2nj8aha 10-mF capacrj8r872a q hgnitor, and a 0.45-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 necessary in series with q4t1gada: ab(; k)ooi ,9mx kha 500-W resistor for a phase angle oq) o9a1g kxma;tk(i db4o:,ha f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what;i50+7g;ng6trk mepfd5 (maa*u sffc frequency should the circuit0i7+u5t *6kgfpdsa m(n ;5c;f mr fgea 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 12.0 W rer8azgg2uj:; gg f /-km7zqiw *sistance, 15.0 W inductive reactance, and 10.0 W capacitive rfzwg82az/guq-ji 7 ;r:g *g mkeactance, 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 ci2hi 2fxt aqp 2fp*/k v)zjq .6t9u5fvircuit 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 hc w hpn6f( a1- sm3na8-pnoeo(wh:6uan impedance of 60 W and a resistance of 30 W. What is hp8n6:( 1-wh3nas np weo-f 6amuco (hthe 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 conta(5vup(jpz8 ,f5q j ck0*.kt,1qt bigeqgjg:mining a 50-W resistor, a 10-mF capacitor, anzu8je k5t:q( q g g(vb p.tkqjj*g,0pic1f,5md a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1ooeqi, hd h)5ax0v;ccs/ 2p.h.0-mF capacitor and a 15-mH coil in series?o5d,)ce c ahph;qh0x.vs/ i2o

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neededp cs7oxk.rz;. in series with a 4.7-mF capacitor for a resonant frequencyr .p.s;k c7zxo 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 llxhoyc;n, um:pq1)w dw7 sig;g (.0m with a 3.7-mH inductor for a resonant frequency of 1000 Hyiwxw;l.;chu mmo, g s:(l0q n1g d)7pz?

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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 inco-8 *+ fbg3t)3jc w g(ujpxpo series with a 30-W resistor and a 40-mH coil if the resonant frequency of the cipub8 )oc gw+p3ct -jxjf(*3gorcuit is to be 1000 Hz?

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