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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 unitsoo ou -e s0r(3)op x6gvh:tmg9 el(7h ln-p)er of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thmdn4r/g7a:d+ gs825kx wm8ftg,f ba m e $emf$ 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 o)b6 l)w+l vypcdd:9faf change on the ind:+vwf a6llyddb)c p)9uced $emf$, 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 magn ef*. wpea 4h;g88,,cwmxz bicetic field through a loop of wire produces what kc ife8egh;w,4xaz mw. *bp,8cind 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 ig c3i(+m w lqpg3(b8 ;ljz 9y2+ayauuvnduced lb l32y 3+gm 9guvwiapq yuc(a(+j;z8 $emf$, 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 magnetiwwhjx1 .3af c./r):nce i 7usn-,rphdc 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 laob43ppe.h/s s8mqap e xr8w4 ds(.1f kw, the direction of an induced current in a conductor will be that which tende(ppsqm 8 whkx1 dp/ob 4s3er8. f.4sas 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 flael6csv bmd .weq+p84 4t on a horizontal table. A bar magnet is held above its center with its nortcpseb4.l4qme w +v68 dh 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 o6o/iu:mm .j e.mj( 72bi )ahik hmk6ekn a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the ahi 2 (ik.67m:i. bem hkmj6j)u/ko emcoil, 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 tabl8v c/qw) )g9coxj/h nae top in a region where the magnetic field vector points straight up. The magnetic fielc)vw ja) 8cxon h9//qgd vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where thpj7a(l ,cixdstt r2 cu,:s,uh mq:i3;0 il- nke magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction l q3,ri (ku,,cc mu-x2:l iti:an s0p;7jdthsof 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 txtrsraovo8o 8 19/s0y- hj,na:px0 qiop in a region where the magnetic field points straight d-oah:oj8/v09rsit 1x pnx,o sqra 08yown. 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 ever-increas8zr s 1wbn/iyjk,*r5tiy2 f ,sing current northward. Two coils of wire lie flat on the table, one on either sid2szy5s ryjb/t*,k ,f iw18ni re of the wire. When viewed 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 througpngmo /c/nc:, svl42 gh a loop of wire with the north pole entering first. As the north4:mvp/ onn lgs, 2gc/c pole 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 rotated at constant angular speed about an aximmw97o+4hd j rjq.,zss whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of t j9jo4rsd7q.m+wz ,hmhe 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 lx4+qzorrv 3-rotated at constant angular speed about an axis whose direction can be o-r43lr zvqx+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. g1yave5 ;zhl4
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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 e61z */st rcb ;jbt hc)c/fz.zod:xf5that 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 ku hkrcp+ 4,p nr01jz3magnetic 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 northward attep o*.unl4-0x u1yer constant velocitnt p.1x u-ye4leru*0oy 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 aoe1 8prr) sl8- b;-pdth-uzsa constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transa00f144ackl8fhcun 8m 1xlc uforms

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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 th.+hue se,/ xrvenp) +o ram1(trough 60 revolutions each second. The frequency of th t,r.maenupr+(1 eeov/ hs+x)e $emf$ 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 b926h14qgfq-e cdcfvused 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 t dmr;-m wi,5li6g;adu hat

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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 cox;d,r4r9yojc4v /y hycsqkoc 7 29wl5ntains more loops than the primary coil then c 4,5crsy7hoy x/qw yd;or 99j24vkclit 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 secopy4b092 :6k ozon4kqlwlmxa (ndary coil then zyb4l29m:x op lnw a0k( ko64qit 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, thecgp id0 /u2puxt9jz85 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 resonan ,s; ycgq:-mvrt 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 +ab) ;:lj+b 8lq mtihf. gcm2yseries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage l b +8ijta.2)gqm cmb :h;lfy+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 aruv7d/gpn79;+r d4pr f uwmq1te connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage adp4w7u9tugv /qfdn;1 rrp+m7 cross 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 connected to e6 vy;fe80n u c,tdz t0ezh7x,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 con9 jiwr(8 q3m.a-feh ernected 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 tok+jau ;p, f7h p)rlm*o a battery. The time constant for the circuit jhk umopf *,ralp7;+)represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a b2o *14: zykkr jc8vp9a tik;moattery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the pcza24;ko*:y m 1irkk8vojt9 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 samevwx 5h.i :9xtqba;dmxr9f3-k units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit,j38b2tbuarbhv+ *;9 roq uw8x 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 connecteglef.,jyk c-) crzu 1.d to an AC power supply. In this circuit, the curren f1, rz.)gck cljy.u-et

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by whelbnin687( no w4:ug6dhd n7zat factor when the frequency is tripled? 87b7d:4(u6 delnn hwn6iognz

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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 vohqd* h5cex:a)tvbptwx 0y)49 u:4luvltage across an inductor is doubled, the inductive reactanut0 ebw*4v)chxq5)9: pvdyla :t 4u xhce 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 a/2afhg+m 5hw f ;edtf1cross an inductor approaches zero, the inductive r5t;df+ma 2/gfwhhfe1eactance 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 ACp.0 r4fcu62 so *hu;f :hbxxsp power supply. In this circuit, the curre2:hfo0 p r*xc6pu4hux;.b sfsnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reacthun as 30r*lzjz)r4w -ance in an ac circuit changes by what factor when the frequency is l*0hwnsrr-uz jaz 3 4)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 1/5fabpksjpdqd ;z+(fh) xa *AC voltage across a capacitor approaches zero, the capacitive reactancd*/z1a +xh;pkfafq)(pbjd s5e of 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 the inductor and capacitorx. wcm.gmlb/0 urvn8, in a RLC seriesb0.8.r/mlgux ,m cnv w 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 an RLC cirqhen*o0j(m 6pm2f 9qz cuit 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 k:kv3wnzq 7fw fs0i+5fnz4xn 4:jd w;the circuit increases if R increases. When n4k0 znk sqf:iwz+47jw3 f5f;n v w:xdis this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increabfqo8jb,24d ybiv96p ses 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 vn , :jpq3 -u:suwsdpu +m21q5.lzbb jimpedance 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 jwh pt9mj a8fwj 2unpj:i))o;+p;r -ocapacitance both double in an LRC series circuit, the resof j pa r)89pw ijo+ju;nm o2;twp-:h)jnant frequency 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.m qgn;ij ef-p;(ozo : 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 hts 2ttb u.5is)+/tkj RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fieoorj89i i-vn9 ld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop 8jo 9iirn-vo9 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 magn li95kiiv 3f ul.ag-b*(n/xdaetic field of 0.20 T. Fin* 5u-9 (vx/k 3lai ldif.gbnaid the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.1n -2kt:q hktv+y ke-fw7fp :/w0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planeqeyvfp-f +:t-2ktnw /h7 kw:k 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 ka+y*(tsd (clv 7 5p-7clr rgsloop 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 coint+zrfos3 1l5b/8 vih l changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square fra42ttq pt 4)co 0ysn+xa6 qb.qw)mrjv5me with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of+s46c20vn tq.5rm q w))tpb joaty q4x 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 1518w0 evlyv- us turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and arsdjk:cd y-6tk4i k3+en3 ofq :ea $0.20 \; m^{2}$ 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 whe41uokiusldqpeql/2-f/ ,j z4re the downward component of the Earth's magnetic fieldq-2olpsqku1 l/4iz ,d4j /ue f 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 ;b nwi5*esb .zzrdj:6a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a c.w:n es65drij;zb *zb onstant 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-sectional area ofza )1os wk,b5x $0.25 \; m^{2}$. 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 turns1ed8k:k , omt09 txeid of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular ln mf0ny7:pk 2aoops 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 magneticanf2:p7y km0n 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 oftr1n1- ;6d+vvj n/ye /kpor3ja lakx8 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 s aw2kyb4 r:4saimple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available.y4sb42:rkwa a 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 wit/-8i9fielevm x 1*torh a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor oper 19rmz 2nwuc)xates 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 hexbmny hf;l +yy/2.ink 3c 9i1ave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates akn+ ymii ey f1y9nhx;l/2.c b3 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 power suppl wshb//sa)yaep5.ofz+08eh wy. The operating current is 1.0 A. What isoeea/f5phww 0z+ )sya8 sbh ./ 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 resistzq4j v;t. 3:dg vtny+aance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speedyd 3n;j t+q4z:tv.vag. 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 powe*ifeeby7 iw0,,fvm: mr supply. The operating current is 1.0 A at full sv m*bi 0ye:,,if7me fwpeed. 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 needelxj-kzmnq5vwycop /:n:s3q)r j ; ( 6dd 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 tran t:5 xunqp9p5osformer causes 14 A to flow in the secondartnxpu :9q o5p5y. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are newfnpqh1, o.e5 cessary in a 110-V primary if the 24-V secondary has 10 1.nfq,p weo5h0 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 prive67l cps(o f )5nbgyz )7mjk*mary coil and a 2000-turn secondary coil. If the current in the secondary 7mn6 5eg( f))jbcy kvo*s pl7zis 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primaryyzl ,(f.c47 4djm vuodno u ;x0r*bg(u of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow l(44duov,cy(*. rmju 7zbuo0d ;ng x fin 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 )awi hj6b(m di+ex :o(10.0 mA. The primary ce6o i : )wdm(+ba(xhjioil 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 has 60 turns on its primary coil and 300 turns 52eg8:e(j,-rk ms couf q0xdg on its secondary coil. If 120 V at 2.0 A is appliedds,( er 0gfqx:mcj 28kue5o g- 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 zrb-j1y7;cj6ao3oha and 300 turns on its secondary coil. If 120 V at 2.0 A is applied t1 z6or;7jo3hyajca-b o 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 haso*oia v3q6vr / 100 turns and its secondary has 200 turns. If the input current at the primary is 1003 *oqrva i/o6v 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. If.i69t2pjx)qigoyr 6.7 hcz l2u. bwju the input voltage to the p ocbx9lu z2yhi.6r.j.7p6gu tq)2iw j rimary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100x,gp u:qx4(dg turns and its secondary has 200 turns. If the power input to the 4d(:uq,pgx gx 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. The voltage is usualf1kud6 je)2y vly stepped up to 4500 V by y2dev1 6 )kufja transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepl qu:: sod)9ld4x3m eyped up to 4500 V by a transformer and tran4o dm9lq sxuel3)::yd smitted 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 120ma4:r(9ft edz j v6 2iprc8g8p V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not spc2m: a(ij8d6r g8 e 9f4rvtzptepped 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 line6q62azs9xo ln 50 km long 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 stepped up with a transformer with a turns ratio of 100:1. o6x aql 2n9sz6 What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total r d x6f .sw-1:thbacm2eesistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of :fh- ms dc be6.tx1aw2the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is 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 imoyf 9)w)hx.m c08ludown a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 10oyi8lf0mmh w c.9) x)u00 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 transmitted on a lizh-l/tskp6- g ne with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer ip-k-6g /lz shtf 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 carrie 5nfith.g:,-da yg:* jao5lvb s a current of 5.0 A. How much energy is stored in the coil's mai:hl.fa:dvb *a55 oy ,gn-tgjgnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contw eky09en ja. whw6yz 479zuz8ains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constant kwyz8ye z naez4u7j60hw 9.9w?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit whebd20/uwst.4n;tc yzw. bh -kere 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 :gi0bm+d3 n7ahacqo7 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. Wh4h8(n hk, *6fugf0 mhgrb/rmdat is the resistance of the lamp? (h g,* 086 drhrbfgfm4hmnku/

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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 a(rm mcz6:zttui1d) v)aa i*5lc power supply. What is the peak current through the*va d(:z1u 6))mizrt i5cm lta 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 y//9 uwz:e9j)j 9-zngt,/zez u eyt oppower dissipated in the resistor zunt/y9eetj/jo99, e:yg-zuwz)p z/?

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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 re-pmoto ; ,2dy.usit)osistor 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 resiq 4cobi5 ljf+(xpe *h*stor 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 resistor i 383az1a ywcoss $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductof vhjh9b, iuao18m+x ei+9:r dr 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 10. sx/qo;cf :po00 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of ind,xdo 15faz*b bbo1wzd/z0 nn4uctive 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 reactance at 1000 Hr x+,gg;h sgi3 dz-f.qz?

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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 ;u;mz 5r,,l 1pba*v2lqtectpat a frequency of 20 kHz is applied to itlae 15zr; bm2;pc* ,vpltq ,ut?

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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 cel2f mje:w3g93mrm 9(i8 w8-bcq dwpsource?

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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 r/r tsu xyse 9j+yz/0ozk. n2v0m.frg+eactance 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 reac yscw7a9ul;i 9tance 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 w yfl(;xb0avu0n( *in a 10-mF capacitor 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 a 0.010-mF1d6vfee1mfj 7 capacitor be 100 W?dm f1e71 6efjv

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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-/ kbv;z5p sq5tp:p2 ijmF 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 circ rmi/9 g/x)ixsuit with 12.0 W resistance, 15.0 W inductive reactance, and /9 ismigrx)x /10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resis)ol n4zbqcm 0n -.vwm2tor, 20-mH coil, and 1.0-mF capacitor are connectebm-w4.n)mq2zcn0 ovl d 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 coioi2n 0tl:xbo7 gphp o.z/ri :;l, and 1.0-mF capacito7io/g: oop2; ihznl .0prb tx:r are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what isr;iog tck +y +jv5(c3c the imperco3jk;y +cct+vig( 5dance 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 seriq.m0qh r,fp /)9mgxnyes with a 20-mH inductor, what is the phase ang mhfm q/ py,q9n)r.0xgle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF czoz+ /7g ie)eyapacz7ze)goi e+y/ itor for a total impedance 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 serieshi2u 0bl.bg) c with a 100-W resistor and 15-mH coil to get a t) .uhgbc0b 2liotal 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 inducto :a)xa90ex0l av )*flvktc )znr at 5000 Hz for a total impede)a za)va0f9:lxk)0xclt v* nance 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 u/lzek+d+ 3 wjf-2nyt 100-kW resistor at 1.0-MHz for a total eunzf+3 y2 l d+-t/jkwimpedance of 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 connec*r7 6kvlfk6h mted in series with a 20-mF capacitor. What is the impedance al76mk h v6rf*kt 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 kH dk 1t 2;d+0bs/gogpohz for a total impedance+2 tdgg1op do;/hb0 sk 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 serievy( hk.5*uxlfs with a 10-mF capacitor at 1.0 kHz for a phase af (y*h5xvu.lk 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 resisb,np0 bj fgz77kr--eh,*p jpp,dq xo+tor at 1.0 kHz for a total impedan 7pqjgzh7 +k,0* nbpej ,xp, -frbodp-ce 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-9yn0 x brwkl9dp/ 9rx series with a 100-mF capacitor at 120 Hz. What is the phase any xbx9lw0kr r/ p9-d9ngle?

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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 1.0e+v1tp0 rjns n4 )4sph-mF capacitor are connected4+ trh0)svpsnp4ejn 1 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 10tt/f g-f zm.k1.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-H zff.mtk-1/gtz 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,eto lz9(;gg c+/ xblrs*ir)*w a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in ser9+s; c o/br*ltgg)ezxr(i *lwies 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 RLnink -xf; 1h8zC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whfx;1-kh8i nznen 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 a 500-W resistor for a phase angstks uwo7dyl c( 2a;ga -6fm:+le of :6aa; s mducgwf2l7(ok-+ s yt$40^{\circ}$ 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 wha 8txl;jct*+ z:bxoj0vt frequency should the circuit be driven in order to have maximum power transferred from the driving so+lj zv0t8 c:xx*;bjto urce?

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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 anbaa4kp 8kukyg0 92j/h ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W kaa 2 89j gp/uhkk04bycapacitive reactance, 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 x+ ea4o+wdxn9 AC circuit 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 imh :6 n(f,rw*rfegva-t4k un/bpedance of 60 W and a resistance of 30 W. What is t,/v4rk(-e hf: aungf rw6t n*bhe 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 containing a 5gd- gx- mzn m,uc(bm+1 (h)fld0-W resistor, a 10-mF capacitor, and a 0.45m(,-)xufb+n - ( lmg1m gdchzd-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 freqja(fe j.ri4fiz )3wu-)r k- diuency of a 1.0-mF capacitor and a 15-mH coil in series?r .-irwe jzi) ufa j-4f)dk(3i

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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/u frzrt24 bbz1vf9r8edq sm d72 (.tb for a resonant frequency f eqsd7/ (z9d8vfrr br. 2z42utbt1bmof 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor fqd(2 voi.sw,f /pv gq-or a resonant frequency of 10qg, vq-d .(oviwp2sf/00 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 pqk2hr:.36dn )c ehcgm laced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1. 3kcd2 qhrn6 meh:c)g000 Hz?

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