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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: physics    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 ml e v6ii37/bkk/mnpc *o1cix3agnetic 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 stathp:-7*+e ,offis 1( u sllznmles 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 whatda8n b 6x,ye-u kind of change on the induced,a8d n6ybx eu- $emf$, 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 produpiabkjz jz7ev;w3uh 2 r62rv *e ml.kyc (03t)ces what kind of chahzlb j )i2urkzj6ew2c3v;v * re30m7(k.yptange 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 rid v:wcp1he--o d k7 -8blv)ythe inducevp-o1c-lyw bd red ikv :8-)h7d $emf$, 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 removedbdo pmgvr+0gfg- /g30 from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor wjvjs l( 37+z;1v mp-kefp gzx:ill be that which tends to produce which of the fo:j vmxp7zpgl z1 ve-f+k3j;( sllowing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held jki;s x4b fig549e85s uq 1uosabove its center with its north pole pointing down. The stationary magnet induces (when j5o9s x g u1s;b4fii4 k5sueq8viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above iucdoi)/l smfro . t.32ts center with its north pole pointing down, and released. As it approaches the coil, the falling magnet i3/m.sf iluo2)od .tcr nduces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector lnlv- br2805z)bmfy0 wa- yg ypoints straight up. The a fmb 0)8y-rnly5y2 lvw-g0zbmagnetic field 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 ghn3wnz;f53n4 ew: dyyw w3tc 5 o,la6in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this ; w 5f3nd,n:nww3l3ztgoy5hca6wy4e 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 2(t1fac ;iii6g7alk-u dc v:wpoints straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the inc: tik 7fadwlg(;ic6 vi-u1 2aduced 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 carrc0aui/t0 a bp7 khtr69ies an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of u7a/h6 0i09bpatt crkthe 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 through a loop of wire with the north pole enterinx6j9y-4ifjil rq kxwbwe,g k- 3go(**g first. As the north pole enters the wire, the indowyk(blei69g-jxfji 3qkw xr,-*g* 4uced 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 wire1y60kt:goy;jd)ir8fa 7b) w znvk5po is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetb 8f1wyog pnk7 jrdz);y6i :a 0tvo5k)ic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed a*fza1zp yyuh(w;g7/ vbout an axis whose direction can be varie/yg1z;fp7(u yv*zw ha d. 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..zemgzz k65g r i6ye4/
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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 anq*5fij c. ae8i $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Th7wricojf/1rsi-lr7/om l- q+e $emf$ 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 at coj7q)t4menows2,+fc s c ( l;zhnstant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.t 7z+l,eomfn 2qjh )sc(4wcs ;

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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 rotapf fks5uwz-g1g59 f 4ktes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trar*j/.+)-eesc 2d n p voy1gaqwnsforms

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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 pd 4c kg99:kkot p eg7w3tt1q;second. The frequency of thetg3kpt19 g :kq 9d pk7o4wc;et $emf$ 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 used / pa 9p81ny4 b+9uwv2voxopbqto

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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 deviwr 6 ms7x :5ro7 3cum;+rruaunce that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the pwxh1*ueo34p ry16b i urimary coil then it is4*w6po1 1x uiuyr3h eb 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 jc z+m-auros+(0w2 vp loops than the secondary coil then itpwcmjv2+ s -0(ua rzo+ 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(-fk:n l7hvdy 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 k76nsz, j+ wnucircuit,

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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:f +nwab r,fd7 connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thef+n, f7wadb:r 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 inductorts2ra ) hia8-u are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batt su8hiat)r2 -aery, 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 (3ikjl7/i: wngl 1qq tR is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is con(e*x7t8g8ox ( lnigtynected 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;o;;iwk fanm 9 connected in series to a battery. The time constant for the circuit represents the time required for the current to ;ai;nofw; m 9kreach

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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 batt f;sx7 4fsl+xa0i cvfpn3nz;0ery is suddenly removed from the circuit. The time constant for of the circuit represents the time req7n;if 0 vn0+s4xac plffs3xz; uired 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 + t /z9/pxwdfvunits 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 currentgrl k6p kwt6m e1qty-+2 3.h73oheajl

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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. oawup pnm ipe)63d2b 0hh4x7s2.pt3rqx6+nb In this circuit, the current 2nsq3.3p6peih4nmxro2 p b0w)txuh d67 a+bp

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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 cq dd.xw:4ze*so159 psrog qbt/5h( wxhanges by what factor when the frequency i*ot d5x e4ogz1dxwp rs5w.(sb9q qh/:s 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 voltageh2izj.6bozc7 yz/(z yoq 6em * across an inductor is doubled, the inductive reactance of that ind6.zbyizoj2h7eo(6 /yqz zm *cuctor

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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 thy5so2u2ni i9mzs+ux/ q-g 5yjb0j,b he AC voltage across an inductor approaches zero, the inductive reojyhm 2,x s5/q-ubizy0usgj5 9 +2inbactance 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 .f,s l-vwe1 /omy 4avaconnected to an AC power supply. In this circuit, the curreemv,. w-a4yo1vas fl/nt

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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 factor wh 5d43r5 mx p1xdsejrg5en the frequency is tr553xsx4d5r gem pjr1 dipled?

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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 approaches zero, the capa ucj08h,dky8s citive reactance of tu,8cy0h8dsjk hat 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 vd a94nj+* /mpfph/ zj:wy.nwvoltages of the inductor and capacitor in a RLC series circufawhn/m /jwzdy n4 p+*vpj.:9 it?

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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 cir6 oi,ta7:dw ufb25j7bjm6 yq pcuit 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. 8t pmd4tr9q *x,wee ,f The impedance of the circuit increases if R increases. When is th,mw4q,te *p e89rxft dis 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 increasesrm8ia.f /.dmj 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 impedance of the circuit increases i7c.ckwc sxb6nq+7 m) ag .q*rif $X_C$ 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:1n o2w) .l.dp*mn yxpayuw9 p the capacitance both double in an LRC series circuit, the resonant frequency olymn*n1ydx)pwp a9..wo2u: p f 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 a tiql;fh 1xvfmo7,3o6 pplied 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 circuit occurs wko)y 2z)53 kk9p6gz:l katr-bq* xrxg hen

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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. 58j ce2jadx:jxb+uk 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetj+ujd8 .kb 2x:ejcx5aic 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 r:wr0+8(n2aiwobx wxj otating in a uniform magnetic field of 0.20 T. Find the magnet w 0(oxjx:28+wir awbnic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is r dteno ,/v :(;oq 75-kfyeyscbotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector a:-7vftcdyqk en 5eosy b,o;(/ re 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 swy ws0jc(z ewza566 9adjustable 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 c1svd b;q/7xni/uhcn , t*2wpx(7vu:n fw2bnaoil 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 frame with sides 18 cm. A /,a0k jajt8c //2ch/zs xlrk juniform magneti/kj2,k//c/0l hr j cax8sa jtzc field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of 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 wi7 q2b xwnycof7 3gh38sth 15 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 a 7vz oq;zopb+n74 al3irea $0.20 \; m^{2}$ 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 w 4nq.6+cdoerd here the downward component of the Earth's magnetic field idrqn6d.o4 + ces $6.0 \times 10^{-5} \; T$. 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 f2c-1rf ur k(fcj7rd) 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends 27ckjf d rr)ffr( -uc1while 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 50p6+e;qfb)f a z 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 of 100 turns+p dn9 f1d4mdjim+pm4 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 loops on iaws hm; hw0 y-o*f)cv/f5zy -xts armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum ouoa;-m ywff*)zhyx/wh 0s -5 vctput 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 of area gv oimf87+d 0q$0.090 \; m^{2}$ 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 constvax+o tw 1yjt76e h;v-ruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area h;wx716 +a-yevtv tojof 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 maximumk;x+q7y errzk5t )6 cr $emf$ 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. 6,)p2 pkb joipThe 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 havhy3vnm4o. j. se a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full ymv4..hs3 njo 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 connekeh)q*kuh8.9,j ; e/ npkg5y- awniso pe6xo,cted to a 24-V power supply. The operating current is 1.0 A. What is tk5qko9ik) e6 so,. yg/8 ,p- nn;*hawp eujhexhe 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 supp pa48hd dj s.8io b(6at/m-wjply. The operatp.4aojw8 a8dhtd-p6isb( /jm ing current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W i. w dc5:cp5k4t6v4fdwmkoe i; h/wk m1s connected to a 24-V power supply. The operating current i hdkik54 w :em1p.6wmv;fctd5ck4 ow/s 1.0 A at full speed. 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 needed to reduce a primary g5sji d/;2n8w,qpgjh 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 gusn m2/upgo0+2z; zhthe secondary. How many turns are in the2up o ;uz/zg m0ng+sh2 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 dvn/5qmu kl e7f)ek7p9fb 8a: a 110-V primary if the 24-V secondary has evqm97u d fkep)8 a 7k:/5fnbl100 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 500emnx; 2ehf b2ahe5x5*4 2 xgwulz)o*83rfn ow -turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primaz* ernmgxx eof)el n4w22h2wbx o;a3fhu8*55ry?

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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 transfom 2pm2apjv)/t rmer. Assuming 100% efficiency, how many amps aaj)ppv22 t/mm t 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 tran nl*um ;6++g-zfpianqsformer provides 7500 V at 10.0 mA. The primary coil operates on 120 Vnn g-zpl;+uf *mi6 aq+. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seco)ve4n vdm6 k +j 6mzdy1-,5gyse8u rfwndary coil. If 120 V at 2.0 A is applied to the primary, what d gvf r5+1)nv86- wze,js ymmy6k4deu 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 3i hhi5c6 ci6np4y41r0art *)ddb fnhand 300 turns on its secondary coil. If 120 V at 2.0 A is ad pn46)5 4t06i*ria hncyri13fdbhc hpplied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hast-h p(n*+zf .rto9 7f qqu:kue 200 turns. If the input current at the primary is 100 A, we can expect the outpu tfqzuruhq+t 7 *ofek9-:. np(t 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 hf7y7r0:f xipqas 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of 7prqi:0 ff7yxthe 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 secondarylc lf1jh5fju +z*i0r8 has 200 turns. If the power input to the primary is 100 W, we can expect tjffjih0zl*1l5+8r u che 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 1208d8h7glnu *e1gb . if5auy :fo V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resisg.*:y817udu8 fhen i5ab g loftance 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 usuallysymw1-i (ot ) cljvh ;o15sml3ofz+.u stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage p1vm3 woi.(ljtusm5hlf; yz +c 1)s- ooower 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 usu pj65wdj5;0arbt;(: k i a -ymjrd.ivcally 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 voltaged ; 6p(-ad:;y jbra.t5icjmj0irv5w k 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 resisro/ , n/qlvwj0tance of 0.60 W. A generator produces 100 V at 70 A. In order to/ovqj, nlrw/ 0 reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long ha oeq/o6ki65g9mfg .)sc3vyhx )0i ua.lfdg 8fs a total resistance of 0.60 W. A generator produces 100 V at 70 A. In ooo i.9dhl 6sgx/ug m35g .e8q0)kyi ff fcav6)rder to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would b/ke)rb/ u9; u, vwn9.nqhvfyd e lost if the power were transmitted at 3000 V instead n9r ,h.few9;vk/qnub vu )d/yof at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be trans7im q8 g-6toqwu7ku, emitted on a line with resistance of 0.60 W. To what voltage must the generat t7m,uoi68uqk- eqgw 7or 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 .bl( wlzhdo2xwm3 gaa7;ks :/ 5.0 A. How much energy is stored in the coil's magnetic fielwla3 o.dbmwa/x(lk z7;2sg: hd?

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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 resimbvj5uo n5*n. stor and an 18-H inductor. What is thiv*.un5jbmon 5s 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 circuit where the rms voltag jqgs2 6x,pugam 0cu0r/gt.c5e 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 thl my 1.u7he5zcftv)7w: (unskhm8)ul e 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 the resistance of thez1yle*g 6i 9d5 0mjnfs lamp5j60i*mngzd1 ly9 efs?

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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 bg 2mku.(acf6 power supply. What is the peak curren uafmkc .6g(2bt through 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 isx,ynh) ajjo3udl;/;9ug y xn7 the power dissipated in the xd/ ),hxu9ag;ln3n7jyu;yjoresistor?

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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--k ;( pyxd ) oi;upfuwh*i8)mrW 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 resis x hn):u* e(tdzs :qzbh(wyl+qe9g./ctor 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 reo rf tub7/ bwr3fjp7a8m,zp 47sistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH indu fvcczge6h7s+ b a+ *q8tm9yr/ctor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hip+l 4yhd35d*)mef7e i-tvx9xjb9 f jz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wilr 0;-k88je ;5 chhdzx-b4uujeg4wg jyl a 14.0-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 necesl mw *c hk28ec.+j u3if-pqdr.o3ug2bsary for 157 W of inductive 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 whq(4 x5ldzz*w(h1 g+kyl ;yos0e fink :en 120 V AC at a frequency of 20 kHz is applio d1+zkli(gqx:w l ;fe*s0z h4 y5(nyked 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 2.50ip,w.wh6 af p*twf 8kz0;m;z5iv ;stt-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 a 4.7-mF capacitor at 10f3r9+o rw :rm.dp dkb)d.mk, lm:mw o1 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 kHzjkzv*04ty - t+ac gc zlc-(6nk?

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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 1 ;xmc(licp4l 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-mF capacito 1xs wu. pc6ff2kf-y.mr be 100 Ws yx-2f6 1.wucpkffm.?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitw1v;jtown 2re:t +tc *tw22 rzh:jco-or 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 withb rdtx9-(/6+azsdg b o 12.0 W resistance, 15.0 W inductive redbgr/(bd +9-sto x6za actance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if k05p7*h+hilr lr(.p moku1jma 100-W resistor, 20-mH coil, and 1.0-mF capacitu .ok1l0rp lh(7 km5h+p*rjimor 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, 20hz6 z, , duq2fe,wi2dzclul( --mH coil, and 1.0-mF capacihiu z 2 c62fu w-zzl,lqded,,(tor 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 c nangj8 5+g n/wv7v 7z4;at.xu9liprponnected in series with a 20-mH inductor, what is the impedance atvn/8n g9v p4 tpln7w.75ja;air x gzu+ 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wha53rb9qwf7 ea m0/zzlzt is the pha3lmrw95f/ 0b ezqzz7 ase angle 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 1f,zb,xu wb 8j2.0-mF capacitor for a total imbb2x8 z,, fjwupedance 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 with a 100-W resistor a+dvjkkh( enf ,1 031inmdoy7xnd 15-mH7d m +ixyh0 okedf,31n(njvk1 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 withfljdx4wuu+qj,ye gn 54 j-,aden(v;. a 450-mH inductor at 5000 Hz for a totq+edu4u.n-g;ve a 4ywfxdjl,jn (j,5 al 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 (n9ew5 rbg)emecud( /;ymdg q8d7n8q resistor at 1.0-MHz for a total impedance of 150 ddem8m( er(y5 d7/qb w8;nuce9 qgg )nkW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the impz/rmgl(0;b8 wg kw4j:5ln gloedance g4m(gw:5 g;b lrl8wk0jzl/ no at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cr z3s66l*fnlcapacitor at 1.0 kHz for a total s n3lfzlc*6r6impedance 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 at 1.0 kHz for a ptu-zzkns0(7v qg3 gdm4ikbnj, 3k .*dhase nvzt-7.nqkjzg*bk3du dm(si3 g 0,4kangle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor g09 +pioeby/f at 1.0 kHz for a total impedan+ of 9e/i0bpygce 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 capacitor atzaui 4-9dcb+ j 120 Hz. What is the phase angleu cb4-+j iad9z?

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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-Wxxzhwl(ssuy,uj1 ( 3 8/ssf;in9 koc2 resistor, 20-mH coil, and 1.0-mF capacitor are connected in s(kcsxo8 xl(s/9 s,h j2 wuys3nzi;uf1eries?

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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, and a 0.a j8b/xf7(v ka zydg-d;a8q/g350-H inductor. The circuit is connected to a 120-V, 60-Hz8 j 8(/a ab/7xgdzg- vdaqykf; 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 reacta( r9dx ruo-mb:nce 30 W, and an inductor of inductive reactance 30 W are connected in sr o:-(xu b9mrderies 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 cir*efia:i j b tq; au);2,lzuo;hcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6ja);e 2thfq ioab:l;iuu,z; *0-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 blt0;;a rjr/t s,tb.aa 500-W resistor for a phase angle oj 0r/tt;ratbbals ;.,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. n./- xuy i-,ks/hjhru At what frequency should the circuit be driven in order tru kijhs/x,.-nyu/- h o 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 wityuvl 6eo-yhop5 rsuy w9;/ )b4h 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactan)y 469p/ebhyluw;r-o y5vou sce, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC ci(i6f 80fl5-jvgq nogn z;+ q4kh,njtsrcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistanc7 n it;mcpcm1r+eb 05tmg5a-he of 30 W. What is thet ba0+;cp1mht e n-55ic7rmmg 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 fac:b*1vwhxsie6 gao(p : tor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and ax::ahsw6pv1ie bg (o* 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 k.qnu-. h9,aqd jho y7a 1.0-mF capacitor and a 15-mH coil in series?,.y9k7dhoa. njq hu -q

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needy9 pw 2l5mts) +chig;l+s *hlged in series with a 4.7-mF capacitor for a resonant frequen;t gc l59 lyp)2sg* h+mlish+wcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor fe;p(7m xen z(wfz 1ra,or a resonant frequency of 10 pe 7rwf ((ez1m,zna;x00 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 withwez36 fiybtu.yha/ 56 a 30-W resistor and a 40-mH coil if the resonant frequency 3 t6h6b/faziey y u.5wof the circuit is to be 1000 Hz?

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