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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 exc q*4yj3inw uk.ept

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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 thf:ac .o 5fs5xwhmrm enn1ct)5 m72h*ze $emf$ 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 whagl)x/: zup -spt kind of change on the inducz /:gl) p-spxued $emf$, 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 produce0 f0,6:jbdcssixa;lc s what kind of change d;, s0s:fac 6b0i xlcjon 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 ea0or t) qkwzpm0 6+gqodk8(: k*ad1fwire produces what kind of change on the indua+r1(6* kqd em)za do0 k0gpqfto: kw8ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field*6hoef9rgy+s a4/xljnf5 sq 1 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 j/- gdf aop; ,a4:kkjidirection of an induced current in a conductor will be that which tends topoj/fa,-k;4 d a kjig: produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is z; vzs/vk*u( b0cz* (c*og ynkheld above its center with its nor*o*k *(;0 (y/zn b zzvcukvgcsth pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A 6q05uo /swd mgi xkx-34lc7 yzbar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed fro7k5 364sqicwxlyz xmu/ o0-gdm 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 fic +**jy e+vf*3wvx( cn0fup :gi wfel/yqy+d1eld vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sens * 0**dg3vqf1++(lyeyc: /uvf fy wjxinwp+ece of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fiee4*c1 u(1x4gp gfk xreld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directikc*geex u(11 fx4r p4gon 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 fie(xx qah9 q7n7)bfi 1vrld points straight down. The magnetic field disappears suddenly. Whe bx7)(rh a1v9q qixf7nn 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 tablj aejzj7d1 oe9p.q0v5 e and carries an ever-increasing current northward. Two c7z 9. dj 0qej1ev5opajoils of wire lie flat on the table, one on either side 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 through a loop of wire with the north pole enteridur51n 4b v:hc/(iq vqng first. As the north pole enters the wire, the induced current will beqir1h b (nqc4vd:u /5v (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 constab/u+6p 7mogd )rfegkd bg)w ,1nt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's grude1wp+)o6,b )bm7gf/ kgd 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 ro 9 6qlm9gbojf 8+ra cv5rvyh6;tated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of tj;vb6 ycfr8go6hq95al m+v r9he 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.;o :noj0jep/ o
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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 thpcq)gjp;eoeq8i6 8 0 lat 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 magnetic field.pq:gpjkoq 3-v.3id9 w 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 b7 p u+p5q0 ni ul)f3qc+wh)foin the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the+7c3)uw )5h onb l+q ffiupq0p 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 constaivz1 0q0 qd;fant 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 tran ai,p+lv kje h+:l88pnsforms

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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 second. The frequency 7uxb1 ;h2syl o)okou yu-,3 dcof thyob 7uco ,ys)3u ho12u-ldx; ke $emf$ 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 devijx-hc/x ; f jb,k mvp:4n/ya:fce used 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 devi;y(ih 0 :(hbro 8s wuuogdt)v(ce 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 txdmj0 4 jtvj4)cjj mq7slv:80he secondary coil contains more loops than the primary coiljjv m8sxqjlmv04)t07j :jd c4 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 the primary coil contains more loops than the secondary coi* auepu8,vnq. 07itzxbz/ nj*l thtu7qx*vzj08/izb* au enp, n.en it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inps y:1,xo;miks+) yan tut

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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 resonantp; g2c 4frfe rldp7um*2z q*m/ 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 indub ,*v.wx(fu) xhiq4stctor are connected in series to an ideal battery of constant terminal volta )s4ub.t,fvq *(hixw xge. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an in3e 3+ fax furzue+a 3+2a8cxhiductor are connected in series to an ideal battery of constant +afu3rxz8i haa3e+c +3u 2efx terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connqpcn;* 0 q:d4nnsrm:eu1a /qyected 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 vcgc94t/ law(2tbu j,R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a by6dhgs h06mr .attery. The time constant for the circuit repreg6h.0hdr6yms sents 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.vpw* e awc*t22.*p a znbzk/humf h2(0weoi 4 connected in series to a battery. The battery is suddenly 2 za.two*p*b 2v4 fmz2cau .*e(iwhehnp wk/0removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same r1 7nkw;rns dk,t7 8dcvrmx91 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 supplhxw*y:i/p ,vb bb vr9b16:yqby. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supplpe0b 3dl0jc5.ow s;qry. In this circuit, the currenterw j bdqco;p030. l5s

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance ia vix2x:g*x plu:-o5s ;bx,lo-uf2lon an ac circuit changes by what factor when the frequency is tripll2lvfb:x: uo ag2 - oi* ;xsxlox,-pu5ed?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled,8okjk,r)-t7 yepn z*4g7ub u8fm:q io the inductive reactance of that indr* 8,k4iy8 okubeg-ptq7u:7o n f)jmzuctor

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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 Ajhtuie.b7,; wwt (a j;C voltage across an inductor approaches zero, the inductive reactance ot.wwjh; uba j(; ,i7tef 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 coqom7m 4wjra /.*(pphc nnected to an AC power supply. In this circuit, the curre*qar pcj4mhp mw/(7.o 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 when t;t /jbxtvh shkun0 q9 yr,+w.:he frequency w,kn.t y:u/t ;jh 9rh x+q0sbvis 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 h *mlwguzs jz/k: p*8+voltage across a capacitor approaches zero, the capacitive reactance of that capacitorsm zjkwl u+*/ph8 *:zg

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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/x2g*a -zjtpw between the voltages of the inductor and capacitor in a RLC se2z*j/awp -xt gries 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 circuit is defined aq44 e too-x9gos $\cos M = R/Z$, 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 circuitu-7bdnra q4n8+ xib) l. The impedance of the circuit increases if R increases. xbr 4-7nn+a qilbud8) When is 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 circui5vus y9/i2*cgr rp lh0t. The 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 circuit. The impedance j*p6gt3zk i,y of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance botha*7 u8vd 4x5l, wa cxyqspyy, ;7e2nvx double in an LRC series circuit, the resonxvl7 u8a5edyy2qxpv w;sn c,a4y * 7,xant 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 that is driven by an AC applied voltage. At resonan2t +*s( htw(whf;eeyy ce,

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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 otqg xz2w+c c 6(9ankxl s6jra2., x1vuccurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0. d3j2no2zc 6oe dg;8vt20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are par ojevtz8nd 2cd23o6 ;gallel.

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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 szx*m a)3ee j.m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic sm)a *3xe. ezjflux 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 rotati1x6 rv1uhat x(ng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the p11(av r6xxuth lane 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 singbqm9 x7zk: 31dxaodj1 qvr 95yle 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 chagos .pr5 s2ccj8r x*)ynges 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 cmb,3wx q/ai-m m;. .woy1txwrq. A uniform magnetic field is applied permw. ia,q3w; ox.1btq y/-mwxrpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and ann q u-vllp7+ wri8de,) 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 i,(k3fdl vfi/8xk,l parea $0.20 \; m^{2}$ 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 p(1old5yb6du horizontally at a location where the downward component of the Earth's magnetic fiel 1you5 d6(dplbd is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angulmyj c3aubii nm+ y(4zns*.8u3ar velocity of 2.0 rad/s about a vertical axis through one of its ends while in a conu mcab4i33y.z+un si8y* nm(j stant 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 ox9 has t/k*v;umjyx/ t0mi,d9 f $0.25 \; m^{2}$. 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 turnsxea ngn5d k:a* (.,did 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 ihqc6/ib;f7qu agr/) loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generato hgufic7r/;a b 6)qqi/r?

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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 aqm)/ 9gje6a x:rq/l hrrea $0.090 \; m^{2}$ 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 qzrdjf+.yja 4w/ lv5j1zv4z*construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A maga4z*jyv w45 v1lj.+d rzqjz/f netic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a genbbdu1xxj8, ; )+r q3nbhtvooi8h hjda) +zo;5erator 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 6.00 W. The motor operates ont5q f4gn9 +d+x2glqav $120 \; V$ 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 e0 rdi*+j j4mtwg/vf+motor operates on 1/dj f4+eigw+ 0vrmj *t20 V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal rexozf: z)zs6 c.eb m wu,vn09t fh5mi,/sistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-n:w0,6zism /f .vhf 5butzcoz,mx 9 )eup 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 internall2 duwmmjknqh9 h b,5z7/z*3; +bejvx resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.hde +bzz7lw ;mhx 5/q2,kvm9*nj j3 ub0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected 1f,4 vhgpnv(0h +go0nc6z rg vto a 24-V power supply. The operating curre z,nc4hv(g0fph6v vgg on 10r+nt is 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 needenad.escb8li2x by,jw a 6r57/te9c) d d 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 trans2, qobcbv uge64tvmzoef 77deef6;,8former causes 14 A to flow in the secondary. How mao7obv28; geeme t7 c6v4,f u qde,bz6fny 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 phc2belzv-e b)hn,p+ z: *( zh9g-zola 110-V primary if the 24-V second oz*-hp:9hb) h(plz-z+nbzvc g2le,e ary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and 0kp/dyy(c 8j*6iut d5x 9tdsm)xav* n a 2000-turn secondary coil. If the currkd u*vp jm (dtx8ya s*5c0/dyt96nix) ent in the secondary is 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 primary of a transformcn y6 h(rujgp; h5-tt-er. Assuming 100% efficiency, how many amps at 24 V can flow6p-t( h-hc5njr gu ty; in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0+(r*pldoi shv9 md2ir mx5bsi904f p4 mA. The primary coo0 rd 52m4ivfi plsbd+ ih 9(rm49px*sil 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 on its vp ghv/2w0l l8f**k blsecondary coil. If 120 V at 2.0 A is applie v*p l */2hwf8l0kbgvld to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 v /sycp:n/3( m2vix olturns on its secondary coil. If 122i3ny svvmc:pxlo/ / (0 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turn .xvw7xihplo7a)c(me3 rf,a1 s. If the input current at ex ,o31m h7c af)wivrpalx .7(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 transfo*lpks5-ooajq ap7,trvs1(c *rmer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outp,pq cvt -7**aalsso( 5ork1jp ut 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 3x,nbru h wx:.its secondary has 200 turns. If the power input to the primary is 100 W, we ca wbh,3 x.ux:rnn 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 volta0/gkh*jqx 4+xdhu d v1ge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the pri/ d4vhkx+dg q10j x*uhmary 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 stecmzc w *5mgf4 1.f4ysopped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Finf*z.cs 4w5mg4ym of c1d the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually st snnpt(b6tj:guv5 ; 38gzgs/fepped up to 4500 V by a transformer and transmitted t;gztbunj 83g s65(p/nvf:ts ghrough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has acdu1;4prb 6y p total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to redupd;rb 1p4 cu6yce 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 has a total resistance of e07au 3 sqr:gp jsm;(l0.60 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. What percentage of the original energy is l3p0slu raqsj: 7(m eg;ost 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 wodvrou/0ea.--w4rhd - gmng4j uld be lost if the power were transmitted at 3000 V instead j 0dggon-- r4w-hadruve.m /4of 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 trc5a ,a8hsu z:pansmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to ,aha5 cpzu:s8 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 cu ud olq 7u7)0x2)irjes92v2kfd*vk yxrrent of 5.0 A. How much energy is stored in the coil's magnetic) j xfsuv* i7xy2olq709d2 vu2dkk )er 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 contains a 6.0-W resistor and an 18-H inductor. What is to4t k,x.ib 3bwhis circuit's time c4kwox3ibt , .bonstant?

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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 voltp,sje o9o e. dzc)h4.aage 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 isw udks:8mfqz70 o ),ij 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 w ;- 7h1f: q)igiv(tdpdp)sr g120-V AC outlet. What is the resistance of the la 1pq g)d(:p7stw;rgvi-)dhifmp?

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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 supplnm-e 1np3h3q o8x9 wdsy. What is the peak current through thh 1qno-8dpw3 3exmns9e 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 1mmp hl42fn*x220-V ac power supply. What is the power dissipated *42mlh2x nmpf in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5dka xlk);zfm-ym5; l 00-W 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 res1tp+pbv 3 ,1:fdtf (r bsqlvyerrrwmt+6,0o8istor 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 resistorfj8;g w,b( vvx 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 in+v8miq d(jd n i7.hvz1ductor 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 reactancbev wu) 06hkm6e of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactance0f)k kwm nahie:bd8f -(*h4sm?

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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 1000a5ics2kh0wzo od*j5frie6ww1(v 1 6z Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC aturv;34/sg2ew z ,gml p a frequency of 20 kHz is appliedw4r/2,pz m; esgv3g lu 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 2xvwar.h f76+x .50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4e6y(gfczd w.o p99tjrs w4)8q.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 reactanve /4akmon2yf(c0 n: (fr(8o h/rveqgce at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a ref; vm )fd:i:djf; szl)actance 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 capaj1w92s 3) ajvvu z.ippcitor be 100 W?z1v vasj9i2u w.) jp3p

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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 capaci 4ggskh9ena((aw yo; -kmil(4 tor 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 circuitlm -b, zi*.k 5s+4bdx rzexqsf5wm : k)*nkr5t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capn*55xz b4 t+im ,lw.*5k-k)r x ers d:ksmfzqbacitive 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 atdy81p3s v h vjmi1:lh: 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected:i1 lpdshyv8mhj:3 v1 in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-q0yi:+ de wa6 wrs9ggou8 6w2nmF capacitor are conn:gyi26 qrd guow+n98was6w0eected 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 cq. ssk 68pgie76(rwnis connected in series with a 20-mH inductor, what is the impedance at 1000 Hz? 6gsr. sc(7kwe6i n8pq

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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 se bkd9,6xhr6dn ries with a 20-mH inductor, what is the phase angle at hd nb,9x 6k6rd1000 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 ser9y. m fhlz+t,nies circuit with a 20-mH coil and 1.0-mF capacitor for a total imm th, f.l+9nyzpedance 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 wpu wmj 46qt(y6ith a 100-W resistor and 15-mH coil to get a total iup(6q4m 6jtyw mpedance 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 a-r /5w)a4o thhz4o tyrq(vs4it 5000 Hz for a total impedance of 400tiy )/ hwqt-4zr 5 orsoah44v(00 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 ine418wmr, drq(2nbaev series with a 100-kW resistor at 1.0-MHz for a totab,d (8 wv2mnae14rre ql impedance 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 connected in series with a 20-mF qo*g :rtm,iy;, )k7vm-c ih4 vpb4 u(-tjpeckcapacitor. What is the impedance at 10,vuvpok : mpjb 4c-cei*y-qm7 tg;(rkhi, )4t00 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 kHz:0h st/utl higb:cw ;+ for a total:gwut:h cih0s+ /tb ;l impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a z buo r:htip5 4gh8mn5yz :z)8phase angle 8gty uiz4r:bhhn8)zz: 5m5 po 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-W9r9r 1rj/ffmx resistor at 1.0 kHz for a total impedance of 9 mrj rxf1r/9f45 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 at 120 Hz. What is the pug1n1zh.z4 :y2pkp p rhase auz1y kp1.r4z p2g: nhpngle?

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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 coile;c xe w* pcvzrbr+.1-, and 1.0-mF capac rrb+- *;pzxc vc.eew1itor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10eyobj35 )h ay0.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the aj y3e)5hob 0yrms 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 capaci;9yqh gh x;-5wpt.c kltive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this c9.gyq hw;;pch lx-k t5ircuit?

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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 con0s rnf: adt/(zd bpn:2f2alg m +db(g+taining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when co2 nnrtd:f0b/gl(p2azgs dd: +ba (f+mnnected 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 sel sk(fdhcnb 031+uf6eries with a 500-W resistor for a phase angle ofd ff+lun1( she0kc63 b $40^{\circ}$ 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. Ae*qi kk;12:rk9hmv j lt what frequency should the circuit be driven in or jk 9;*hqe12rlv ki:mkder 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 outp19k m.d*svy xfh shvrt ,n115gut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, thyvx1v1rm .,fg 1 s5hs d9kn*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 AC4b;ldj4( -7cxfu8vft lz nis; 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 impedance of 60 W and a resistance of 30 W. ic ew98whqz /dbcx)77What is the iqe8hb7dz x)9/cwwc7 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 cigok l-+,e1tv cfc71w*xj qqu 9rcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducte- 9k7wt*, 1jvclu+1qqx gc ofor, 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 1.0-mF capacitor and a 15-mH coil)m+ 9dku y5i*z0 3la2o(u9pyd qsvafj in series?a9z 2p9+dakdu5s*j(vy ouyf3mlqi )0

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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 .f/ dp:16x9gwjbunu t capacitor for a resonant frequency of 1ng 9u6tp1bf wu/: xd.j0 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 nee :y )jj(seg+pi9u lzq z3tio27ded in series with a 3.7-mH inductor for a resonant frequency of 1000 Hzz2jt i:l9qyz s) g3ieu+p(j 7o?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH fqey1ygiedi7r)+.gmgu5( 8og w; 0 eh coil if the resonant frequency of the circuit is to byr)wiqdh 7y; +1g.g e0gu5 eie m(gof8e 1000 Hz?

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