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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 followingjw:kw:gcin1ti.-g ytc:t11 w9t ksu+ are units 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 ajamob lxq2m-r+ (338c;ym r ethe $emf$ 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)(xdhmu) /nt0sev qv2 in a coil produces what kind of change on the inducemsh2ux)t/n()ev 0vqd d $emf$, 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 produv)xts c-op x 8j(r5ew8ces what kind of changejeor) vwts (8cx-8 5px 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 ofr,ma(oni qc0 , wire produces what kind of change on the induced r cq,an (i,om0$emf$, 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 from7*548zmaa4oyxf7)ekh l -g( h zwjqrh 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, t18x xmd,tb8e)ute 2xn he direction of an induced current in a conductor will be that which tends to produce which of th1b2xxdex8 n mtetu,) 8e 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 magnete 1/7a. 1-hxcnr- v+rulhdypm is held above its center with its north pole numx-dhreyap /+. hr 17l1c-vpointing 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 lpfh;6cq,n l d (v yjmd6s*; *vdk;ifki(zt*/table. A bar 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 from abov(;y ;(vis/fzl v *k;fj h*nd, *dpqm6k cli6dte)

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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 inn+o epgaq-7o6 a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in to6ne oqpg -+a7his 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 th )e()+vke cnw zlbhc36e magnetic field vector points straight up. 6n)( c+k3lzvh e)wecb The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic nu2tz f-ta5p. field points straight down. The 2.5ua-fp ttznmagnetic 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 carr n/v,.w9:rsowke mu6eies an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viem ekr:., sweuw/n69v owed 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 r1bm.ymlidh0u0ruj2,p , oo( north pole entering first. As the north pole enters the wire, the induced current will be (as viewed frobmm hoy,00(u.ruj lpd, oi1r 2m 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 ang+.9f po1rh1et--*li9cs i xx 3ntgduuular 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 axis of rotati3tud .gil-9r1 -pufoshex i +t19ncx*on 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 ang,-wnymv(za (g fe7q 8j4f8prm6eou 2pular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must 6qefef, razgpjvu(7n8 y 2w( 4opm8m-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. /f;ne v c-nk*8cd)ijj
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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 tm o2*regg /hl+nx p5y0hat 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*b 4z*hjo e:p;*jvkshgpo. f9 magnetic 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 movo2fb:sw*t7j) ) 1qx; bkh ssof1kwqd.ed northward at constant velocity through a magnetic field that points straswsd wo 1; 2*bkqbx). t qho7)ffk:sj1ight 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 as5kyxy +7q2.fizk mt+ 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 tqit1 ua*v(f2q ransforms

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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 h(zyxv.8+f/joy- lsc q)4bi orevolutions each second. The frequency of thehlbv (/+yyoxqi j. 4czf8s)o- $emf$ 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 ,u3suog;t efiz )c 7xa,,g,ic 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 devic;nh bug)z0 ve9t qz,/b9a9vll-g+cp ue 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 primaryu3/ p*u2oubri coil then it is uroi*2/u pbu3a

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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 thj 7 jx 2 4trizyn(d51wl3f*jfye primary coil contains more loops than the secondary coiy57w3jl1 xnt( rfj*z4iy2djf l then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the pow j82(qt:hbgx:ysk qvkv3vo g* lm)-b 6er 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 gbv c n-j4(4i p+ pve:(xjxjo6circuit,

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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 coe s;jn:/ jsipy+ ,vi96lxe+xjnnected in series to an ideal battery of constant terminal voltipejj , 9en6xs+;:xyivsl/j+age. 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 inductor are connected in series to an ideal battery udgpd4zvpb+-j/i mx0: )d v:fof constant terminal voltage. At the moment contact is made with the battery, the voltuiz -pvd/gbmx )+d4 0:fdv:pjage 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 resimw7t iu3otts * iu+7 .8 z*y6go*fq1 )ntgdmdgstance 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 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 isosjgy-w9b)m -,xd iq/ 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 battery. The tijof7h2uvq.u )- 7jj2jfv- kfwme constant fork-h72 f7wu j f -.fuov)qjv2jj the circuit 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 tozh4do*sjx-d x p/1xu - a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cuz- d-ouxs4*/jpxdxh1 rrent 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 units eyy 8d; sm7v7tqxcept:

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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, tkta(2 ej /us-k osro,4he 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 suppl:ev9mcgpvd0-3k qt((vb phy,y. In this circuit, the currenyk tcq(mv0pv: 9d vp(gbh ,3e-t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit cm.hx qj4ss ek3+y -4fchanges by what factor when the frequency is triplesfhq+sxcy . 43-k j4med?

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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 acayjw1xf-v d *2ross an inductor is doubled, the inductive reactance j2v *xd-aw1yfof that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero,0ocz5ieb4u j)5/d1 fj-tepzd the inductieod d-ej0u4 jt/fb55zip)z1cve reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the cur3 ysu1 g+gtwm.w v5 3mda7:pa.z+xi nwregv w73t5d:x+a1im3ay . + .wpz snugwmnt

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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 thew 4o(m)g2 bwmzp(k1 o,.yje le frequency is ge(w2ko ,( )z4wm1jp ly.eobmtripled?

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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 apfi(:f;xuw 6ecpq- d4g proaches zero, the capacitive reactance of thati gf6d uf(qcpw 4e;-:x 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 ind)a5b2qkzdibuj qp mjc f7 67)1uctor and capacitor in a RLC 5)i db71a6kpmu )j7zjbqfcq2 series 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 circui(yin37m/fq c et 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 the circuit increas- blvq-x7v*fves if R increases. vx v7*-bql-fvWhen 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 circuit. Th8(np pf: awhe9sf xl2gz(o20 lqgr/y,e 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 of the circubgjhl.z0,cub w; 5 k;lit 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 both double in an LRC se+pap:mo u:db*s q:anv57q4 rories circuit, the resonant frequency 5a:4sp+v uq nqo mpaodr::b7*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 ah2g h8 .slof3n(m 2tffpplied 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 .b *7hfg ep+vwRLC 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 unzj+p ) hsep7x1e/dx1rjlr * z2iform magnetic field of 0.20 T. Find the magnetic flux th 2171xslj e/+zxepz) hj* rrdprough the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniformz:s nnl ga :pqaofy6yon(p;15 m4bwb;qh1t.) magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector.pb6z a:(14lbh)y5n t q1m no;g: oqpws nf;ay 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 r 35p,+wvmnk7 wb aqut+by()csadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the ma+w(bukvsmyc,wqa3 p )t+b n 75gnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singls d+:,or:iy bge 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 ch6b9-rj8iu7 v )izbheoil 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 c,mg c;y-xi ze3axj w8n(o 4rti3hn3 ;rm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.c3er ( 3 ig,;t4myx i3xoawzn8jhrn-;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 a(2b;d 13zkznmkwd :.u xii ;zvn 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 l 9x kb.mwl2 h5imodd0-zal, *area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locatio ea3wx-fg2 ;izn where the downward component of the Earth's magnetic field izw3 i2xf-ge;a s $6.0 \times 10^{-5} \; T$. 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 angular gp:gjq 0uo937rm6rf r,o4 zzx velocity zru, j9 3omgp4f g0 :xrq76zorof 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a c*h *rn kx3m yv4(s6bnaross-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 of wire of area nc3w0javkg. :1 asc :i$0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loyy( b2*myh*aio);(8lj+rr v km7ovqx op 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 geneyrhy lk2mv)oyb;qxj*mi+ 7 v(( 8or*arator?

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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 arev;(7: nhx+(iifrqw: 0czsa fla*+() hxxcfxla $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generatob -eo upe/-:t,y 0jcrkk+v)str with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil:u+ej-kpy)vrk,/-ottce 0 b s 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 o/w0v.oshdb. 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 operat;jybsk+sqm 23 es on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistanc 6z4c mu0m j6nab(d )harq8ip) :ecc;te of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generatca(u m4bht06j ndczm;6pe)i a8:cq )res a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24hr.3m5:wps zz -V power supply. The operating current is 1.0 A. What isr 3m .hw:zsp5z 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 resistance 6.0 W is connected)dubfrn)4 nb. mca5 (d to a 24-V power supply. The operating current is 1.0 A at full s)u b )(dbr5fcmd4n.anpeed. 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 rdug0utup jr8lqj;78cc 9rs .g0 h t92besistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 hc9 0;s rucd28 .b9 qt8tu u7lpjrjgg0A 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 4jjw2a -ok):l: b;n)0 a0nagm bdlu ylneeded 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 prb:vqb.3t yo,qimary of a transformer causes 14 A to flow in the secondary. :t.bo qyb3,qv 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 necessary in a 110-V primary if the mb(9lc6v-uq)q n. agx24-V secondary has ( qm vcbnlqx6a-g).9u 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 5cdyh;csj7. fr p3d i)tx*t1t.00-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, x ctdf) st7prc1. .;jtid3*hywhat 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 transformer. Assuming 100% efficiency, 35pg9b1y*lxm(a czg6egzr; tsu;, gk how many amps at 24 V can f5u y 3p1c,(gbkgg gsx;z6zr9e t*aml;low 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 yhphr6of6- t78 w nn3tprovides 7500 V at 10.0 mA. The primary coil operates on 127nh3 n6hwt p6ftroy8-0 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 secon j, 5o3:mat)sx*m wofsdary coil. If 120 V at 2j o* tsm53s) x,mwof:a.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and mr133zo.,yxwv u re;f300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current iyv 3ur1fw;or z,.x3 mes 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 secondafh;+/v rk( c(kc os)clry has 200 turns. If the input current at the primary is 100 A, we canlfkh+orc/c;(ck (v ) s 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 yqkqnw*xr ru65 j9 xnob13p.2200 turns. If the input voltage to the primary is 100 V, we caq5wyq2ruob 9px.3 nr61 xjn*kn 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 transforxxi3.e/tfmp8: ncn )/s cx9 wrmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 1rc/fpc:98xemn i/ )xxn.t s3w00 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. yfpdu(x./4ggy ) k0gq 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 number of turns in th(y )yp 0 .4ugxqkf/dgge 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 3hlri6m* rka/m rc95t 60 A of current at 120 V. The voltage is usually stepped up to 4500 lr/a m 9mi3t 6rrhkc*5V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A sukrh:r 42 vs8 hogw/(hsz c,55c v-pvof current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lv cs 8kwsr5 g-vhh54 (o/vhcru ,zs:2post 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 a total resistance of 0.60 4sw 0zv+nt.u* adiov ;2 )nx gijxng3*W. A generator prx 2i.n;sd*4v)0*+uviwjztaxg g on3 noduces 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 would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A g .+, .buynn79 emo8cxadr6 vpqenerator produces 100 V at 70 A. In order to reduce energy loss dnvar8m. q7+6o nu9ey. dpc x,bue 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 3ib)hox*470kwg i u kfline at 1000 V. How much less power would be lost if the power were transmitted at 3000 V7 fk b*g4kixu3)w0ohi instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmm; gani,nv,6 kitted on a line with resistance of 0.60 W. To what voltage must th ivn6mg,;n ka,e generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How muc 5qufov1eb4 9nmd1 n9wh energy is stored in the coil's magnetic fq94b1deu1mf owv n59 nield?

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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 resistoro5 bld9j 0fe:1u 6nxmr and an 18-H inductor. What is this circuit's tidjbx e rfn l169uo5:0mme 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 :fa d pxy-ax/dr9pl+, where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120 g rgr, d16rk1vic v9g.u3q r0c/va1lt-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of thl/ 0n0c. kmnxie lampk0ncl . m/inx0?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the pea4hizy9hb:/asp65xyon. 8 z i u24lyrak current through th4nhp by.z a 2/rzhy5ly8i6 xai4su:9oe 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 supp s41gow3.v4hm7r)ex wrq3bw tly. What is the power dissiph1w 3q34w7so )rwe g.txbm4 vrated 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 50b( 46q8d pmzev-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 resistor is*qi xdwk a ) b*ovofbo-tw9g(c95, yf1 $I = 0.80 \sin (240 t)$. 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 is m g7,-(p itlbwe6*qnw$I = 0.80 \sin (240 t)$. 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 1hkt7; we *-mmps* b4fk.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50- (var4hdtd c+fi.,x7e 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 inducqg ph,*/dvin g.2lp, 7 ;ybdhttive 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 reactakitv7 w6q)8bhvke2e1 nce at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz isc6+zpu2c -hzj pq 5g6r applied to iz-2r6 gpc cq6hu5+zp jt?

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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 dut*5-qx35ywwnja ca2(en5ir s e 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 off5g/*y8q7rg pab sn.c 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 reactanchk l7,g t,iw6w8btk;az ;/ ntve 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 reactm1c4s ezluz0 2bdg7,kance 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-mF9/f1 hgxxs+8yoiwi, r.btdd- capacitor be 100 W tr8g/w.+ idx ,9s-bhfdoy ix1?

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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 capacitor at 1000 Hp)2rd*r y h7cr)1aha bz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistanlg *0 ln8 23sqrksely5ce, 15.0 W inductive reaclrs8 n5e3llq0 g2ks *ytance, 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 a 1319jsursqm q+00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seqq js 3ms19ru+ries?

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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 i6chrl* dx u.ymm3l7*bf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriexlmr y cbuld*. *376mhs?

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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 yxz-a: yf ;,eok,v z0bd5. t0vmtuuv/-mH inductor, what is the impedance atuvz /y:,mvybt , -voka5x 0 z;de.ftu0 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 i; 0 dw:,dxzpb/ku4 fgan series with a 20-mH inductor, what is the phase angle at 1000 d:40pb zwdkxg,/fu a;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 sh-(-s 6hw.yeber. jeaeries circuit with a 20-mH coil and 1.0-mF capacitor for a toe.s(ra e-h.6 h-jbewytal 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 serie)g1ll. x wy;dts with a 100-W resistor and 15-mH coil to get a total impedance of 110 W attd1y)l wx;lg . 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 serie0epqmu+3w u.uxu49x vl :*uzws with a 450-mH inductor at 5000 Hz for a total impedance of 40000lwx ux9u0 p4v+mq.:*uuuz3we 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 resistor at 1.0-MHz fo e du7kgzy t17m/6jai:r a total impedance7u yigz a t16d:j7kem/ 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 connecth 2n o 8zzeev63s2byy(ed in series with a 20-mF capacitor. What is the impedance at 1z hboe(syn e22v 68yz3000 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:s hmlh ,70cq4imett3 for a total impedance ofs:t3hm0 emql 7h ct4i, 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 ,c qk7;jwuv:q+ hih.vqa* x;y a phase anglec.akqj*y ;xv+u q7i,hhv q:w ; 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 nee4ny g3wfse tgq fdyis8u;rm )(01czo5. 8sm*xded in series with a 30-W resistor at 1.0 kHz for a total impedanct4 ;x5f80nq* fr swyc(egm.)yd1sg mo8iz 3sue 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 e:4v5h9jz 3xw0nx9c q16fqg5pxmveq with a 100-mF capacitor at 120 Hz. What is the phase angle?veqxvq 5 xn3 pz:ge4x059w 9h61qfcjm

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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, an/n 0 *sfbylpp:qxe9e.a )9l9qp yo;ogd 1.0-mF capacitor are conas o ylx9y.;p gofq)eb *pp: q/99l0ennected 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 10.0-mF q,y wn-h,2 xgfcapacitor, and a 0.350-H inductor. The circuit is conn -2 gy,fqnwx,hected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacqw .ukkz.v8 (g/a 9p pi2jf6editor of capacitive 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 flog6edj9qp.k a(wuzpk2ivf/ 8.ws 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 ser zh7+o( *ffij hce5q5zies RLC circuit containing a 50-W resistor, a 10-mF (f5qh +oe*jh z7czfi5capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resexs :(g:x6omd :cyc 4ye7 was;istor for a phase angle ofmxd w 7( aoe:6xy: y:sse;cg4c $40^{\circ}$ 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 = kxjl:eikej b-;e * m9o.6xo1j 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transfer*ee-e1bo mxjx6:; .ik kjj9l ored 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 wiv nj3g o.z+ni5r6bnj x0xe9;qth 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capjq 9jn.ro3nv ib+x6g; x0ezn5 acitive 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 AC ciao z wgoq)j2:v:oui1;az gp3+rcuit 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 impedancq2bk d0t c9t x6cq9,pce of 60 W and a resistance of 30 W. What is tp0dc9x ,qt6ct2b9k cqhe 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 ajp)2/0ofe,3zo g kb sa series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60g2eo03zp ojk,fsab )/-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-mHc pv)co5w-z 0 l i8gkrsc m2z77z/m,yg coil in series?mg)c,g5k is wz v8r0co -yz 7pzml72/c

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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-m0 (p6i:czu,rtk;kz n pF capacitor for a resonant frequency o :kczn( ;kp,rp6 izt0uf 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 neededqrv sa*;4wb 9b clz6hovi0e8( in series with a 3.7-mH inductor for a resonant frequency o8b94o 6rs0(vliwv* a;chqebzf 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in serf/l xp-ftpy65ey : d-dies with a 30-W resistor and a 40-mH coil if the resonant frequency dx5 p-y l-:d fet6f/pyof the circuit is to be 1000 Hz?

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