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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 0lhga671j;or 3hnrh z 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 inducti4dvcfp7j47* - tw pfqdk z9;roon states that the emf induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change 0nhp0ztb4 s.don the inpszn.04 hdb 0tduced 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 ..p kw/ tb/uhha loop of wire produces what u ./ hh.kbpw/tkind of change on the induced emf, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on thlty*q8b9g/u dc)cm n)t*yc2it f :d,ne inducedfcy) dmci/tb *cd n:t)2nyg*,tuq9l 8 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 fu62 nd 5oey :0rnbg0ozj9u pzptfpm9+)/mr b 0rom 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, then;usx su0og61y1 d c p4k8; nshr;jk(z direction of an induced current in a conductor will be that which 4y8uu;ns0kdn611; j kcsrgx ozp; hs( tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal ta9;m kh *zf:s d+/uuexsble. A bar magnet is held above itsm +/u;k hsdxu :s9f*ez center with its north 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 bar magnet is held above dgp :puur.d ,:i-rl/m its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when v.r ig: pul/d:r-dump ,iewed 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*vxs zdhcx.)(w4w6l u table top in a region where the magnetic field vector points vzs.wcdx (lx46w*)h u straight up. The magnetic 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 in a region where the magnetic fiel 6xob; 5.nyy pb- -bp:zeh;sn+y*kxyzd vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as ;oz-psx e y .5zn*;b6yn+yyx :bkbph- 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 tsp /+bg0w l3wgable top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, bwwsl03/g +pg 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 ca11i ,mtkrcr(cmkvye r38( li9rries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either s(v1rr l3ckmycri 1e,k(m8it9ide 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 pof j jrljzu2v4xkb)/hk8;g 7c8le entering first. As the north pole enters the wire,xcghj 2jkr) b;8j8 vkz l4u/f7 the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constantn-ddmq;8 g7x ogvvq15 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 axis g7dvq; n1odg- mxv8q5of 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 cfl2qzmus ;2ey6 kith oa7dj 7/ p5mexp7d59 3honstant angular speed about an axis whose direction can be varied. In a region where a u u9ad i2p hmf 7m53ye;xhpt7d/7kzl62jqo 5esniform 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.p8of fmb pfj:p wk(4,) bvlcu(o.( y,v
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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 an 3 w:vem(81mtlz z b3xyemf 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 fielif/k3kdy s.8rib 3ti+ d. 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 directi3anll5m y 8mv/0d 5ad:nuox-pon) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concer-5olu d a3n0vylxam/ 5pdnm8:ning 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 a constant angular nn ah)c1 7x6kg 5dlr) s od(x*as-ia:svelocity ω 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 generatogkds.y) c2wb- 8u 3*gn1rmdsvr transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. Thqc/vtn-nyr t8-ujp 1, e frequency of t,yctn/n -- 8uj vqp1trhe 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 us3jgg.0a7r y *6 nnlghded 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 def6t2po9k qdy*t5a99f /skwa 1o apefi4e -+ jmvice 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 t.wz 7dc z-/uz11l vq:+4qniin; lgur0zorsp/he secondary coil contains more loops than the primary coil then it igqr zisp i c zz011-w d+l:/unqlo.7; ur/n4zvs 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 movwx(cte+v sjw 7a)h4s w1 8c3ure loops than the secondary coil then ix4 7uc+ )3 ewwhj(8t svac1wsvt 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 heqii x0 g g,nd(9v);ppower 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 circuit,v mx7o bfa)7b6 /8gxut

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batthkv42:c x2 uaxery of constant teruxxh4:v ak22cminal voltage. 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 serie9js7 4 8vlp 0zjspjvk-s to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the l78s-j4v 0 pp 9kzsvjjvoltage 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 w(c h 0lbj;nggz--/wrv3k2dbba*(cd and resistance R is connected to an emf. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 andk joosdw dw .8-eb.t 3cu)hi 1x mr-k(b.,a.se resistance R is connected to an emf. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same emf, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time const n+qh q:yo(n5iu:v pz(p:qh:5(n zq+youiv n (ant for 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 to a batgxk. ugi v2 r:8-odcy,tery. The battery is suddenly removed from the circuit.dkr2v:ucogx,.-i yg8 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 samem3ibw zk h+ 9d b(xv56/yiqxywc8 /d1w units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curaywhy0 ;mw e,8w89tt orent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, tz1ttthf2h56g(p7 j d whe currenttwz75 2j( 6fhgtd1h pt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the fe::dk ;uuz-hk h;(b( 8rqenljrequency is trr:(hh-jlb(;e; k :qku 8 dnzueipled?

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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 acjiwj5 1 snf))fross an inductor is doubled, the inductive reactance of fw5j1)sf )nijthat 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 9ilbn2-l2k2el4x cc e inductor approaches zero, the inductive reactance of th9 el2lcbkic24- xen2lat 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 xk 3 0k5rvoqt/AC power supply. In this circuit, the currexqktv35 kr0o /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 3z0c qsnxot;5 b*7kmx5e*wag 7d7hwo changes by what factor when the frequency is tripled gm ;b7 wkedxq5n03sx toz7 hwa5*co*7?

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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 t ,k6)vfz+uir4l 3ebper 78dzd he AC voltage across a capacitor approaches zero, the capacitive reactance of thatp ld7z4d f,)ervk8+b 6 3iuzre 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 betw24dw+*th dlklhu,ke (g*off - een the voltages of the inductor and capacitor in a RLC series circul**hd +f4fk lok-( dthguwe ,2it?

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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 56y un9vx3ybrwboeo76)ygc ; 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 impedancewsep 7k5;4eg c of the circuit increases if R increases. When is;k7s4e5pcge w this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the ci1e,l t2iw z7earcuit increases if XL 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 cictaa9sk: +0 og2z-(ne,t gpm nrcuit. The impedance of the circuit increases if XC 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 t .xsw 5*iy(xdkhe capacitance both double in an LRC series circuit, the resonant frequency of tyx.w ix(5d*skhat 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 :2rt4kd rrr1yresonance,

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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 wqd447wj(d cyac 0,vq zhen

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of 4.0×10−5Wb 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 0.206pfohg-*c ij4k 7l( msa*j o5dcc1cp((oi3qh T. Find the magnetic f6( js-d((jaof3i oh75i cc1cqkc h*gmo pl p4*lux through 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 abljfl/zq-:ie7f-0a d q1gg-.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when0ba1- ez gf-:glidqa7 j/qf-l 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 rotating i47xpr j0qfey +byi 4adtx8jli:q2:.ln 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 are at an xy 08rjd qyl4j7qti: f+.xebi4l:p2a angle of 30∘.

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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 adjust5bll-j-, 5l vb7oa whsable single loop is reduced from 1.0m2 to 0.50m2 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 chve( km:z/f ie;anges from 4.0×10−5Wb to 5.0×10−5Wb 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 turnszce u c6a,) pe)n7yjps+(v fl5 of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. zpj )c5 +en)afl7 6 pu(,yvsec 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 ozxo3o1p5((*swzau ,i pg7c lan area of 0.40m2 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 andqi;t7-ex+uysah) :oq u.jn6i area 0.20m2 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 horizontale/3 rfrmz)z k( d/65dfmzw9nmly at a location where the downward component of the Earth's magnetic field/rnk9m (ez r/5dmz ffzw d)m36 is 6.0×10−5T. 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 a)8pjfh t;pef ;ngular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fie ;j);pfhtpf8eld of 5.0×10−5T. 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 qnqxww*i81ym 1xlu tzw,,4aiy9vt 74 a cross-sectional area of 0.25m2. 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 5 uyy 4dm.++w+a* ax 7pgknulrwire of area 0.090m2 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 loo(f i9mjgeignk p)n: 7k0*ty3 kp 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 onp:*kejgy7i mg93(f kk it0n) f 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wi)wboa5e6-c f **g wzhwre of area 0.090m2 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 A ai(hasjpyo;df jw mi+6884t 7C generator with an output of 12 V maximum whepw h8a7jf68s otjm(i 4a+;idy n rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is 100cm2, 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 m/.g6kzoc 9 zuxaximum emf of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of 0.030m2, 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 of4wkaur.kxv4 k:y.n) b mrg 0p; 6.00 W. The motor operates on 120V 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 res) e,hk5we uic-;5nbnvs2g(oj istance of 6.00 W. The motor operates on 120 V AC, and when running at full speed s2c-;knhu v5o b w),e5eg(jniit generates a back emf of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Td-ag:n4 (wuyayjl( .h he operating currajn dy.(y h:aul(-g 4went is 1.0 A. What is 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 t9whxw ap7; / 4/rdxxrbjnj;7 i;/ rnj6.0 W is connected to a 24-V power supply. The operatin/ha jrx/ nx;x tjr 7b;4p;dnji/ww9r7g 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 is connected to a 24-V power s,111ybq 1gkoqxf5og (xjm zs.8opx2gupply. The operating curre j1boqs g8xo1 (ozx51.yq2,g 1kgmfxpnt 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 x2i 4p n/m;iag(t.doiis needed to reduce a primary voltage of 120V AC to 6.0V 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 trazn * y* zdoli-wa-3mt;nsformer causes 14 A to flow in the secondary. Howiy- n;3 -m*aotwl *dzz 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 815d ro(s5 ezk3z mzlka 110-V primary if the 24-V secondars kmzdk5(zl1e 3z85 ory 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 a 2000-turn sechybk1 j d1g7b3ondary coil. If the current in the secondary is 3.0 A, what is the current in the prkjyhb731b gd1 imary?

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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 uy,angj4u (4 2 p4uwrlin the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V cuw(y,u4r4 lg4 2ua njpan 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 transformh m wtt:o r)tenla6360er provides 7500 V at 10.0 mA. The priman6:rt o 3tlwa0h6e)t mry coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer hasbai2j (a (e3gm 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is apple2 ai((mgab j3ied 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 oaayl28ba dek 1fb 5e41n its primary coil and 300 turns on its secondary coil. Ifdl ea2y1baa58bekf 14 120 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 8c,kgan /o6(v y7ltfwturns. If the input current at the primary is 100 A, we can exl7,8(f tk6 ngvya/wocpect 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 , ys2t yqk/ghuz(2,hh 100 turns and its secondary has 200 turns. If the input voltage to u2qhh,yhy(k,t g/s z2the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tuve7 * 5taicylmq9(uk,3.wihtkfk 4e5kcnf78 rns. If the power input to the pit (7vctli3wkuy .9f 5k kn7aq 8 5e,fkc4*hmerimary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 6f2scnmjf1v;+y0 s8i d0 A of current at 120 V. The voltage is usually stepped um+ 8j201 nvci ;yfdsfsp 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 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 usualzm( 5a+i2zyhsly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fi y(5iamz +2hsznd 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 ofj-f6qmnn .p(havr10 j current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thro-6 m 0vqnjrh.(1a pnjfugh 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 a total resistab 2;vbg39m abfnce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer witfm932 gbbvb a;h 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 totf0 wkls;u ; q6dii,3*z95t:gd zkdfe /tsdir:al resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of thz:/r:il9d 5iffg etk wi6z0*q;tk dd 3su s,d;e 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. Hop.2n:hrku o+ 6mz sbcc)q3 gg(w much less power would be lost if the power were tr)g qhk26cocg( bpm:ru +z.ns3ansmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It iabm4+. te9.ykij0pkxs 2xz g, s to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped u9+kpyb.ke2sa4zx0 j. i, mgtx p 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 much energy is storel / llnw3n+2orl jl:+ :zg9wcra lbp+1d in the coil's magnetic +lw29lwjp ll+glonc3 + abz/r:r:1nlfield?

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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.wps kf3*le1d .g:w v2z What is this circuit's tp:2*zgl1v w3fdws. e kime 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 cir p,kx 6zjypvp ymn(: o3j 3m2)j7gtfj.cuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currw9sa/fa7 +7 ivfva .blent?

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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 f,--f*c u eid1p*m/r5r j amqbthe resistance of the lamp?/,m mbau*-jf5drp*1fcri- qe

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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 pw0r dqw0nkp.,eak current through th.wd,p0n kr0wq e resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the p*u7nq35sbg pwj/p keq;0/ xu iower dissipatedqi/3*xub0seu5 j wp7gq/;nkp 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 50-Wjpf m:o h/c0.wf: iyqd7 cvwi 0;anp/+ resistor is I=0.80sin⁡(240t). 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 resistorb +-xt4jlrkd (ep.+ugk8 ez c+ is I=0.80sin⁡(240t). 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 50-44ycd-h e0spn t f+baaq1ir 8(g3 sn6tW resistor is I=0.80sin⁡(240t). 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 inductor at 60 1:7g)ql f4nqb+mthg pHz?

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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 100*lk upsf009s5, t 2-hzleyqmf0 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 reactad(a-iys 7xv*,8 udujynce?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Habp.2+ nxlny)t v w0c5z?

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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 ind2ea wlk4y /u(iuctor when 120 V AC at a frequency of 20 kHz is applied to it?e l k(ywui/a42

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hzwl2egm z,.4ytr8 ;wli 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 10 k r0+(qi5xii mj1/( ddbm j7gmjHz?

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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 ton6+uwq49p,;b tus7qq+uz zfz have 50 W of capacitive reactance 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 reactancs07p9fxha,55ccf t q p fh(l4oe 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-mFmpcjl,u(o hp6i(r 1 1e3*0mcr )c xicy capacitor be 100 Wlcpmp ur0i)e6ccy 1roihx( 1m* ,j(c3 ?

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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 Hz f nm3jn(*0bztand 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 xo((n*v n8de*t4eg6m lb p3ogof an ac series circuit with 12.0 W resistance, 15.0 W inductive reactancep b*4lng(em vx*t8g3o6(n eod, 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 v m*ty+3)dgvs-cu w5h100-W resistor, 20-mH coil, and 1.0-mF capac3vs)-udh m+y* vtg w5citor 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, 20-mH coil,2ak60 t/8al7,h5mo ntim v ljr and 1.0-mF capac2h a86j a/tmirol07t v5 ,lkmnitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH indytj xm3g9:jd s u3v02a 38pqovuctor, what is the impedag3 vv23u9pt :a0os yjj3mdq8xnce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistorda p(ek-gk5+nhsu x1( is connected in series with a 20-mH inductor, what is the phase angle at 1000 ug5pkhe(+ knax-(d s1 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 circui , 0o)yqcek6mat with a 20-mH coil and 1.0-mF capaciy oqa6km c0,e)tor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following c d)8x2 yjqz5vy,vo /ecapacitances is needed in series with a 100-W resistor and 15-xeqyy 2c5v/z d,vjo8 )mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450/ bpay f9*hs l;ts52rx*vkh+y-mH inductor at 5000 Hz for a totalt/vsk y2hp9y*a +*5;blxf rsh 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 series6em o-iec38 dpp0ft:k with a 100-kW resistor at 1.0-MHz for a total impedance o: do 0 3tmp86ecpfi-ekf 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 capacitor. qfohl.px6 qm;ami). 2What is the impedance at qmxo..6 qm)lpi h;2af 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a t(a+ k- mywqn-aotal impedance of 45 Wwa(-n k+ mqa-y?

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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 :( bwx(vo2-hml ds +iuseries with a 10-mF capacitor at 1.0 kHz for a phase a+-sl :v d o(u2wimxbh(ngle of 40∘?

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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 at 1.0 kHz fo+epzlj :0sd. dr a total impedance of :sjdlp ze 0.+d45 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 1279evb:7 q gqpk0 Hz. What is the phase anvp:eq g q97kb7gle?

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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 V12x2 b5 txcld a-2*ms/v f-s+kcmakv f and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected a+5ccx/d *- 2af vk1sxb-tm2k2mls f vin 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 consid hk0k3 /y-km :srr1hcsts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the r-mcr0: kyhhd kks3 1/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 ca ;6 5s7 , jiacpl0+xm4sx)vuaba, v os;fpl+yzpacitor of capacitive reactance 30 W, and an inductor of inducal ,; + l)y;ps, juvb0oz+4ix7s6xaapfmsc 5vtive reactance 30 W are connected in series 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 circuit containing a 50-W resistor, as./q2 di63dggr a xu8b 10-mF capacitor, and a 0.45-H inductor, when conn gbxs6d i83d/g.uq2raected 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 withr wm8s6m- o.qx1 ;mzsq a 500-W resistor for a phase angle ooxswq m;r8zs1mmq6-. f 40∘ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequemjs 3k4jc+ :ztncy should the circuc 4z3js +tk:mjit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output i 8cg4ma7pha u 3+vfou1n an ac series circuit with 12.0 W resistance, 15.0 W inductive rf +4187maacpv o3 uugheactance, and 10.0 W capacitive 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 sw )mocrab+d,i fo* b-1f a29hAC circuit is 63∘. 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 o53 h*8arxzy6;* lewgdb( zhgif 60 W and a resistance of 30 W. What is thebh(l5zgira e6z w*hyd8 g*;x3 power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, v+innqyfg 1j4-.se1 qn) h:zya 10-mF capacitor, andjy. iheqvynn1-4n:qsf + )g z1 a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitod-vr1d 5 l juxj,8gg*ir and a 15-mH coil in series?*vd-dj 58rgg,l jui1x

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant frequq qrhz) ac8en4g1go,qn8cq **en)814 8qqe*qaoq,zcnng* gh crcy 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 serm ) tcek)8k ipj(ds- bo5ob- 4.szyd8wies with a 3.7-mH inductor for a resonant frequency of 1000 Hz.tp)5 s)8 ko - 4dkc-sm (djbieow8byz?

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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 res g *e(2tgksre5istor and a 40-mH coil if the resonant frequency of th5g2t gek( r*see circuit is to be 1000 Hz?

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