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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: 游客未登录  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 arl8r9o:jy cu ur4, 6ghne 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 th4d(pr;gems dn7 i 7ezrk,; qvd4ph3xlp1:y5n at 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*,a i u0vlnyqm- *l5i8gdy9bf loops of wire in a coil produces what kind of change on thyg0b58v m,d aiy*if-nu*ql 9 le induced $emf$, 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 wired v x,9y:0ptbf produces what kind of c fx,pyd90b: tvhange 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/vhrlu*-orb8 sb cz1 7 a loop of wire produces what kind of change on the induc-7l8cr *bhb uo rvs1/zed $emf$, 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 m c 2uauhoj 5:,e(qc;tl3hn *k(fxt *inagnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in;lizhx bak;c(nc km7 ):n4 rc: a conductor will be that which tends to)k4m cc; a:z 7kh;x( cbi:lnnr 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 9dc e hy;p,z7k3fs4vp bar magnet is held above its center with its north pole ypdcf7ph; k z9s3v4,epointing 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 horizol)evv f /qplvz.t* f/.ntal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, thef l.v.*ev/ pzvlf t)q/ falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where theg(s/blurkbi ,sh *o2 :l75dg*bz: s xe magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced currlsb2s bk l/i : dx*go*(ebh 5,g7zus:rent 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 leve99oo,lkxc mfr )7 d)lrl table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stron97 lcf,k drxmr9)o)olger. 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 magnlv d90a 3zx-mur0ty 7hetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the dz0h03l-v7axy mu 9r tdirection of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an tvaa 3ki3pc/5 ever-increasing current northward. Two coils /a c5v3 pt3kaiof 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 poleh 6 2(v obnt;3nljy1vo entering first. As the north pole enters the wire, the induced current will be (as viewed 631bh n2lt(njvo v;y ofrom 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:wk /d6nen s2j 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 the loop's axis of nk/:2ejs6nw drotation 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 ,u9ahc7tm5sd 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 orientat7 hmtc9au d5s,ion 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.q ki+gig;;tg8 1htx3 c
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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 dw3ff1ul i. .m$emf$ 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. Thelva7sury19 ff gt; j6603 bpxs $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward a9 jx2z:l1 5j(7cdh4vvr-gnj ( g zsrast const(4jg2:gha xsdlj v(j n 9zs -1r7cr5zvant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rot9r4m0tklvh2mbx. gz-ates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tmj(be lshug13/n wx24wjt* gvjbdo e 5/d/.r( 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 revolutions each second. T5/3l f czr jt9hy2yg*hhe frequency of the *gzhrhf/32c yyjt 59l$emf$ 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 devic/++jldme/g k rsg )trl 17c0rge 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 device tzid1 lp4 7piu/cef1: 7bshzn;hat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains mxej / knd hs-l2(e/k4rore loops than the primary coil then it is 2 l(rjxekk -/ e4hs/dna

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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 loophstb*x-d clz9d(a4o/g* 4mpps than the secondary coil then it i a9h4dd-*bxtc o*/l4z(g smpp s 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, thhj122 zcafsw d n at)lstu(6q 0hpk+(73npky3e power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant cih1 z80xund(b7 m2zrlg rcuit,

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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 battery of congh3nt;b* )yv3aqd h m)stant terminal voltage. At the moment contact is made with the battery, the b;*mhhtva) n) q3gd3y 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 of constahfnu; c6g ddt-05d5 ;dzasxk9 nt terminal voltage. At the moment con-; dt5a6 dfdhskng0cx; 5 u9zdtact 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 inducta++6a.jr kk :qh0urgdp xz0qn4nce L 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 induc -mhxjz.,/ns 11f4 v7mpqcqs ctance L 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 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 tim /+b, lv:4ioh 3flhoege constant for /i h+ebhf34go,l l:v othe 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 b+:g12 u2iuva j*bwycqy i9kn2attery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the currybi9 22aujnuwi1q2+gv:ck y *ent 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 h( fyf/)miovr buwzk(g5 k; 80yave the same 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 powev6 p11w s uk43owuvq+pr supply. 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 supply. Inx,m.u .d:k7gp l fqrh9 this circuit, the currenl7uhx: 9.qf.gkm ,pdrt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance t 8; vls4upsq71fyp8rin an ac circuit changes by what factor when the frequency is tripled? 81yfsptp v8 qs74rlu;

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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, ttx e.lir0s)(he ejzt j6x*av0g x3+3ahe inductive reactance ofvj a t3 (0rexsthzx +6egli.jx a*e3)0 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 r1citxq0y 9 c/ukw2 ,pvoltage across an inductor approaches zero, the inductive reactance of that yc,k1w9 i0/2r xqt cupcoil

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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 pumep.a7/cm ,,7ohwd to an AC power supply. In this circuit, the current,m/ ,u.d7omach7 ppew

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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 changes7zcs-g c n y.,qdbah-;w/odu: by what factor when the frequency is;hn- dc:qo,csbauzwy7. -gd / 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 . zg )0y.nmbwyx55w hkvoltage across a capacitor approaches zero, the capacitive reacyg5wznk .h5w.yb0x m)tance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the volp s*7 tmx7 n*y)tx(ysx,ebs 8nki68lf/ a+wbhtages of the inductor and capacitor in a RLC series )i mtlas x(* xw*e+h876/bs87ys ,ntynpbkxf 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 cig 4bury.6x,4wt xto3zdjbvs:.;e/ zcrcuit 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 increase:)*m c)st38,vm k csihtw xk4zs if R increases. When izm)k*8wtc)3s mv 4thkx:s ,ci s 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 oq* cp.djgnlp209hltxwvkg(ogsz2 7z/u1e ;5f 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 circ3-e piu)wmf a*kqfm5-uit 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 botn579 xqu gp9:j gh ckd aezm9l37(xcn4h double in an LRC series circuit, the resonant freq5c7 a79jcg3dm xznu9lk: qphex9n(g 4uency 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 tgz))6 6.t zp5oaordg/km /f fhhat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series h fd.g6wyp0bnmo-0d 2RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magneticd ux:qoi/rqck+ 29*r e field of 0.20 T. Find the magnetic flux through the loop when the plane ou rrkdoqq /x*:e 9ci2+f 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 ri, ozx6g- h bjz2xs-o6adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mags2zx 6ogi6z bo -xhj,-netic 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 6j xkqayv+ ojg1a6)f1 ita49ym is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an a6t9 a41)q6gi jkvax+1j oyfyangle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reducurxra()7 w +zced 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 changes fromr90pfz 9a-entbb 5j mg0l 3)edu4tu *e $4.0 \times 10^{-5} \; Wb$ 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 a:z0rr*n tzw v9wwr :rf7b63isides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the w3arnv w:7 r0z*:9 zwit6rbrffield 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 wiruyo* +;ofy* vxe with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area1a l 9j 2p5knbvus(2fc $0.20 \; m^{2}$ 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 win f-on 6:k02kody/phu vg span of 60 m flies horizontally at a location where the dowu6k dk0:hp 2yfo-o/nvnward component of the Earth's magnetic field 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 *j i3 fbk.bmq;r-5sxpm long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field o pqb-5;* 3sibrm k.fxjf $5.0 \times 10^{-5} \; T$. 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 generatio/a t7x1/oru or has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of5eq1h+ e f; 5atmcmemxko 0a(7 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 loopk4j yi5)-rt oxz dsn,9s 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 outdj oszyr)4 x9t-,5ink put 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 qcsc:pyc- 5,*z gxziy4 2u* 7n qzt:ywf.ld/mturns 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 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 con7vh yu01jl( oastruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of tha uyhj1l (vo07e rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with xx46in1weypds(i4l6xvol n j *. ft7 i5:x)xta 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 6nu iglvyxggd+bl ,y,4p04 /n4 .00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motou ji i8-lx.g(i pa3 +wnmlo78dr operates on 120 V AC, and 3+wilu-(i l j8d mn ag8ix7p.owhen 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 resistance 6.+;gi+dxglvb9f,mz a) 0 W is connected to a 24-V power supply. The operati vlm 9x)fb ;zdg,a+g+ing current 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 6.0 W is connected to a 24-V power su1lg:luy8i q 1m3)ng*ea9n cqx7ke3x ipply. The operating current is 1.0nyig3qm3cex* 1q7l9u8: x kge1ln)i a 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 resis-vpwx+- :ksvhls wd(3 tance 6.0 W is connected to a 24-V power supply. The operating current is 1.sw:+ 3xdkwv-( slph-v0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage ae 0k2j)lneix .p w1:nof $120 \; V$ 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 tras*u o la*5ckl7 rn43cdnsformer causes 14 A to flow in the secondary. How many turns are in the secondar57 l*dl* sruo 3nccka4y?

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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 pras3o tqu-:sa)q 7 ap5cimary if the 24-V secondary has 10-otap5ua: aq)sscq 37 0 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 *ypiik *) p-gd2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primap**-g)d ik yipry?

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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 ofx+exnvg(h35r8bez ; a a transformer. Assuming 100% efficiency, how many amps at+en8(5vb zeragxhx 3; 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at lm9o 31g7.wkjiis v7m10.0 mA. The primary coil operates on 120 V. What does the primary wmls9mo3 .7vkji 1i7gdraw?

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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 turvber 126mju.z ns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in t 6v.rbjumz2 1ehe 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 it;p+9 ;e glhqgb wsg9j*s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curre pl9q; g*;s+jwbe9 ghgnt 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 turns. If u2v r6dvjqo./7e n vo;the input current at the primary is 100 A, we ev d2.vn/j6; vuor7oqcan 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 twtu3ozr*mp ny 3u) 1s3urns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expectso3 uwzut1 3py3nm)*r 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, r.r ,lbclt;ko.pgo4 turns. If the power input to the primary is 100 W, we can expect the power output of the secondaryct kp .,.rl; rgo,bol4 to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is fp-0t2iut fq *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 sec- fpuq*tfi20t ondary 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 produces5g ;d7yxf9;,k(;bq1x jw/ ey(styou huyv5 ga 60 A of 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 lost in the transm7q tvds y ,xfjx9 hwbygyeuyu;1o5;/k g5;((a ission 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 ai 4xaguwal /3d3 v+i6mt 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 lost in the trl/v3xmdiag+ 6w3 u ai4ansmission 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 lonrahy3 +q6b1fb g has a total resistance of 0.60 W. A generator pr barh3f+1yb6 qoduces 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 linatg dnx)fk)c 47 *kureb ef-.:/w/ sbs8m6xbhe 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due tfs xa x esbn)/-g6kk7/:*8fcwb tmeub)r h4.do heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wouge0 n)2an6 xxp(2no zlld be lost if the power were transmitted at 3000 V instead of at 100 0lg()xz ne6nn2paxo2 0 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line wl64zzyna:id5t( r;yqe5 jb:with resistance of 0.60 W. To what voltage must the generqra( :zn j 64tz:; 5lyeybi5dwator 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 much energy is stored in the coil l0j)up71 jppp's magnetic pp 0)jl1 up7jpfield?

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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. Whatt+ln -cocu4my bf81 *h is this l8c -4funmyo1* thc+bcircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC ciqs l--a. ,a g)fyxu2psu)u-knrcuit 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 isbjxv.wt 4 s),h- 0jbzb 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 the lfrs(*nsfh z.:k 274p xlr z8eyams82rf s:fyzkneh. 4( r7zpl* xp?

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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 pd8*bhaid-8kvpg4*v q,h c8t5( kj luteak current t ,*iqltdc85 8up4vahtkgdvj8b( h-*khrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V acm b0 f6:b0f7p0jbki 6k7 pwq2ls/pewa power supply. What is the power dissipated in0 620j abwbsl /6k0pk pfifpmq7bw:7e 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 5uf2g 8 h,zusc60-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 resb0d; y **vodofistor 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 resist* 37fd akzckn2or 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 reactanclf3k .0wfm)w he of a 1.0-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-mH coil atvol(m92i fjzb,a (sq ;7k3 ftv 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-:7preahh9yhh5su g-w :,t+w dmH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive :mr*w r/.weau1oeo1y reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequencp f z;b+7,ovb:hyo dxh2qw .1sy of 20 kHz is applied to op s:.vzhxh q b,bd +2foyw7;1it?

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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 dued6:ladm7j5.9 s sp rcc 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 reactah(6 sap a cgwu/9,mqt(7c:.0pcxfgk unce of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capaci t0y,vb*g2 1wp xzaci54)zjkltive 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 5mag5fzdbmr 6 d j,zm71 xu90ereactance 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 capacitor .h2k; ltes;o5 v6pzxj be 100 W?sv h;k2z 5xj;. 6loetp

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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 a3qw;:c5r/p+gcsjrur : t th,znd 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 2+vwawxlk+ c: resistance, 15.0 W inductive reactance, and 10.0 W capacitive +a+2wvl:kxwc reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH i(ws)oa1/ )fet;n ya- au:qyccoil, and 1.0-mF capacitor are connected in a:uycqo/ f-as)ei1 ywta( )n;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 Hgv;s5x vyz;d j:e1gur: +z+gjz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie jjvy ;z;ge::guz1rvsgd5x+ +s?

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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 wit g+( t7dnu eenwan0, :;za1b2nphy4pkbd,,fh h a 20-mH inductor, what is the impedance at 100dtb0wba; yfg+1dun2p:h 7pz ,eenah 4,n,nk( 0 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the psa 6z*1vmn9 fkf19ankszm * v6hase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circui -obah*y7s p1vt with a 20-mH coil and 1.0-mF capacith- pasob7y *1vor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in seriexv+*yj l3)fdos with a 100-W resistor and 15-mH coil)*fvxydj o+3l 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 5gz)os rmvfvr u56++ + zn1tzuseries with a 450-mH inductor at 5000 Hz for a total impedance of 4000)v+ n 6s v 5gzfmzu5r+z+or1tu0 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 resi nj:8r9uducf7 a yv(r0stor at 1.0-MHz for a total impedance j8 cr0avunr9d:7y(u f 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 capacitor. What is the impej(zihxo x7/9 mr:ii1 g3pex;ydance at 1000 Hz/xoz7epi(1x; gy :3m9 xj hiir?

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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 capaciton i/t:gtm8om + ja)s1jr at 1.0 kHz for a total impedance o+ jajtsti 1: g8m)/monf 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 negi d-w53yrma, g +gra x)z9ms*eded in series with a 10-mF capacitor at 1.0 kHz for a phase5wy3 si r)9agd , mr+*m-gaxzg angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor atav-8t3 jlqz-ylagx2an5 (rd9 1.0 kHz for a total imped 5(dla9a-t2rnlyv8jzqg 3 a x-ance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the phaodpzj+d5.mw;f6q ;d lse angle?; +opjfzd d.d6qlmw5 ;

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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, anf mqh sb,zwgg /x9e2)(d 1.0-mF 2/bgqfhge (s9x,mz)w capacitor 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 10.0-j bcc/ :l;5 u)iy7izl0/no yeemF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supplei 0oecnclu bl5i/y/7z; yj) :y. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacit*s n, wbmfmx;ya,)b3wive 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 *)f ,xybmww;msab,n3this 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 R:j ,h6*qomo, 1rr 0bcxot apg:LC circuit containing a 50-W resistor, a 10-mF capacitor, andhqob, r j pcmaro0o:6tx*g:1 , 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 resistor forkl(rp4deq/z 6 a phase angle orl d6e q(4z/pkf $40^{\circ}$ 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 =18kbcs2 1a 9vgbz0 bky 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have mk1ab90bs21gzcbyk8 v aximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W rr 7+v*e m6l yo4fl+yvmh3n0dc esistance, 15.0 W vo4y +el m0vr hdcy6l37nm*f+inductive reactance, 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 ajqbt t7osi+2htr/ 9mq(0 7 fopn AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impeda x0+sbe 7 ntm5;wsmmd:nce of 60 W and a resistance of 30 W. What is the power fx+07d m 5esmn:tw;mb sactor?

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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 co(2)uvq/l*t if lwqk70( jbk kqntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when kkqlivlw (qkt uq20*(b/j7)fconnected 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 freque*ov*0i2wn40kpls7 tfpc pjt8zi50n f ncy of a 1.0-mF capacitor and a 15-mH coil in series?2pfkv0sn t*0izw0p5 f4 8o7*p tjicnl

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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 wzf qqu :.mg6uasjj---k od y;s(uq-m(ith a 4.7-mF capacitor for a resonant frequency of 10 - you. kjjq(- as-muf(6d:qzu g -s;mqkHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a reson) j 4ro+b9mllhz qgkyz(,g8 ;rant frequency of 10008l rhl;mjzy,gq+bzr4g 9o)k( Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-k,q*8bx hbys; W resistor and a 40-mH coil if the resonant frequency of the circuit is to bbs yx,q8*h bk;e 1000 Hz?

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