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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 unitst0b0:7jklfr balj*se 3 6h;ztb9agg 3 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 induclt 0)m- q55o(y:gul wxz-v gzt.qifs 8tion 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 im -mvrz; 5gb3on a coil produces what kind of change on the induced vmbz-g o 5;rm3$emf$, 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 produces whatzkdx/eh: 8er. ;1)zbml uroh )7,had mf l6hx5 kind of change on:hr1)7;d,)x.zul6bozmh 8ard 5 f keh/xl hem 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 chg61zd-9b*(m n wqbicxwu9p1n ange on the induced w1* i p nbxg-qu (n1cdz9bw69m$emf$, 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 febh9 f)or, ddu(t42oqrom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a cjo* hmr1.xd;lonductor will be that which tends to produce which.*hj;1 xordl m 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 bardy8o h.rt1 e0nm*k5azu.q 6gsdan n90 magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewe1mq0.ekg.y5*u d9 nt 6ar8nd na0shozd 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 horizontag; 4vlmghv0n d,x t98il table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling ma9dt8n,h 0gi ; v4lvxmggnet 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 tabybyzfy 9 09llgwh fjw/z:) -8wle top in a region where the magnetic field vector points straight up. The magnetic field vanishes sudd zj9b08lfy: zf lww/h wyy9)g-enly. 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 o94qbyn qa 3.h )o:5oh6zxviy magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in t:o9 n5bqhhovo )y3 i4.z6aqxy his 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 jt4 uw5h3anz5top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of z 3a jtn545wuhthe 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 ever-increasilb5w /i ig4lo1ng current northward. Two coils of wire lie flat on the table, one on either side of the wire. When vie5 1/ol ilgw4biwed 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 4 qo; hzmxd: ka;in;8+tiwwb/of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed frbdhnxkqa+:m wzo; 4;;it i/w8om 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 ai-xpp02.cxyc2yer2t* uv w,t f ; 0crongular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straigh cct,r*2w. ix0t pf202ecuov p;yyr-x t down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant a9,bp55..jhjxi era,a;yp d/uj f q5eongular speed about an axis whose direction ca 9fojpq.jed5.e55 xab/u h a iy;j,rp,n be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.2/uvfi+7vz)z z*zfs p
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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 thah- oy4xslk x6ubk2i gcky(43it 7z;5qt 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 magneticm3(4s tqzh l-e51zamz 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 (oriente,xf o8/dglh5l9kyyc a1cq *z /uozp57d in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potu cg//,fqlc h5k9*1yozx 7lo dz p5a8yential 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 an;toh f.jkqs *j ol/l3h3j:7 zrgular 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 transform66 (h0zkj6ttyhmaw2 uih39n ws

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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 ewa; 1mb ta no9upuv4.vy*y;u4ach second. The frequency of the nuw4 9a bav4um p;1ouy*;ytv .$emf$ 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 togpo .a+,tn (:p f+yqyb

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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 deirb 7q* 8yxqt70 p7fuhvice 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 tz*7 d:js8 g+coseo ub2owo 5a+he secondary coil contains more loops than the primary coil then +8docgbo z so: + o*7waes5u2jit is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops th5qd q pet-.a;nvj(d 1can the secondary coil then it is ad.- 5jeqq1(a ;tpnc vd

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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,x0z n4ytvv2d 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 cirqfo zm-5 be30ilow: r:cuit,

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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 nw2n2 )a ts7k kbjh.k;gxd/v(series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, tkkd/;)k2v xbnn t h(sj2gw7a .he 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 sebbdch2h 4h83 kries to an ideal battery of constant3kbc4dh82h hb terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L a+ 8 :dyo ara,3z1hxyaand 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 and ;r m5bm u k/eqq((r/edresistance 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 conneiak6 m2u/ggxp 7b p2z b7p/hoz jan(+.5f5zitcted in series to a battery. The time constant for the circuit represents the time required for the currg7jbub6x7h aaztnpgpmfkpz +5i ./zo2(i/2 5ent 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 in7qyf9v6 3 l dl(;kaszx series to a battery. The battery is suddenly removes;d3a9xyf l(k6zq7vl d from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units j;e/zmmt* s7sl hj4rb7ku8j5 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 ur-7r3n+ o5ji+ amw 5la-f qdtpower 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 connect.ke-x82 ybcyted to an AC power supply. In this circuit, the currentb.yek8y2 -cx 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 c0x2koq0w w( zzircuit changes by what factor when the frequency is tr ww00(ox 2kqzzipled?

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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, thdm8cj tc5k,s9e inductive reactance of that indu9kct5 ,sdm 8jcctor

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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,u- woa ,4i vykx,2h0fs the inductive reactance, ,f k4iu2ax-s o0hvwy 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 tzy wu8, b.ikk,-s0erdo an AC power supply. In this circuit, the current ebi-8u,rs wk k,z0dy.

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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 the fre67siu wfh i:ksny33)gquency w3uysfn) sk3ii 67:ghis 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 voltage across a capacitor approaches zeiiok +lwltm-77;4cgqu 2k1j p ro, the capacitive o4;- mig1lt7pku7cq l2w +jk ireactance 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 ang4jwea z0pc/ w9rb5op1 le between the voltages of the inductor and capacitor in a RLC serie9rpoe z1 540 j/pwbawcs 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 ci2 a-6b0bjux*a c2 bej1em (jaarcuit 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 increahk)af2 u)oum;ses if R increases. When is this ));kafum u 2ohstatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incre z5ykc q,1aqw2xyf-x; ases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases i qhc;ovdag3:k0nc6 )m49x 9 qfc9guqj aw1m d+f $X_C$ 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 te -d9/ rnsoghub7ng x-s49t5xhe capacitance both double in an LRC series circuit, the resonant frequency of that circuit wills7hb-gdn x5t9no e-ux /g r4s9

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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 resonl3g+kg2b17:7bqdm 0 kpbf0exynsjg- ki6 yn 5 ance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a seriesg;a :x(jqin gsv-e2 q6 RLC 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 .pir2ii(. p i/ozqy +qa uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop az q i.q.2 p/+oiyri(ipnd 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 / zff;2;h5e8j taigu+x 4kadxm is rotating in a uniform magnetic field of 0.20 T.hxuk+i/2 84x ;ga 5af;ze tjfd Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating i:ut:rcxjk4bt 72o c* ln a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when ttuj xc*o2k: l7 :br4cthe 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 l bjwpzjc*568 an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from ,m3v .rc 4s5so xqtmji)ln5i6$4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. Ag8ip us /wukg: 5h;)my uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced huy/mp58)k g :igswu ;$emf$.

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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 anob*/n g dxg81d 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 areg/2 .dmh4,tq /qrdrqla $0.20 \; m^{2}$ 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 fl kq-), bke,u9w1:9iafcsu xdt ies horizontally at a location where the downward component of the Earth x:,t,si)bdfwa1 equku9 -c9k'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 99bk;dtn40:k sh gbgtis 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a k 9;tbkstnd49g gb:0hvertical 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 cross-sez)k(t:u,x dc nctional 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 consis u dn,wx3nwg* ,vj:s b k6(x7gps)cd0bts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. v7e8ivw36qbn1jne, z f s(u )iyks i3/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 8iz7( k1fivyjs6n3ne3)q, uwib s/ ve 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 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 consisj da)dvs*3f3pxqou/, ts of 100 turns 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 construct a simple AC 0unlbkcs30m +nk n0:mgenerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field bk300unk m :n0l snm+cof 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a -tj4apo0pup tv *on 7wg7erpi 9 6w12amaximum $emf$ 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 resistanyvqr:q8dl9p c:u ft::ce of 6.00 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 resistancetjiwr14h g 4t7yma,rrvk1d *: of 6.00 W. The motor operates on 1d*4ma74gyr ik1 rj,tr t1wvh:20 V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal rh/7 53df bei.o9fv:czqpa5+ e bb3ds cesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up ccedqe3z5:sb9pof. vh b5i3bdc/f7 +aurrent?

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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 conne w uhn6b-cgjb7d6.* licted to a 24-V power supply. The operating current is 1.0 A at 6 7 *bbdg6 -nwc.hiuljfull 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 supply. pn0 :kbqn w4)zzkn .i9 The operating current is 1.0 A at full speed. What is the ba n.)bqzk p04:nwnk iz9ck $emf$ 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 t7d-u0cjwkrj 3vhke/ kx;35pa o reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secahj ;f ( o-xtudshg1d-kbbk( n(15zz+ ondary. How fh sbk(un5d ;(+-jba-dkzt1(xg o z1hmany 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 24-0ls+bctrxpd8) m;9k ;bp de5g V sec+8p c)sdg9krp0 xde;5 mblb;tondary 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 2p5*q lku:.6d)jh yd ox8q*zjo000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current5 :qzhq x*odylku j.poj)*6d8 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. Assumingo7x2m yvtd:) b6tksoi 6 trvug20k3)f 100% efficiency, how many amps at gk:d)k3t66sxotb yf vo)2 vtm27r ui0 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)ah0q hqaemyt1+p )f nxl-6n: provides 7500 V at 10.0 mA. The primary coil operhnnp lq:y+qx)f1ahe) m06 at-ates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil ang-iwpdr( dxwv- 23g,/z :jntovx qb*9 d 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in thegvwv3rpwn /-i* dx-9(,tz xb2go:qj d 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 pri*vno*fa t, ia 1c1bzu3mary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied too fv* i13ca*un,t1azb 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 tra:wl3 hq9o0ruj * 0/mvkfs(assnsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current akfo:a qm j9lvr3*uw s0sh(s/0t 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 200 89m +n tgenr;rwiun:. turns. If the input voltage to the primin +rnu9 tgwem 8;nr:.ary 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 e p0w.y,gic,s200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary e ,gw0s i.pyc,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 a0svgp vu8a88. The voltage is usually stepped up to 45v8 0pa8v a8gus00 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 12cniea* bcc / 00s7ldm20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a poweiec2ac*b ds7 lcm0 0n/r 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 of current at 120 V. The voltage is usual5sb b;boog cef n8k41rn / -yb6dmf2/rly 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 th/mgb6b8nfon5 eb/;fd1b-r 2ocyrk s4 e 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 W. A genera6h3r+ x yrdt-ntor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the volt+dny rth3- r6xage 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 ge6x5yf.i59epz jn1 sstfja1k4nerator 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 tuj1 zfesskix54 1 5pjfa9.6ntyrns 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 dow0;fc 8t i5(tgki 3nfzwn a 6-W line at 1000 V. How much less power would be lost if tw f8tit3(fc5g;z0kn ihe power were transmitted 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 a-)vyb)y.ph a b1av :a5ct k-zut 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the originala1 yz.av):ktb-achvu 5ypb - ) 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 s )r00ip2ex-vvk kby)etored in the coil's magnetic fieldr-yx b2v e)0kkveip0)?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is thi2vcf;ejsy m 0.sl gk(db-7f.is circuit's timeds2mf7l0 by.c .vk;(is f- jge constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where theclec,gype cb8 j99 r 2q,9snl5 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. Whauh,e/ y 6nbdj24tkb: qt 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 120p vv,r-0zk*;55qt cr zxeqb 9f-V AC outlet. What is the resistance of the laqkcrevfb-v9 5q ,t5x*;0 pzzrmp?

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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 actbq *(mkpqnii28 4y: 1 h3ynoh power supply. What is the peak current t28*1n 3o(h4n kyiht yi p:qqbmhrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power s.fkmg24bvd l,vf n*p1 upply. What is the power dissipated in tfm1pfb, gv.2*4 nkdvl he 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-W resistorehu/f.f3f pi5 f(jc9/ hmp 1am 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- hwnb- /l o/clsw)y2fnd8 mv.)W resistor 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 v35kf62lwqggcb lf 62or is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1* fwxb+evp; /u.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 at 100 0i;ls7199lciq x0 ozdl j*vxt0 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 f4l;:u ftmqm:14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hzxm;ny4jl vz3te,(ks; ?

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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 m3d,fj(k ow obx:3e3 fof 20 kHz is applied to it?3m:defxjw3, k (b3f oo

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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 coipaz, y25c, +t 4pp- d2ibaxhyyl due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of 7 c o*o rcmqek11o52gga 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 reactance at ah5y1so.oay. 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 reactance oboj1j*y3( 2bm ,hxddh f 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 be 100 W2s9gjltl,fa j /z rx2.*reyy5 ?erjyr.js/ga 9*yllzf2t52,x

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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 +irn8llvc/ev7ltwm kv ;: -,hat 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit fby-8u9p ;rs ebes3/j with 12.0 W resistance, 15.0 W inductive reactsjeuf3 9pb-/8 sby;re ance, 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 i 5) kn4kia3h3it)lcxef a 100-W resistor, 20-mH coil, and 1.0-mF capacitoin 3tc ix))a35ek 4hlkr 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 resu;rmn. ja(l-gf 0p4df9k gk7x istor, 20-mH coil, and 1.0-mF capacitor are connected in r4 ( 7-x9 0; .mkjulpdnkafggfseries?

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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 iw:y xj*. 6;ya wwi7utin series with a 20-mH inductor, what is the impedance at 1000 yijt;76. a*: yxwuw iwHz?

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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 tvrowfoa h /m20-k .s)ghe phase anv/ha r)gm-o0sf .wok2gle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 208rys1ga ,g.)bua bmkr0kb)p7 wbr ;e: -mH coil and 1.0-mF capacitor for a total impedance of 100 W atu .wb8m gg:1a ),s)k7kpr0arbb e;ryb 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 seriiugfv/.bi 4 u7es with a 100-W resistor and 15-mH coil to getuvi/.uig4bf 7 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-mH inducz7f:5rfagur jjxlo: )+dql6i +e z*s7tor at 5000 Hz for a total impedance o afu+zj s57g:+*f )r7rl:zdeq ix6ljof 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a o f icy)f;o2g+100-kW resistor at 1.0-MHz for a total impedance of 150 kW?fiy o ;o+fc)g2

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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 i3 eqa45d*dk4lf nr9sw n series with a 20-mF capacitor. What is the impedance at kdd4 q93anrfs4 w*5el1000 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 i4r n ofd:i o6p2wb,z-in series with a 10-mF capacitor at 1.0 kHz for a total impedancepbno2o4:iizd 6r ,-fw of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacito -neml l(+zvngb(58 hjr at 1.0 kHz for a phase angle leh(v (ln +mjb8-5gnzof $40^{\circ}$?

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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 t d 9nzbd)xwzm ,ak n;jyf74-5a 30-W resistor at 1.0 kHz for a total impedwxn7d 4-,d mtyk)z9b;5j nazfance 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 capacuv+ltekmxn/7i 6t5d z1xz hv, u,(xa-itor at 120 Hz. What is the phase angle?at(,h /ix-vlx16d e7u z 5,+txumkzvn

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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 Hzud/ v;(kihq 7l if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectv d/ hk;lq(7uied 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 rut).v d8** n9je kwnxnesistor, a 10.0-mF capacitor, and a 0.350-H inductor. T.8)*k*n ej vn9twuxndhe circuit is connected 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 capacitor of capacitive reactance 30o2:ksej+xjhv4uu m;q:t6 5qwr f s, 1a W, and an inductor of inductive reactance 30 W are connected; vao+j6:wt 2sqqu ux5 f:k,4jrmhe1s 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 seriel3ba1sm leb4* ly 3rg4fe* ri:s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45li a34 e3*1fry*bge4sblm :rl-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 for a p(x .a tsyj b-i4l;njuv;: +bhnhase angle o 4ji-:h y uv.a;tn n(+;sxbjlbf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At wha 9;d ;nu5zmrjlt frequency should the circuit be driven in order trj; dl u9m;n5zo have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15gasippa9.fwr 7 ztu7 ma 7m1b)4 l3ne-.0 W inductive reactance, and 10.0 W capaz-s7atm.f3e 7b1r ilamp 7pnu 49gwa)citive 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 anzpe8pi0 : 9zxmzw)d o/ ..3 pmintvhd5 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 anhzsq-ev q)7a 7 impedance of 60 W and a resistance of 30 W. What is t7eqq z7s-ah )vhe 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 zdd n-6yprhf8bn84y( series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supp (-bydfn8d8pnyh zr 46ly?

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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 frequz yqk9it 3d8y;i4 wbl3ency of a 1.0-mF capacitor and a 15-mH coil in series?wqi39ly3bky48di t z ;

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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 war9;a 7mr*t (p2tv u(/eei r/:qo knqiith a 4.7-mF capacitor for a resonant frequency of ;r(/aq ai: oe97m(r /p tnrt*qievk2u 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 se6wijd07h i jl:ries with a 3.7-mH inductor for a resonant frequency of 1000 Hz?76wihji 0ldj:

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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 30qw o0 1bjoh0c0-W resistor and a 40-mH coil if the resonant freq 0q0cb 01jowohuency of the circuit is to be 1000 Hz?

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