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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux; b r;fq5,oe8-pcznaa/ av ;zkd0ete6 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 statesm v p.052ps*je5mbiddp j+ g79sc ydm9 2ss(iq 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 pr4 ar nw m3qc:-u.au-szjil +x*oduces what kind of change on the ina:+*3ns 4i a-m.xqu zu -jwrlcduced $emf$, 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 througrztve y(c1* cg2-i+bc+dy k )lh a loop of wire produces what kind of change on the i bc+l ykyvrdc +t1*i)2cez-g(nduced $emf$, 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 bbt, wg0hmjapl4mp c300/b3don the induc40wlm 3ghdp,bc0bmj03tp /baed $emf$, 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 cg*sp4vckxkl3 (umkw 463 .qb 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 n/9xu4 bklhb 5k0yf -finduced current in a conductor will be that whicfyx4n kf/b5l-b9h 0 kuh 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 table. A bar magn;5r5-s )a pmrw6a kt2o )phos,xbu ,vhet is held above its center wikh)aw m6b ,v puh2t5as)s 5p-xrr,; ooth 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 o6 tsr43:, uwshtjs ln5dv30smagnet is held above its centersd6wu5:3ls nvs3 4t oh0,jrst with its north pole pointing down, and released. As it approaches the coil, the 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 ta),b cw sjb0ut-ble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fb jws-b0t,)cuield 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 field v.n 5omnw oe;m2ector points straight up. Thon2 e.m; nwm5oe magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a he ;bj qh14pwt-orizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fieldjb;t14 pqhe -w 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-increa m ln8m fu9ka,;2:d :drybpn.using current northward. Two coils of;.mdad , m2bpy:8fln9nruu :k 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 northbvedt z 9+/1nf q7ur4;wp u9tc pole entering first. As the north po1;d fzb/ qev+wu9rttc94 upn7le enters the wire, 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 wirfxgyn /n6rgi:u0gp2 ty 8j d.rh+/sz5e is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fieltu8p.n +jyi/y6:rdnxhfrg5 g / 0z2gsd points straight 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 angular speed about an axis whoso8,hxyyq* : n42xarw le direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of th*q ow,x8 4n:yaylhx2r e 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..p6kuw2 ;adtkq,w. yr
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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 thatij65;p v1zrvcuhm dc:x0s728o0jc m 0q kjuq3 an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fie+e.j( mpcwq-xfef4y1d1rsy9)(jx mo ld. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved nortjc+md -8ug)vp xmzl( .hward at constant velocity through a magnetic-l)+8j ( umpgdvxmc.z 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 rotam jkkqk-c8+ntj-ah o60g5ff 1tes 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 transformx4q3jpk9 yz g)8c ywa0s

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The freques f1e/6fxwq )rncy of t1fq) xe 6wfr/she $emf$ 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 usecf7l2w nj0:uad 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 devzg 8,x c+uk1vgxd6g +vice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops thh+vt8t-ro8 dvan the primary coil vvttd-h+ro 8 8then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if l 4/3lfx0mxg uthe primary coil contains more loops than the secondary coix gl3ux l40/mfl then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inputk spsr8-wq- sm6pcbd 4a w8 3apdgc(,.

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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 ciz+5hptgr t6o0 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 up 6icb ud1kxg0o-5.z are connected in series to an ideal battery of constant terminal voltage. At the moment contact is madedgukzbx o5-.uc6 i01 p with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batteoy7cnl35rd2 a q r,o;gry of constant terminal voltage. At thln5r ,cgyr7od 3oa; 2qe moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to az 5. vj 9egqyc1(wmkbxe3m6r .n $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an pzutd3e; +aub 6fc4.d+owj;h $emf$. 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 arej1 xd5;s sbwr6 connected in series to a battery. The time constant for the circuit represents trsd651 jw bxs;he 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 battery. T wow p)cu9cbzo8b7/k3; 2ijryhe battery is suddenly removed from the circuit. The time constant for of thk7 c2i9w w/8y;bb orujz)op3ce 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 5;ie qeuq847zrtd,yc have 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 power supply. On this circ :3*x:/qe)qu.e ecatt-jcel9o +d qcpuit, 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. In this circuit, th0wam2 f)m; ixue curren fm2m ;uxawi0)t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what fa 3 mvh+*axgxii.b3nnj1r c()e ctor when the frequency is tripledngiimh e*nx)bv car +3x(.3j1 ?

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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 theoj oes0xs3d4. AC voltage across an inductor is doubled, the inductive r.x4os3 s0 oejdeactance of 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 A-lg5h8np x,rhC voltage across an inductor approaches zero, the inductive reactance of 5-hnph ,g8 lrxthat coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In thisk)mo.9q3/d7mge jzun 46eh h rr)d4vt circuit, the curren hvh43g7d6qo z4d.)r t )ue/9nerkj mmt

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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 facto+,pf avandua f2n230 ur when the frequencn0 d3,fapnav2uf+ 2 auy is 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 voltaasix b6a:w )5mge across a capacitor approaches zero, the capacitive reactance of that capacit msa i)w5axb6:or

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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 voltagesii(( qrm /5k.gq2jpc 4) vdauw of the inductor and capacitor in a RLC series ciru(kpq)wm(5. v4 /cqjrdai g2 icuit?

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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 ci/g o bll/1hgi1rcuit 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 t3ry8un +)ds ncr *m7(+t,mplr 8dpadkhe circuit increases if R increases. When is this statement true mlrcm yr*8up 7k)a,sd8+dn3r+( p tnd?

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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. ,6hn71hutxaz The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases if k1ov;) umwht1 $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC seried o7 /wecte- c6wy,/on(6 yones circuit, the resonant frequency y6oo6we /ot(d7/c,ce ywne- nof 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 thatcc( :h6;z)fwmo wr -/bi 2rush 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 RLC circui6+ w1jhh 9d9lz+prq bydxv .e ol39vj.t 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 magne -0c0s /0lhruyi4m(fgtac1 petic field of 0.20 T. Find the magnetic flr-001a0cg 4fih yup( cltme/sux 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 ( 8ybgo om+bz)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 tgbym (8obz o)+he 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 in a uniform magneyzysl9ylaks 9on1)02 tic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector 9yy0 ) 9k1l2noslyzasare 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 oma0n j as-c; dsg+-9w(xdx,uvf 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 from5 3hyp afelx9wlj-2 t ;zwp9r7 $4.0 \times 10^{-5} \; Wb$ 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 rf99l5a;5ydfwnez d 5alx :g8 on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, finda5l8d adyz 5 99f5xfew:;grn l 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 an area4enn+zfx3a s( y-a6s bt ;3wxx 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 ani9qfh4 4 e1ytad area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location wh3q/y juf gjk.gp /c ;u2+5jhfaere the downward component of the Earth's magne/;cj fqj /5 +guhk3. pujafg2ytic 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 tha tnhk 06nw5 v.*pfy4jkt is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis thro0pf* jkyt5 knh4vn6w .ugh 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-sectional area of8m qp4psio*c yw8;fg 6:mdm3 z $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arecc9;dph0 xh iw2y + + +ou:vftki6mhr:a $0.090 \; m^{2}$ 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 rh1szx6bp7-hr64z i +auddi *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 uzp+ 4-du*sazd7xh6 ribi6r 1h niform 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 cons ,p ku92vw2apiists 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 generator with an output of 1js:d0 ; qdgww (syr bm+um k7ps6 hm)mp;6q6,z2 V maximum when rotated at 60 Hz. A magnetic7(m6+;): sd j6mhrmd6s0;pgw, qbu wzs mkpqy field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wf3 qt70re3 3,/tcw, pbxt )d: jmfry8jn5biffith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance oixt/ xmij)- c5f 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 motomx 9 .*y)oct6ozmbaq)a0s p(tr have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed(9bz))saa*mt ompt6 0xcy oq. 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 6.0 W is conny vm uh5)/p;nu+ dk5gnected to a 24-V power supply. The operating current is 1u+ /uvngndmh ; p5k)5y.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 conne f*jkk nrb.ls68u+i w7cted to a 24-V power supply. The operating current is 1.0 A atfwn. 6 iruj7*kl+k s8b 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;(adn-c wskr,qk,e g/ power supply. The operating current is 1.0 A at full speed.k-(kg,dn; cswaqr,/ e 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 .eq2uddql98 d +xrg ,gneeded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transfor;.i y5e)thp7 0dei.qk ityw o)mer causes 14 A to flow in the secondary. How many turns are qh.ewedt ; i))i5 i70oyt.ykpin 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 pg;z7r-rbzi 1 y(e d6u1we4eeprimary if the 24-V secondary has 100 tyueb61 ;gee wz-ir(p z41rd 7eurns?

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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 seconda)ex7:wp mt5ull91 gvt ,,xdogry coil. Ifg ud9l vwx l:) oe,px,g5t7tm1 the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% eff q6igzeca.+sx ry1k; +iciency, how many amps at 24 V can flow in ck.ies6;rxy+z 1+q ag 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 provide,l2jy11n fk qxs 7500 V at 10.0 mA. The primary coil operates on 120 V. What kjf2lx,n 1qy 1does 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 tu4e1nv4n9zvd lrns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what 9n1ezd l 44vvnvoltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its prima.v c9s thz+ufjinb 8*9ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the si9+t8sv*9z hubf.j c necondary?

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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.tz ,(fiybh i -s ji337 s2if4vhq9ivf+ If the (y,ibq+9 fzhvitsv724f- hif ij is33input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns a +p9/ arokbri8 )rh/zjnd its secondary has 200 turns. If the input voltage to /ah/pi8zk+bor)r 9r j the 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 transform e1w,1.fbas tker has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary tbk.s,ta11e w fo 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 (v6h g(s ener-A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a pow-veer(6ng h( ser 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 vola- w3nh/0kr zatage is usually stepped up to 4500 V by a transformer and transmitted through a power lik30whz nra/a-ne 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 v+oel usw+y ze);ukijq+6,3 syoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the perce3ey u6s) z;ko+wqij +le+sy ,untage 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 resistance of 0.60 W. A genbovc 8uc7)b-eug rf*, erator produces 100 V at 70 A. In order to reduce energy lossvob 7g8,fc)rub e u*-c due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W.hphj1lc h0 .;vaqi/ x7 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. Wp7hhv10 /lh iqaxjc;.hat 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 6wigh ic*hzi ,-z 86gi0h(zt)lix0wi--W line at 1000 V. How much less power would be lost if the *,h c lz ihiwiwzzihx--it8gi )006(gpower 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 at 20 A. It is to be transmitted on a lw :;z*: 26)kqmd;)y scamol 9gwthh cqine with resistance of 0.60 W. To what voltage must the ge69wq m):kqoh2g dz;*c; s:ly wmcaht)nerator 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 cu8kp;w,neu-6mg;puj3 3a db 4- tc zlwnrrent of 5.0 A. How much energy is stored in the coil's magnwl dpkmzaj-;8; nn egu 6c3bwtp-4, u3etic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W ri5eeq;hm7em , q sxtfj8o.z) :esistor and an 18-H inductor. What is this circuit's time constant?;mt7)z h:x8qfe so,mq e5.ji e

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 i ;w gjls3s( 7-iyyye-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. Whah.wxk/h o 54++yakh ogt is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. )/ n nwy376s+gdweio g u2a;nxft)g: jab8n3kWhat is the resistance of the lamg2)87o:eig/n s ;wyg3nw kba)uanfxtdj 3n 6+ p?

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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 1lrkzvultkd q.4 j m+ /2,y0.tg20-V ac power supply. What is the peak current through the resi,g.mq.l+4v k2y 0uldj r/ tztkstor?

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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 izf w1zsj3n b l3d(960v/tgr tis the power dissipate3/dzjfinzw (bsv 9rglt 31t0 6d 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-W resiqx.qa1zr , qc/l+kpm4 stor 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 50uk* : *i927lbid nqmox-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 resisttd dat2)w(m .br)yh h5or 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 w89 neo0o/8d xlqvt r.fbq .k01.0-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 inductivyn)4au25zt cd-emu b5 e reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactag jf+fbrz583 ;*ktw qance?

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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 Hzpp(hhp*3u 7 isr5k7bm?

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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 t( (8xxshkz9 mfrequency of 20 kHz is ax(9m (shkzt 8xpplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.j3mw;7p d :,g 3dihdqhug 9o9b50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 uw7nst s2p/y /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 cl :zg7o7fbz)ovt+ 7icu mb95l apacitive 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 hav-(/ kebrww(4/ vi ayawe a reactance 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 o (koi)ci.1z)xd/cnim5 sy w .of a 0.010-mF capacitor be 100 Wso)myi ikzc(.)1. xn owc/5di?

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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 Hnum: 73y. pxfcz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W o93dq kfxc:z9resistance, 15.0 W inductive reactance, and 10.0 W capaci9fq 9: ko3dcxztive 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 coil, and 11ay oghwndhp.1 syhrbr67l1um6 o;. 1.0-mF g 1aumwl;ph n6sb1odr7ro1y.6y1.hh capacitor 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 iffnw2c-kqy i l0d6u4-u a 100-W resistor, 20-mH coil, and 1.0-mF capaciw 0-uq4cy -dunflk62itor 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 inductor, t1wza: zbh2 28 w7 we webtq16omex)+mwhat is the impedance a e bez1)8b:hqo+e72 mw6wtt1wzx2wm 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 resistor is connected in seriesf)2xcz8u3l ti// oz r+lrc*rl with a 20-mH inductor, what is the phzul*zcxlcri r/t8/2 3 rf+lo) ase 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 circuit wi kffjo: nek9;k0 s2xg5th a 20-mH coil and 1.0-mF capacitor for a total imped ffn;9x ek5k:jgo02 ksance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor lzj+n h izaer2vgo138xp00r 0 and 15-mH coil to get a total io2 h i30+n8az0gvzjxr0pr el 1mpedance 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 in9+b 5 ;jmb8 h)fydm +zek)ksm n+8egmuductor at 5000 Hz for a total impedance of 40000 ed8jm+sf kk8ymhb u)e9bnm5 gzm +;+) 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 w k6ph1r:dfbe 4ylz xd a406p:yith a 100-kW resistor at 1.0-MHz for a toedp061zx4ap 4lby6 kdhfy:: rtal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is thg 2tnz)w.+o wae impedance at 1000 Hz?)w .ongawt +2z

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is n3el63d7 ;oiuakn lu5f eeded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 4556o;iau3l l3k du f7en W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz foez3 -ae+ec ptp,;ewq;ip ;o7wr a phase angle ofe;+,ezwe7t- p ppqw a;e ;oic3 $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neede 0kgx3apsy n36al .i+ld in series with a 30-W resistor at 1.0 kHz for a total im np ygxa6 3l.0k3ias+lpedance 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. Wk 4zv)gs*zk0prnoz1 /hat is the phase/vnz4)ksr o gzp10z *k angle?

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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,o+.oc/zoq ;6s k ustzq 0y 6xen/pi9:l 20-mH coil, and 1.0-mF capacitor arou6soq:+nky et; 960x iz sz/.loc/p qe 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 10 (hx4.qwbw*wn0-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. Whnw4q (xb.h*wwat 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 capxuupp zekf6ijbi s; xd*s 51+z)0j; o(acitor of capacitive reactance 30 W, and an inductor of ind5iju +j;0d6i) zpeu( s*skfobxpx;z 1uctive 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 vrbg6z4 fck7vzvn7qf+t 72( h for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hf+4kcz77vrbh 6 nzq2( vt g7fvz 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 re4pr,xl; tom/ c/g4hn83ead m xsistor for a phase angle of,ro4/h8t 4dal mxc xgp;em/3 n $40^{\circ}$ 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 hasl3uouu9y p5m pa4a/ btg.wr :3 R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum powe :bug3up594aw rp3. you/talmr 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 acxmftul 484zb;x i-kufc ;6a (3dryr)p series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacl)t 8y ci;bpfuz3r6urx;4( -md xk4 aftance, 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(izpr *vseb/ct j+ g;7 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 impedance of 60 W and a resistance of 30 W. Wa2cp5wwng 4a/hat is the power fac /ap5awwcgn42 tor?

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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 fa3 ev 1mvh/klm)ctor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, 3)ev1mhkl/vm and 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 capacitor and a 15-mH coil in seris7-u 35w2gaxe lh.n jzy9w ,tqes?-s, x.wqayz nlh5tw u3j92 7ge

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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 resonwbna g/lmy9 1c rx4-p)xlx (2want frequeba42x-) cxny1xwr (l/plg m w9ncy 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 series with a du q ro0,xfuebj7dmbu,nz42e ,m))/r ij(yt1 3.7-mH inductor for a resonant frequ14o)u27zj ym ,m),xjuder, t(i/0qr ubdbf enency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be place 7aqldt:wf/e0wdx1 :ed in series with a 30-W resistor and a 40-mH coil if the resonantldxt7ea fw1/qw :: 0de frequency of the circuit is to be 1000 Hz?

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