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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 are units of magnetur( +- ;vidp.vma 1c hvvh4ho)ic 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 statel/g7pbm n+f/ oe-f+ lps that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of cgbb 8 3ayhz9xh97f;hx itu 83ehange on the iny33e98gz ha87th; fixxhb 9u bduced $emf$, 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 lo8 ob0wvj s*y3bop of wire produces what kind of change0yj8 b *vsbwo3 on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of x7qz 3ca ;i uy,7 ze0eaiu*/hewire produces what kind of change on the inducehx07 / aeez,; 7eauu qz*iyci3d $emf$, 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 magnetis4qz-cy.z .ljg t+5 jpc 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 oux -r ,3dm4rvof an induced current in a conductor will be that which tends to produce which of the fom-rr 3ouv4dx,llowing 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 +j/z - )wc m6aq9mapne ebu89smagnet is held above its center with its north pole pointing down. The stationary magne+ 9 sp6e anmb8wej-/camz q)9ut 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 tablevetx(:*+3zso0x u90dq , rr tc x;fsxj. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abor +:3u0s r;0e (ct*,zjxdosxtvfq9 xx ve)

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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 the m (suo).azehfu 4 rvv 5y4i:tz-agnetic field vector points straight up. The magnetic field vanishes suddenly. When.e htsuf5 zi(-4va:r)v4 ozuy 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 regiovf,s 50x n w4thb*j,xen where the magnetic field vectorx, ew4bjvtnf5,s0*x h points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as 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 twvma .. qa894dle1yso op in a region where the magnetic field points straight down. T489..y1emalw adsqvohe magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horiz+e3g13j xopx uontal table and carries an ever-increasing current norg1 j3xop+uxe3 thward. Two coils of 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 loog. lo3lp9l f)yp of wire with the north pole entering first. As the north pole enters the wire, the induced currentp 9lo3.yl f)gl will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about1 dg*ql43cok x vgi0m9 an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be th3m1*voki9xd4g c qgl0e 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 isi-3 dmq;7v ojk rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points sj 7 -i3qd;kmvotraight 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.)b8p eed5i v/ba jab65q-6r r2h 1qjpt
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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 76v2h len/gdlr;xd*x 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 field. s la2/hc/)eau2ddygf8a tz47The $emf$ 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 i 7tk1gx0qi6uan the east-west direction) is moved northward at constant velocity through a magnetic fie 0 1xitkaq76guld 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 rotates at a constant angular velor)77z as4 awfacity $\omega$ 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 tra 2-u1ikku5r;vs g ;y :kihvb:jnsforms

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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 fbstufpz+p/ /;pv; z,xrequency of t+tp, /p;v/zupzsx ;bfhe $emf$ 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 de5+bo ie p*n zf0ee+ 1x(ozv(hxvice 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 devicet y l(:wtxrr.( 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 c4dds+-e/ vyukkn: j5 boil contains more loops than the primary coil then it is adskj+n4yu:d/5 e v bk-

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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 p1ar; jvob :drgfd j*4q o-9f4hqv*:qdrimary coil contains more loops than the secondary coil t:*d1 :*jjv 9 gbv4f4-rq;o qrfdqhod ahen 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 powef u yy+1ivg8x1r 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 circuunp *cp,3yr1unep /0be:(iuat 3ra j*it,

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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 inducto5d *,hmfyou2g r are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the b f2m5goy,hud*attery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery ;1 bl4w2wbttqof constant terminal voltage. At the moment contact is made with the battery, the voltage acrosqtt2 w;14wlbbs 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 connect2,w *pwblrx lk/j sr9:ed to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectep0g z+42drhe et/v sf uw;j89xd 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. f*jb*lpnu np y49md-,The time constant for the cirf * mp dn-l*j94n,puybcuit 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 kkouv p/ug09 q(ckm49 to a battery. The battery is suddenly removed fr9quku cv m k9o0(pk/g4om 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 have0sfpt,d9u 0 n/uqi2pg 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 circui)l10pta: oob qt, 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. qeuezi7l5.z e/)o8qp In this circuit, the currenqu/ze z8eqie o.)p57lt

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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 chan0 +2 bqg :1getkygopy)ges by what factor when the frequent1g)key2o qgb+ 0yg: pcy is tripled?

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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 iyqt-76k*0 pws,ctwd q s doubled, the inductive reactance o pwq7kq6- ,cwdtt*s0yf 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 md*:t dv twhr ,/v*u+hk2ek7r voltage across an inductor approaches zero, the inducm krhvuvke,w dh2+*dtt:r7 */tive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. I5 l4 7z(bigz i/itg)1wfqt)w/hw m n2zn this circuit, the curre/n(bw hi7t )qgl i2f /1zi)4zzw g5twmnt

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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 by1 dl6kabb/6u oh1 7bcc what factor when the frequency is tripledc l6b6/ cbad 1b17uokh?

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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 zero, the can1), l waivvx1v5zny1 pacitive ry w5n l)nxiv,vz1a1v 1eactance 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 angrdk /cpf3 bsi5y40rri,ks: p/ph 5z2ele between the voltages of the inductor and capacitor in a RLC serid3zr/s r0r5s:epii /5k 4p ,c2ykfbp hes 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 circuit is defvp-obm );x buwp0x6+kined 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 increases if R increasjw2t;p 77 2 xy1wuqrq azt3.vqes. Wrv wp7utq.;2 2xy17q tw3zaj qhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit i h2pfsgt)q u4(ncreases 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 frg/,er n fl)49m)esa circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doublein wn i)gxjwpil)tej2f u(2 j/ s4)r95 in an LRC series circuit, the r )jeiw4jt)pi9l 2sxnu)i/f5wg2( njresonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is drive,.*rano:vkb ce gt iq3f.69vxn 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 series2(i.ycl2-l5.vtnayc z wk,vc(fei d; 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. dwxzi v1fjw i*1cy5-8vx8it( f7z c6d10 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 t d1v8jc6t5x*zwiz cyiffw 1( xd8v7-ihe 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 mz+ :fl s73p:y:l)*c dmtnyso 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the locn:)3spf l :*dysm:z+ym7tl oop 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 r26mpl fef8n 23le+hujadius 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 magnetic field vector are at an anglm jl ff+62elp2 une8h3e 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 a;lovx+z 7c:7np09ea8hi rxc: gzqc) hdjustable 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 chq 6rxjrn9mi49anges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. A,xnc v+m-+b+o.tls c g uniform magnetic field is applied perpendicn-cvx o .,sgb++cm l+tular 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 $emf$.

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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 /gibm4 w ynp6-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 andh-gyt7 d1c-wmazz12rpd9 wj7 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 aug8 e;yf4t :f/i ,oi(u b5o/oxe-eh ml location where the uy;:bte 8mofue/5/x(h liiooe f,-4 gdownward 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 is4j 2 ers-p1 .q-hsmxrt 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through on-h.q s t42rp-j1m sxere 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-secao1div 0sl5pj/ f0y cdu -4p/ctional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a0fu v hodw:(o:rea $0.090 \; m^{2}$ 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 ary d 5noon2i9m1e(skd m8yg8z.mature. 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 ofoy8 ei1koz 98 nd.s5y(2mgdnm 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 10gu1e zy v3-wji.r *8vg0 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 a8io rq82*1mjyw jg 5bx1tw4 ej simple AC generator with an output of 12 V maximum w2gw 4 bj1w5roqxi1mejt8y 8*jhen rotated at 60 Hz. A magnetic 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 with anq .u 5g69al cv:f u90tshuk1f 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 q ;he2cf-w)v gresistance 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 resistanc8uc95hu2o fd jdx33yye of 6.00 W. The motor operates on 120 V AC, and when runjf5 9udy2yc3 d3ox8huning 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.gd9xpy m,1, 38izdh*) v ij5ef7pmkxy0 W is connected to a 24-V power supply. The operating current is 1.gym zx,,1 i7mh kpj*deidvp y5f)x9830 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 ,dusgpm 2,xn .cv 1hdb)hg:6n24-V power supply. The operating current is 1.0 A at full speed. What is the back6)mhs v gn,b 1c2,:u.ghpxnd d $emf$ 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 a8(vk p9rb-; g1zd eof jz+x:ts 24-V power supply. The :zok 1 d9+sz8pf-(evtjxr b;goperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to red43swx6fg4bmdp y6 5 s;w8mn efuce 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 flo-hxakyig7j(,-u7 gb fw,w od d25br9 )qyzn)iw in the secondary. How mand9(kwb-u)h-,fgjrn77,)x y aiw oidq2b5 gzyy 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 ar ,ew00ss3de7sm 7bckqe necessary in a 110-V primary if the 24-V secondary h0qmd7sb e sewk3 c0,s7as 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 prijqfy5/ x+ cog+mary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primaog+5q/ jfy+ xcry?

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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 oim gm0+53tmv ygt gy+*f a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in thegm+t*ym v35t+ y mgg0i 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 10.0 mA. The ulvp jdzqmo 03 6m+w3 b7lnevec3/a; +primary coil opedlq76om lc3/n v0pam +e3e ubzv+w ;3jrates 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*.3uo tk5xhzfcpzgea :7 8l j*fa:vc+ coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to afj8cu: o gf*:a vzx*p5e3lkt.ch+7z the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer uf*tdr8 rh:s xl6b/8co,b v p(has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is prf6:v db xr/st*,b8rp cohl 8(uesent 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 has37uvgb,ti h.)gn mj q1q ovzvzy) 2)p9 200 turns. If thetg u 93v1nj2hvqgi qz )bzy,mvo.7)p) input 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 and its secondary has 200 turns. xkl /y w aj-bm869cxwdkhkrq75i4:0nIf the input voltage to the primary is 100 V, we can expect the output voltage of t ydik7cax-k984 k xq5w/hj6lbnw 0rm:he 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 turnw0tbq b+hrh: w al2t:2s. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictio0htr l2whwtbab+:: q2nal 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 cqfc4v f,tl7 in*q1 3xqurrent 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. Finlc4f qx7it1q n3* fq,vd 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 c znzn ohk)70rv.0o-uhurrent at 120 V. The voltage is usually stepped up to z kr )o7u.z-vonh0 0hn4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage : /go g5fcsw+gay/o np nn2(r0is 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 tn gnywc o:fr(+an s0p2g/5o/ gransmission 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 h wtnbtp(nj;)bfp f928dv,lr* as a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, t fvr j(fbnl9*dwtp; ,pb82)nthe 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 loclwjy x9-i+w6wz fxqe/.r6 p7 rg(l pven;25jng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission lnj pxerc wfwpy-ixej6w z./7g (+ql9 ;v6 l2r5ine, 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 af1t9bc gd*hccj8rq+r;hrave 4 5dm 67t 1000 V. How much less power would be lost if the power were transmitted at 3000 hb *c c q4v81t dghar;jc57fedm96 +rrV 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 atua1wtz g 3yj783i p9bp 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 withwyu j379p8tgzp13i ab 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 s:btdp /cdw )y8h ydz+:)qb7sttored in the coil's magnetic field/sy:t8t+)qwdb dcd:hb)7 zyp ?

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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 contain 7qcelj jo2:o/s a 6.0-W resistor and an 18-H inductor. What is this circuit's time qje/7cjool: 2 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 17vu ut4g tq*mAC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curreno6 /- dwkeiz/gk .2sy3o9w wl, k:xgqwt?

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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 out9ot ,q/jr)+vvs e;m jy:;lxoq let. What is the resistance of the laylt:vqq+) s r/;,j evo9mxjo; mp?

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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 wbo569 p4(keoyk: m hpac power supply. What is the peak currekmpp9e46h(:y kb 5owont through 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 cookyp6jh;3 s 5ennected to a 120-V ac power supply. What is the power dissipated in thpo j36kyeh ;s5e 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 resif qwpv jz *3(6l3:4t,l*y h7ebvcsmy vstor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor v:w tpnm s(:8dis $I = 0.80 \sin (240 t)$. 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 )m3 wyxwv6+unb,xntie a,(u 6resistor 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 1.0-mH inductor at)7t a+i 5rgnaaz9xdz d*cn+ c* 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 fd 4u7iw:nus +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 ind+mq z/.a:7ojy x *ieciuctive 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-qp ylltq06k 5 cxd pwo97e:7h inductive 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 ind0esqbq x8 kvl;uj7 +fa; 5f.gvuctor when 120 V AC at a frequency of 20 kHz is applied 0;a.fvgxq7u jlef8ksq;+ 5 bv 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 2.50-mH coil due to a 110-V, 60.0 Hzy. gvea*9m ,gmj2bkj- y-fg q, 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 ap+-l(9l s/qsi t b4jujpd5wq- 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 need,y(bkws+o b) jed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF caph:lx3m gn4c .3 ho5h gub-m8placitor have 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 of a 0.010-mcv 1o75tyt 68rfiqs j6F capacitor be 100 W56fs rqtyv786j cot 1i?

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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 o;jpu qeu.+b-a 0.0010-mF capacitor at 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 with 12.0 W resistance, 15.0 W gk/ dsqw).d h-1le kz*inductive reactance, and 10.0 W capacitive reactance?lkdk d/*z g ews.h)q-1

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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 coivl ;qehtmtx-696m6l,cz( 7 j uhrz7oxl, and 1.0-mF capacitor are connected in series? lvh6qo;jx 6z tl,e7(r79um-6m hx tzc

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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 y nm;dfazq() 5resistor, 20-mH coil, and 1.0-mF cnqay)5z fd(m; apacitor 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 ind8 3 9;,elna-a.yqdb2wiogvx zuctor, what is the imzb yal8;aig qe .2x-3,9wnd vopedance 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 connect0dyu d:/d zpn:ed in series with a 20-mH inductor, what is the pd uz:d/0dn:y phase 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 li.ao;fa4xa9p 1)my sz 7k/b iin a series circuit with a 20-mH coil and 1.0-mF capacitor for a ta ioib/)s4fyl1mx;.7 a kzpa 9otal 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 series with a 100-W resistor an:vl624*6(lce(0texg z 4mifuoqoovh d 15-mH coil to get a total impedance of 110 W(z:6umxi h ec4 2o04g olv* lqft6e(vo 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 450zw2- g(ugr z(, qpv*7ppx0edl-mH inductor at 5000 Hz for a total impg0upxp *g(plz7 w -zq,( verd2edance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in seriexkf- lf f3 7)0p+v;bcbjx+jlr s with a 100-kW resistor at 1.0-MHz for a total impedance of 150 l fkr c0v3fbp)jfj+lxx 7;+ b-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 impedl /0r z*k)dwlcancez r/ck0 *)dllw at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor atn.l80vq8hshn1. oerv 1.0 kHz for a total im0.8q .nhr1onvv 8lhe spedance 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 with0 9co2o ixl,fmmyl;s 1 a 10-mF capacitor at 1.0 kHz for a phase angle o o, c2 sym1xfo90ilm;lf $40^{\circ}$?

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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 ak xmif koq3--uj-x7rks 4siq 4ik0u:2 t 1.0 kHz for a total impedance:if-ks0 irqs4 iuxk-mox4kk 2-q37ju 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 themx3p98wdibk z , s12og phase angp wdoixs ,31 k8z9bmg2le?

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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 cozr. ghccg2eb)(* ;p/uipysa/ 2vet b*il, and 1.0-mF capacitor are connected in .)ps2 ;bg/z ir(a p/ucyvb*ct2e*hgeseries?

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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 9p.0u:m0 tkgbgrbii8of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power s.umib ti0rb g9k8p0g:upply. 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 ca9zy2m 7+jvx lxpacitive reactance 30 W, and an inductor of inductive reactancy+jz7 9xv2 xlme 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC cirtcmw 1z-ib3mr)rxqj+,8m 4qv cuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-x+-4 qj3mit,v1b r z8)rqcmwmH 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-Wjf j03va+aq46qz - qdu resistor for a phase angle of j0+6 a a4d-q 3jfqzvqu$40^{\circ}$ 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 ww.z5qy8tc a t2l ggp6q+gm) 4fhat frequency should the circuit be driven in4 )gg mtw25t y+pzqfg6ql8ac . order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac se ob8a3egzcyf009 uss geaklgl5 :b,+3ries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the cig f :ag5z0slyub,k sce03b 9+l ao83gercuit 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 anihytnm)y3 ow 3qlmb4 i*/h9 ;z 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 ieplyay,2gl;)vv- d4 a5oked ( mpedance of 60 W and a resistance of 30 W. What is the power dlo4 )y;aedvyk2e5(l p- gav,factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containip8poxip:hh 9 1ng a 50-W resistor, a 10-mF capacitor, axo1p9 h8p:ihpnd 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 frequenc lq/4bz0d3sdt7qh g7z*u qft3y of a 1.0-mF capacitor and a 15-mH coil in series?fu7 t qd4 hl73*3q/sz tbq0dzg

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant freqs8fop4c -g 2u wl/x0b0rvr7bhuency of 10 kHz?7obwlfv-0rhg0p8rs cb2xu 4/

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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-m9( . rcrs0fwo5j+9r q ) fnpnwqa.yc3eH inductor for a resonant frequenc +93ynj0ec raoq)f9qwr. c5np.r( fwsy 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 placed in series with a 30-W resixl9g ew:wkmh(9r )r-y.v8fi m stor and a 40-mH coil if the resonant frequency ovkr8gwx9eyil mm9w. f):rh- (f the circuit is to be 1000 Hz?

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