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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 flu 3xwwdq-o61wb x 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 inductinn0ae 8:nmur(w5a fv + yrzzn19,fi4 yon 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 ovrn:+xxd5 sz3o9 zt/uf wire in a coil produces what kind of change on the5z +s /n9zut3:xrvd xo induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetie:oc 3k oe/l8f(ktl96d-:5 pamgdzbic field through a loop of wire produces what kind of chang d65 f:-i8m:tk3goblc(ld e/o zae9 pke on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on thdb0 b p7./afuee induced 7ufd ab/.b p0e$emf$, 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 magnetic m/+ 9,y/aotkcoa dxb7q iee19field 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 )n.oecg/b :w/mm/o eh a conductor will be that which gne)//mhbo/. cw e m:otends 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 magnet is held above iton 8(7lh3h ,lrv vmr4us center with its north pole pointil m ronv( 8u74h,rl3hvng down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above+ snj(wo9kcap4z-f 9o its center with its no js(cf- 9pn9 4aoz+wkorth 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 table top f: u a0. 6gxf1r;:r xh(ttvgvfin a region where the magnetic field vector points straight up. The magnetic fivh( fr0x g1x :tr:.a fu;6ftvgeld vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a regionw0 ah6a)oh77;toknc -;t pkpf where the 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 this coilatwpn;6 p7 kk7ohft)0-; a hoc 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 d6* c79c 3bmva+,,mifaeauzaa horizontal table top in a region where the magnetic field points straight down. The magnetic field disappearsz76,+e39bda m,cavu*m acf a i 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 horizontal table and carries an ever-increa*5wxx/r9dla5kjk* up *lyva ,sing current northward. Two coils of wire lie flat on the ta u j*alr/p9 y*5dk,vk*5wl xxable, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north p rr+0iha5o o(b-iwqx /ole entering first. As the north pole enter(0i aw qr ih/x+ob5-ors 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 wire is rotated at constant angular speed abs29p) n1e xbqq;tw-xtout an axis whose directio2xp tetnw s;x19q b-q)n can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of 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 m+g.r:;n yqu1dzc+ mj axis whose di.z +cmr y+;qdn1ju gm:rection can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of 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.esls a .n(tj spxc:*/8
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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 tha),tn )qkhxcq1 t 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*(uo, 0vasm of 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 (oriented in the east-west direction) izih s0n1 cti8)wx3b(f 5dmj q1s moved northward at constant velocity through a magnetic field that points straight down. Makejx t3)z(h18b5sfc1m id n w0iq 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 angu r/pk5aeg m93gfmbm9/)do o0l lar 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 t 1c.b hncfn9m*-vrsuu8k3wb 4ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatesug0g)vyg2xb(fn w g800qc2k o through 60 revolutions each second. The frequency of the b( og 8q0vn)k0gxf0 ywguc 2g2$emf$ 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 n1r xozyt*5bd*wh+2t used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device that7ckuy-)aj7o, 6vkf y cy(kt1p

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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 cond (m)2*z,ug uvaw3xl vw/gb1c tains more loops than the primary coil tw*)lda/cvgx mu( v3bw ,2uz1 ghen 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 the primary coil contains more loops than the seco-) r lp+tgbvq-ndary coil thr)-bgt -+ lvqpen 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/azix;6pz;qvf ta a*l/74q im 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 cir,z4r5nxvi trv n ,vktp2 d9i1/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 series to an ideal battery) qvlan (/t z.fzn.jt/t0e5hp of constant terminal voltage. At the moment contact is 5q)ne/zt fltj ha/0v.zn. pt(made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to al8yym3 ;t-t-v of 32orcdr wegoj/x/4n ideal battery of constant terminal voltage. At the moment3yoxjw;ct gv mr4tr 2-8oyf- l3 o/d/e 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 connecat oemh0h(z: hg2(;k) ddkhx7ted 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 resi b,rwf-cg qmp8(ju7p*stance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected z;bppul( 5tg4(bbhj sq8ge5* in series to a battery. The time constant for the circuit represents the time required for tt8sg5*(eqz gu hj5 blp b;(bp4he 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 6n*:i, bovscqz9 zqj d. s8up7to a battery. The battery is suddenly rscbzqqj8n,.*o svdzpu i 76: 9emoved 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 following4paekke :kw;ip u(/ 7i 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 kk;8r er; e6rgs7gp b7AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to a 8po tc ,1nrt2eim4s8cn AC power supply. In this circuit, the curreni t8e2pstr,148occnmt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the freq p*vdgcn+0u .muency i*u +pgcm.0nd vs 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 acwd8i. aozrven5m 27z 85mg7deross an inductor is doubled, the inductive reac8 oirzvw5z8mn dm57e2a.dge7tance 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 AC voltage across an inductor approaches zero, tophedd of)-glw,) g 6 8pyj4i6he inductive reactance of th)g w6y-hde jd)f g486poolpi,at 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 comev;hif wli9:p qyz0k/ p:*1voln s +4nnected to an AC power supply. In this circuit, the current o v+l 9lkw;/i*s :1f0h:pvi yeznp4qm

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanzw-f ar xn.97lce in an ac circuit changes by what factor when the frequency is trn9x.f-w a zl7ripled?

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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,((mwplw v9y6myemp o28d6bp, the capacitive reactance of that capac6y2(lwmydov6p98 w mpp(b ,m eitor

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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* 1bl22 puycec between the voltages of the inductor and capacitor in a l2epucbc1y2 * RLC series 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 wp/5fz.f7zrrbhl kd/z, +pz-plc s9*an RLC circuit 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 increases if R increasfxxyo ( +geu.;ul+9 ;tr /eaeres. /ty9eru(e+xgarel x ;. ;+fuoWhen 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 increases if5e p c0 12kb :v*edpmgfypd1(u $X_L$ 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 the7s+ df m w1.yzqyn8php3q)8u( 09zmjj 4 yqnus 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 thelo76cd6a bxo1 capacitance both double in an LRC series circuit, the resonant frequency of that ci1xaco67db 6ol rcuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an A-0hs:f up b7lner1.r qC 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 circuit occurs 3z3 xu1 ahh3ekr zjf:,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 magnetic field oh v l 81fdrpkda.ca *yt78.xbrq(qm1* f 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magl78 .dcvq1pbr .a(xq1a8mt*d * h kryfnetic 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 m is rotating in a uniform magnetikkgkwcc8q:( 7 c field of 0.20 T. Find the magnetic flux through the loop whek(7k8:wgcqk cn 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.lw: *-imi)n t/wppsc+uib b7 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lcm:tw lb /i-b*sn+pwp .)i7u ioop 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 an adjustable single loop is re v cspc;n:t1*aduced 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 gj*k, 6xtr;sl: l1 hbzchanges 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 slkgkmkn*f18m750 k hvquare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plakh81fkmv l5mk 07 *gnkne 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 9wh ns/p(s) fxturns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ar2d,6z cf5hv 1n9ja+hki*(j3ld f dgfb ea $0.20 \; m^{2}$ 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 attvc:t xr njla -/*fe1hf*gj-9 a location where the downward comt*afn/ g:-x1e*rv9 -t jf hlcjponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velo+m n3 ko,flbi+city of 2.0 rad/s about a vertical axis through one of its ends whilk++o im3l,fnbe 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-s :cl- ld0bp+d(r, q mgwdy:-sgpt;l-nectional 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 + v*erw .mvs:l 9h3hacof 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 azl2 flx)in+ 1v6munc zqpw:i-2w 4tb *rmature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30- p cbn1zflw: n4z+w*6)q2vm xtiiu2l T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of jkd.nof*/ v-ar4zy(p51frd dwire 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 av+ps,m8a 2og u simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. s p+a2vomg8,u 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 mmo// -jl af) prulne2/aximum $emf$ 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 o q;tkbw8 3s-kef 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 3evpt1*p x: lu.ka x(rat,(mea resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generateu ,l* :x .pmt(tare(k31pevax s 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 concnm4ho-m/pgq ;r3 wh 1*n y*efnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current?enq-yp4 3f 1*;*rch/hmgo wm n

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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 interna;:goy 30jwtrx-tv d1p l resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is t: dor gw-xv1t0p3tj;yhe 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 4:yoogb o zd8)wsv(m 1to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bayw o81(4:zdsv )obo gmck $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a p jmpj/ oeh2qii(69 yfpp(-xm;rimary 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 transform3, mrh): zp,*hzcl5s rgj0sqier causes 14 A to flow in the secondary. How many turns are in the secondah,z3,ps sc 5ml 0rzrhijg:)*qry?

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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 primary5 dau r1;kn1ev if the 24-V secondary has 10uka;v nr 11de50 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consiiq)e4y0v6vhrj d, p k0sts of a 500-turn primary coil and a 2000-turn secondary coil.hqk 0i)dvpr 0ey,j6v4 If 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 pq )3 gc 3aeiyr qw*uf9(do/nh3rimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the(9)e3*fhq/u dcg3w oa nyrqi 3 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 nne/x al7xg0nu.lx3j 5. t l5y10.0 mA. The primary coil operates on 120 V.0x3j7u. /5x.x n5alegy lnt ln 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 i 4k6aedh,6 nmfts primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, 46nm6ehk af ,dwhat voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 30,j1 hde9nh :wg0 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondhw e:n9 gh1,jdary?

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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 tu*zk/9+doccj- nl 2binrns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect *-9zdjl no2nibck c+ /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 10hs1e cfdmr 9h05q.p n,cjvr2rn15ap+ 0 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output vofq1+ phercr.rna1h n,vpsc0dj m95 52ltage 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 secongdyrr.nof6m3*ur m )z 1-:wqk+ +ilr edary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglectinr rf)r l :di*z u k6+wqgm1m-y3n+.oerg 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 cugu65 8r*af6r o 9yy(s:emxzxr rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primax8 z5esf6y9urm rr6x *:y oag(ry has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stk, :,9l ritb9z0 fxe9 wm,kkmb ij,(vzepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost riiz9 9k,,k0 w(ktemvb: ,ml,fxzbj9in 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 volta9p85uvk cz /iuge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the per u8v/ u5pkczi9centage 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 resis gm(y7u yl60nytance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy w60( ygu 7nmylyould 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. Asxygpm ef(xej,+dm) 4()s a0o generator produces 100 V at 7)s( doe,g04 emp) fyxja(mxs+0 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How mu, .5oaln-b yizch less power would be lost if the power were transmitted at 3000 V instead of at 15 ,- nzioabyl.000 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+qq,7 z lcut(e to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a t 7lt ucqq(e,z+ransformer 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 qiuh5qc m;qma5h k8gd0 me77.rn(/+w hqj:v m5.0 A. How much energy is stored in the coil's ma;.(5q /ev57mmjd:8 irwnqhq 0hau hm+7gmckqgnetic 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 resistor and an 18-H inductor. What is th my;3p+t *0d rlwt+qi0pg7 lszis circuit's time consw;03 rm +p gil *qd+zpt70yslttant?

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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 volfcd .l:i94ccytage in an AC 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 plac5gshlq./9 +va:l nu rred into a 120-V AC outlet. What 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 intd9x yoh6p,ry3/b2 o,jg zax+vo a 120-V AC outlet. What is the resistance of the lamp?3xoh jr9b, yo,y6dz/2 xa+pgv

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peiq6yiyh* (t kdq4,qu-ak current through tq kiuyqh*qti46-dy,(he 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 connectedc 0noq)an4 :ac,,lznh8bti)i to a 120-V ac power supply. What is the power dissipated in thenn)cianoiz: ) h0b 4qca, 8tl, 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 resistor j(0,d(qrnx 39wwn izpis $I = 0.80 \sin (240 t)$. 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 is neasy zqf7c)2h14z gp l5gj)2$I = 0.80 \sin (240 t)$. 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 6 (iduzoxhi1p) qwe p tfc*t21u+;j;cresistor 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 indtyrv5h 51xe f;uctor 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 reactan1gcq lx8s, u-uce 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 in3znol 6zp, ,cr dfxu*6ductive 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 reacthgc*4d9qopave go )4z ,)zy:kance 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*i)2fptu-iyj la2ax 7 h) +zji-mH inductor when 120 V AC at a frequency of 20 kHz is applied ija- p +ha7i*jzfxu2t2)y)i lto 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 coilxon g 9z8s fav2q+f/ ;wv:x6xfc +u+ox 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 k+jjm p8j5:ltl Hz?

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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:*q aa jgj4j+ fwt(w-c of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor havq 0gjvwd lb:,*e 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-mF capacitor be aqcy(x+oo5r mm75 4 /h-(vuwelp7mz g100 W?l xuc 4p5q wa-/m o+horm(7gzey7m(5 v

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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 10;omn.4(k pfto+9eatmo oh7)3g *j6wrt pvda(00 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 resistancmk;6hfh: o ux 6da1xzbi 9ktb2pa36*ze, 15.0 W inductive reactankz1h; 2xfbhp3:6*tkoa966dbmuz xi a ce, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W rese8+ tl gxl- oqf)/bdi+istor, 20-mH coil, and 1.0-mF capacitor-ifo+ l8gtq/+ex b)dl are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-ml(f0. xdq,y2 x0(wuazlb ymcg lhxe,q+)ok+8 F capacitor are connected in qx ax .m+ch ,((xwk8+lu e),zfqg00b dllyoy2series?

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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 inductofn(rs;/m3 igmr, what is the impedance at nr/m;g(fm 3si 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 series with a 20-mH inductor, what s5cdcs7 9)i ux 8e+ymiis the phase angle at 1000 Hz?7mi8u xy5+seics)cd9

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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 7 kv/bgqx4qhja4,, .4ofmh lawith a 20-mH coil and 1.0-mF capacitor for aba4.q lo va4xkmh4 /,hg7 jq,f total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in 4w8 j6 *iadnyrseries with a 100-W resistor and 15-mH coil to get a total ija6yd*4i n r8wmpedance 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-ajwqbt/3 ; 6dy c.8.cts3tapdmH inductor at 5000 Hz for a total impedan3sa3p . /djt6w;.at cy cdtq8bce 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 bxml-luoli*nw 7.) aj8hk7o h.e put in series with a 100-kW resistor at 1.0-MHz for a total impedh li7jl. .uw -kn)ohom7la* x8ance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the impedzqs5 +qu8fle2+ibv76 s1nlebance at 10ullz + 86ss2 bf+q eib5ven1q700 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHzw5r1ygx;4d5 kf um 8px for a total impedance of 45 Wpy5x5x1mu 8; 4rwfdkg?

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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 au(n:d 18rojvxklgrtt 8 t3fi+c7*l -series with a 10-mF capacitor at 1.0 kHz for a phas3-r+uintvd:8 f8ac1l(xtrg l kt*j7o e angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz f8 g61gq0foino or a total impedance of 45 W? o i6f1gqg8n0o

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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 sh7l -5z( ctva comeo : y,n):y9a4f7odl4fdtq eries with a 100-mF capacitor at 120 Hz. What is the phase anzal hcm :4lff7q95a(v7do4,)ty-e:d t o cny ogle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0d9jxrptq:dq *ujmokl 188ay v/c5-b, -mF capa,dal q9rjty8ck /d-b:*uj8pmq ovx51 citor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consisthhko irq7*m3o pqt :w;1v2;u.ozhjo9 s of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powk qop7w jrh*1;zimoq ot3v9h.:u;2hoer 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 30 W4sdw 1*7)gk yo:rjm s0fbhjg 0dv zy-0, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flow0 r:jb0fm*whvk z)d yj 4gygs0 7-sod1s in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resist,d wexs-ha 03uor, a 10-mF capw,e0s3 ax-duh acitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in se3aix/og u5a4q ries with a 500-W resistor for a phase angle of 53o4au/a qxgi $40^{\circ}$ 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 ,5if whnnd6+s fj0fn4= 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tran4 0fn 6h,f5j if+sdnwnsferred 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 mn7k6sk lx405fm5zog0hb 8vq* tyuz-series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is coqkv0tflb4z u -0s8 g56mz*7nhxmoky5nnected 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 AC circuit ifrxw6 qn5 k:s0s $63^{\circ}$. 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 3n 1 xz7k,w06l hhxwnvh5mh2b60 W. What is the powehh2nw0m z7 16wxhl x,6 5hbknvr 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 circuitnx r9iot6tv *6 ;v7ddb containing a 50-W resistor, a 10-mF capacitor, an9xn;rbvdv t*ito6 7d 6d 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 o(p n 6hc2zqe 9ydimj:4f a 1.0-mF capacitor and a 15-mH coil in series? 9ze(2cn4q 6hijp :myd

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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 frkvdclvz26ry38 . lpb1u hy c;:6d5mwxequency of 10 kH b ; 1:pld6hvl26.dxuc 8cyz kwm53ryvz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductorvr f-m1q6*qa3- gek pt for a resonant frequenqame3tp1-q r6kv g f-*cy 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 resistor and 8*lpsh m w/y ems.c-)kh.fwp,a 40-mH coil if the resonant frequency of the ci.e8hhmk wpm *syf-sl. w /,cp)rcuit is to be 1000 Hz?

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