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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 magntr2b 87c fo(w p//wndpetic 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 induvl-e :hvb. q tyou9a47irr.)ct.d (qection states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil prbo td0+1wk7b;-m2cawpos 8 d3 1t jgkeoduces what kind of change on the induca +ot 1josw37wb2 mcdk8;tgke1bpd 0 -ed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire pr4 7 8edat) ra)toj7g)cc.hv qvoduces what kind of change on the ina a)v .rh8ct 4get7)o7jvq)c dduced $emf$, 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 chank *n-z ro47w6j nqim cbyv:l+:ge on the inducen: q76+wj4oni-c*zr kl:v ybmd $emf$, 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 fieldbpi b+ 31h1ozgi7 yo uma;j+j. 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 direct5(.;qurvybf aion of an induced current in a conductor will be that which tends to produce which ofb;r 5y(.a qufv 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 ug;vd agug7kxr,eh;( 5p3; w:qwnfwkr 1 -5ppis held above its center with its north pole pointing down. The stationary magnet ind:ppww3 vkpdu(gh 5g1awg,5 ;;qek;xurn 7r -fuces (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 uj5qsbbqz :99 table. A bar magnet is held above its center with its north pole pointing down, and releaub 9zqsbj9:q5 sed. 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 in1mvv * vz87tuzrk 2c50g (jmxt 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 field fades? 5mtt( cu08rvjv*2m17v gkz zx

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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 o1*::3weexvp2so;x o +mwygw magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is :wooy3e*2evx+wmxo 1ws; p :g 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 top6 ns1;6csw/kjwa zd x* 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 currjzwdx 1s;/ wnskca*66ent 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 lievv/2gmn fvyjil. e)u-/l5g: qs on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire-jvuq2y/vevm.fig:l/g ln 5 ). 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 l roz.h y8 nzmd8 mnp/d)l*,zt.oop of wire with the north pole entering first. As the north pole enters the dzp8y.n ld )*8m om.h,/ztnzr 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 wirf dv4vqpw-yw e9nonn 7 ;b84n9e is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the in 9v4qwd9nef wn48v yobpnn -7;duced $emf$ 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+e.n3ev , bpgy an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the i,enb+vge.py 3 nduced $emf$ 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.:k:yy+)vgv.kkqpf u1
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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 an2+yu,z q8zkrehj)(rw b(9qwa $emf$ 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. nd(yq o am(4d(*lg)kw 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 northward a3 9j6 iglz;t mr1ls6kdt constant velocity through a imt3jklrl z6s1d ;6g9magnetic 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 rotates at a constq m1m)ekl7 i+q yu1hm9ant 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 transfoc( 4rahpi cm/1;)tsshrms

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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 secn*ksdt 1g *hqbz ;ss7.ond. The frequency of thebd*kzs .qnt *;s1sh7 g $emf$ 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 usbf:jdf:r( z8r5wa;0j us3 v yted 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 devicb:oz op (1*jpiw o9)3 vrisk0ae 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 than the p42hs/h3szs fd 6 urk0drimary coil then 2ss04kd3s hdz 6urf/ hit 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 naca(u 4bwof x0h 6:l3primary coil contains more loops than the secondary coil then iuba4x(0a6f:n w3chl ot 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 q5j rc5yi28s uinput

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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 circu5 e1((brggkx o6y+uivju /yn :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 inductor are connected in serp 8d-w) rssqoue/q5iv.oh)4p ies to an ideal battery of constant terminao84r/sp o)d- e. sqh 5u)vpqwil voltage. At the moment contact is 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 connectewh9(nrzxq1zem4 k5wm-3 k* +wf8nv y zd in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage 483kyf5 qmv*e(w z9nx+zmh-1rzkw w nacross 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 connectedv7m 6y:3df +qr z x*ekef7,enf 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 conj54qxa8 injotxrcu9-7 i2cj )nected 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 connf top:(e yf9c8ected in series to a battery. The time constant for the circuit rp :t(fc yeo89fepresents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batt7 wbkf;)8gx ssery. The battery is suddenly removed from the circuit. The time bg7 )sk; wx8fsconstant 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 h52 zb5okc k a5byim;n7wyz* h:ave 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 circuit, the c hebwzm6q15-vr/rxzx,c9w3f urrent

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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, the curr9 x 0gi30mtp b5fk dt,)9ghi/jvggye; en0 gmt9xigj 3v/g,g y 50hk);eb9fpidtt

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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 cioux qguwbi,, p01to6y2 b/ fb1rcuit changes by what factor when the frequency is triyt 2p 61xu ,,ioo ubg1/bwqf0bpled?

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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+anx.e iq otp7z*:edx gdjssb/-- w,1 across an inductor is doubled, the inductive dig ssa 7 j.o-ewxz x,+*tp/ :nbedq-1reactance 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 v h,9m5.g bcweuoltage across an inductor approaches zero, the inductive reactam u5.cw ,he9gbnce 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. In this circuit, the 4.jvdfztwwrn ;* (3*x 5srajucurrentjnwsfz xj(*vr;4*w35 .uda rt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when w;do)57o ( bz6g2x tk+qtwt uithe frequency is tr;gt)2 ozqwduw+5 tkix6 ob7( tipled?

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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:be xqex vapf-ifnb ,pc7z10j1(e*4u zero, the capacitive reactance of that capacf xnjei0fxpacu*b(7, - 41: pe vzeq1bitor

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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 theni il av2z3s ;6q44wu+b -ixlu voltages of the inductor and capacitor in a RLC seri-4s426i;+ zunxiv lqi uba l3wes 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 dblm7 2ycwaa j nr8q*m3b8);mo efined 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 j)jyrcmo-c)e4 t9; qfof the circuit increases if R increases. When is this statement treo-j t)f;cqr j)9mc4yue?

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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 inccb 3b: cpv3p)dreases 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 increaseu/0e p(ptj45j; jjvp e9jex t2s 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 double in an LRC seriesjk: v q3o*+pv*cahx1x circuit, the resonant frequency of thaqajhkv*:o1x + * vpxc3t 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 driven by an AC applied voltage. At resonance,nf+g0;g)f;0g jf b-mbrx 7za c

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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 occukbhyk-*27 z yurs 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 uniforf.u1a-ai yq(c e* ht:gqjcg2k26y2 tdm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plg yjg .tdfk*cc (1-thuaqy2 e6i:q22 aane 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 0.10 m is rotating in a unifod)xr3ll+mq pj + :b.csrm magnetic field of 0.20 T. Find the magnetic flux thro rlm)+. dsbjlq :pc+x3ugh the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rfa+brv9wef j2u9)/l motating 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 angle w2 f+l)er/v9majb9fu 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 reduced from ig1i/2 ry/c:v8l0jevm)d q oz $1.0 \; m^{2}$ 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 ch9ug2ng -dcy/ mlwv 3.langes 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.i5k+zpy r gt6vjx ;89v A uniform magnetic field is applied perpendicular to the plane of the coil. If the field iy+x5 j vt9;z8prg 6kvchanges 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 turns and anp2+ :xj1hu smr 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 anz)f)bht ynj)fk 7c8*d d 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 tym*6ajnp6-eh7 u b:1yv v3qb60 m flies horizontally at a location where the downward component of 36m vpb6nh uatq1y:ybv j-e 7*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.g w*lx2 x0:c kkh m5z9dzndo0.0 m long rotates at a constant angular velocity of 2.0 rad/s n k2c od.lx9*mz0 zxg:wkh50dabout a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area o +kqx/egwt2+7/biw cuf $0.25 \; m^{2}$. 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 xe*94n28a s jb7cqotqwire 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 rectangulwpw(tm+(-kmgh(r l l :ar loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular t pr:t w (k(l-(+hgmmlwo 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 o4;ns/ ljcvr es:n6(hbf 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 generis,v;l)mq.uy q 3b+ ;jann3t8-lejowator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is a m,sqtnyiv.3;+aojlq n8 blj-;)uw3e vailable. 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 maximumy+hvwlo v;15pm kv.z) $emf$ 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 motf)1swqvoq q )d8rv6r9 -37jrek bqi89pj d:lw or have a resistance 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 resisv-6fnt +syk3q3 8s d*(mdiomxtance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generatesm+m3( sxny3 *osq- vidf d6k8t 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 connected to a 24-V power supply/n6 ty9bu- a3yfelo6s . The operating current is 1.0 A. Whln/etsu9y3ya-of6 6 bat is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Tx2e lx)xe3us, he operating3xxu e2e)lx ,s current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resista4 g17 v3t5g2eeozbj t:ggnvo:nce 6.0 W is connected to a 24-V power supply. The operating current is 1.0jt2ng4g o:ve 3ze1ovt gb g5:7 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 7q8 2.g8qn;quwdgmtd needed 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 prhuzou1u7 *k+m9jrs vxu 75z u;imary of a transformer causes 14 A to flow in the secondary. How many turns are in the sec1s77 j r+uuvmh zu;uz9xk* u5oondary?

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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 primar:rcqw w*pv f.5y if the 24-V secondary has 100 tq:vcwf*r5 wp .urns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consis43+3jka vg6ce0hmks) (hep( 2wkmoq mts of a 500-turn primary coil and a 2000-turn secondary coil. If the curre0 o4ev(mk3c j+ms3(6w)m 2gephkaqh knt 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 traf-m1v 4e.,f1 eijpbs7ilf q.znsformer. Assuming 100% efficiency, howj-qf1f1 vm.ep i s,4z7ilb.fe many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.lr ip,,in y9(q0 mA. The primary coil operq ,inl,( 9priyates 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 trcxu4e (r/(mci;/n xprimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is ancu r /t;(i(x4/xremc pplied to 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 has 60 turns on its primary coil and 300 turns on its secon3w bf54gqy 5hodary coil. If 120 V at 2.f yowhb5435qg0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its s/e bfuy(gc2y: econdary has 200 turns. If the input current at the primary is 10u2(c:gbef y /y0 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 secondarj.sg+eb lo)9dtd+m ,mmx2vf:y has 200 turns. If the input voltage to the primary is 100 V, we can eo.jt gd)m+blsmv: +e, md92xfxpect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 t58g; i (rilfjrurns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power ou8gfri rj i5l(;tput of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curre e hhfpjue5/-4nt 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 uej/p 4-e5fhh 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 u7 ju63)wr i kplv6v7kvoltage is usually stepped up to 4ljuwvpukrv7 67ik3 )6500 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 curv.ow9ye:d*pexx 9 8zv rent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line ife.zo*9 y9ed8xvxw:vp 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 acircx +ij41n a;*gr+line 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What pera*icgxar+1r4;ji c+ n centage 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 Wf9zm ;2* qs3znt,o8h*ccnu zy. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating2uc*; cz3t*8nfmz9n,h zqyo s of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power g) )2(u7ugzi s mp qbu24wja8twould be lost if the power were transmitted at 3000 V instead of7zgugsb 2p ut8w ) 4ijqau2)m( 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 .*wf+3 eqc tdwg6hy*iA. It is to be transmitted on a line witg w qi3we.+ydt*f 6ch*h resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the 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 m-clq0: su5 urduch energy is stored in the coil's magnetic fieq0u5-dsclu :r ld?

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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 18s,pp7vfucnx u* dm(3y r p9xlba7 797t-H inductor. What is this circuit's time constam77, (rt9pubp ad 3xp97*7xulfs cynvnt?

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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 voltagh4q 37kqw5fmxtli9( n, dbxv, e 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 120h2 uq/:0a udvv,+cs t (npn-wc-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 into a 120k1g97v, fgnma+jj,qn-V AC outlet. What is the resistance of the lamp+q,mj g7fn 1k,ngv ja9?

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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 c9;z9bicz nju- -io :wthe peak current; 9zn -uzbcw9-jcoii: 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 connected t t p7efn79t;n vd,qis+o a 120-V ac power supply. What is the power dissipated in the resistvft7d9teqpn ; 7,in+s or?

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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 resistjio j ,u8y53h.,ua6n c3aw/zqe 2 mewsor 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 t2an3 + pyld*gis $I = 0.80 \sin (240 t)$. 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 resistoi*h1z n9ui/g tp- 2rger 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 reactancei+dr/7lsu:x )al-o l /o ldt7e0xm9z h of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of j2tendnnr 5i ).v r3/ea 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-mH0pv+c 1 y 4x:xv9eh ga;oln+nr+la,ni coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 a7ejco05t*vx yahi5 v 7 4*nnnHz?

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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 7zewn v0x2ccx09 .lmq(y q i/s60-mH inductor when 120 V AC at a frequency of 20 kHz is applied to 2xls.cn y(9vi zwex7qq0c/ m0 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 f 8j1dc j+5i;x:jrcbs2.50-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 c5, ie.w(7xxft toye;4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of))b8e)dc o krd 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 have avq2+ g:l -m3al.4*ega wd nobte 1/nug 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 capacsg7( 39y 1nfof.dx.tofk: olritive reactance of a 0.010-mF capacitor be 100 W?:n k1of 7lyrs g3xdt.9fof.( o

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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 0d)dh 2fu6:- x1qil wic.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 vt;d /+piy-uxac series circuit with 12.0 W resistance, 15.0 W indu;+vp/dy-tx i uctive reactance, 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 ressgnrn:8)w 3pjg p7 )ptistor, 20-mH coil, and 1.0-mF capacin)7js: ppt8gwn3 rgp) tor 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 hrp4 g4u4c7suuex-x hhe v()ipb*j*31.0-mF capacitor ar) 34vbx*(er uihsgp4x7 e -j4up*hhcue 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 co,y /, fj.wby+xlz xpt6nnected in series with a 20-mH inductor, what is the impedancetbwz,lyp /,6+xj x f.y 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 conihtx9.; +k jyi pr;m5.m;gap5j.a gbonected in series with a 20-mH inductor, what is the phaseigjj;.;aroy gab9i5khp .;5xm pmt.+ 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 6rhm)a-5q udc(l)qtcwith a 20-mH coil and 1.0-mF capac- raqt u5)6h(ccl mqd)itor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor anq xk3,f5sw+ev.5,,akzo bym,a,oa gxd 15-mH coil to get a total imp xx5 kf,eyavgka5,obzo ,. qm a,+,3wsedance 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 id2: e4;3 kqa(1 yrueitsof5dm n series with a 450-mH inductor at 5000 Hz for a total impedamey (ds2i1 5o:4qaft 3 ;erudknce 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 ivu -rq1v5p5due s i*+hn series with a 100-kW resistor at 1.0-MHz for a total impeda ev5pv5hu- r1uid+q*s nce 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 impexbw)5( es 9m4pztkyeq :a / -fva9uv8t2 iq(wfdance at 1000 Hz? v/atvqwf(xbe ku9)f t8 ez9as5-mpw: 2 y(4iq

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neede6l0meun7d9uu- n o+gco(v5urd in series with a 10-mF capacitor at 1.0 kHz for a total impedance +no 6gmu -uo5r(nclv9 u due70of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-d50 7za b r9.qlcqwe6e:9yb simF capacitor at 1.0 kHz for a phase ang5q9az 9e 7: diql rcby60b.wsele 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 f:z.ji/ 8m, xnohzz+ldor a total impedance of 45 W?xz d,:+z hoilnm/.z8j

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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 Hb3j we0s:8lrnc 5yao8; nq l8iz. What is the phase acqibn580lse3 a8 or;w 8l:yjnngle?

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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 rei(r+ :/1u tfsqa;7c b2ihggd,z c1nsssistor, 20-mH coil, and 1.0-mF capacitor are connhsa1;, t rf1+:ug /z2qn(cc7igsbidsected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, / ky;*ui,tn:paowp c 5b),fxcand a 0.350-H inductor. The circui5cn* tf,xc;wu:p abo i/yp ),kt is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductek0xl7iwii ct9y-ol k/ ti**0or of in tk*ko 0wil*yxii0-9ce/7 iltductive 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 for a seri 9b7iize8mkk+ rk f3h:es RLC circuit containing a 50-W resistor, a 10-mF capacitor, and3 mfebzkhir7:k8k+ i9 a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resi sc kcfobh +s k0whu8r4o76 9k7f/wj)wstor for a phase angle ofub kw0fsr)fh/s8 46j+w c79o h7wko ck $40^{\circ}$ 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 what frequa8wwum/g2mkqlj 2r,3h. x v3h ci)0mjency should the circuit be driven in order to have maximum po3rhml80kvij /2a umj, )m .c xh2w3gwqwer 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 acql e2x (yedg)- series circuit with 12.0 W resistance, 15.0 W ine-(2ledyx)qg ductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cirr(lv ya35bk *zcuit 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 impedanc*f i+-oy2r ) gywqik)qe of 60 W and a resistance of 30 W. What is th o2)w *q+giiqy -k)yfre power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containi nat7cy :;de d2d/l3.2 4uvaf zlvk+abng a 50-W resistor, a 10-mF capacitor, and a 0.45-H 2atylvd.+lc2b dkdu7 aaz 4/: 3fenv;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 +dmkb7yq nc iw+*5d*zy of a 1.0-mF capacitor and a 15-mH coil in series?57kiwdzc yq*+ m+n*db

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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 fre240xq6 cortjj quency of 10 kHz?q20rj c4 6oxtj

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a iq.pyo4 8kq ;jlwobb l-ny.d9xz )-c:resonant frequency of 10 ;4wc l:8oqld9kjb-nbiyop ..z-yxq) 00 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 pla9xwdcd:0hxn 7 ced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of th wd d:0n9xxh7ce circuit is to be 1000 Hz?

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