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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 okvam1( ujkzpn,3w6 wj :uvf6 2f magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that the.x,drf -e g+du.n tot+ $emf$ 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 changv9aa cwdfze t7o9f./2e on the induce2aa t9 zc9w/dof7.f ved $emf$, 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 protr , sdd:8,wxoduces what kind of change on the indu 8 d:dwsto,,rxced $emf$, 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 the induy.o3i blrr d/)cebd 3.rlri)y/ od $emf$, 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 a276h0d9p h4w5h;tia a fniwph magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced cur kw:;-m rhi3xlc3s 881ysons nrent in a conductor will be that which tends to produce which of the following so8km rnsxn; ic:3w -y1sh l83effects?

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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 -:r-pssa +wmphorizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (whe a:-p s-+pmwsrn 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 h)nj s -5ph:2 +lz-0gr/ hnytrckoxa7 9jrjt,qeld above its center with its north pole pointing down, and released. As ih-y:rr chk) zlq9r,sp0/jjt x2ta gn5-n7oj+t 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 tabxb6 -/yo o lwpkcs1/,ble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?w-p/ b6oc1klsb/ox ,y

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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 af,- nnjb+bu b) level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly gfbbn bn+)u-,j rows 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 hor*wkux rt3u/.9u ; jwn3 0mlugxizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currlm; 3wkwtn 0u u3x jgx9u.u*/rent 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 ta;itek32bwby1c zi8/* 3 kdsi w3l 5jbpble and carries an ever-increasing current northward. Two coils of wire lie f*jk531tyi 3 3 z;/2 bskbw8ici pbwedllat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enterialk1ze q*9r f*t 8ay7dng first. As the north pole entelzd8*1aetfrqy97 *a krs 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 conse8/ax*c w v d(qu*soo,tant angular speed about an axis whose direction can be* wsqv* ueo(adx,c/o8 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 idiag6:cv 3 0vjnhr:f ky w5gex:3um:g:y5,k 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 rotatj30 :vh 5nxf:y3v ygui,argi:d5c: 6:wgm kekion 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.au:ah1crxo,qf( l +p6
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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 a99 jcdl;e4cjj65cfw en $emf$ 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. Theq(5+ 3wlk ixwd $emf$ 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 at conyinhq*wy 7+, zstant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rn7z,+*hy yqiw od.

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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 consta :483q b qj1a6+hslf,iuaj+uswibx 9w nt 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 generato, t; 5qdoobir9zk*3yny/ p.bpr transforms

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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 revolutionssn5)b;y:gb 3 1iyyga f+oicy0 each second. The frequency of t yyayb:i5gi;g oby cs31)+f 0nhe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used * :0ufs-m0 sy-p ok x9ykpm:qdto

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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 r9njz1d, +kt d wh7o6zthat

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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 ;l*+t: uqn-m lfy1y fxthan the primary coil then lnyf m+ ;*xfl:yt1uq-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 t(1y g wkf)0*qo2lisqvhe primary coil contains more loops than the secondary coil thew*iqfos(0gq v l)y 1k2n 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 inp2xxf/a a: )utpyt eg09ut

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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 resonafk93gzapj5t5 oi2/ur,7mvy bnt circuit,

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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 bat81/1yw ljxonv.60i v qil arb0tery of constant terminal voltage. At the moment coa 0nv6y l.xwir v/1108li jqbontact 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 arl33dutfy o1y +e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with 3+ytd 1f u3ylothe battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to zu z 1g:srpp337fk1zam;wzl +wy:z.yan $emf$. 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 resis 8fbtx)m rxjzj/8:4sktance 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 in series to a battery. The time c3taot g9ofyz,x 6f7ys ;+: mkxonstant for the circuit represents the time required for the cur tfy; fs+, 7toaxm93kgz :6yxorent 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 ser8 a w5 wi6kcdi q0)y;2a4ymadries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time redyr )ykc waqadwi80i; m5a24 6quired for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have tl cq4 :)e/zbtdb/ uf(rhe 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 thisjbl- 9wpfd 16h 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 an AC power st2 dl aer , -9rwabqmj5mvy6/bf;4w78ws w0t vupply. In this circuit, the curren,72ld wfs v0bma-;r5 wr4t 6y 9maj/8qvbew twt

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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 wf3p5/c/hjj4h n s g,t1sbvgj; hen the frequency is tripl/tjs5bf ,nsj41j vhp g/gh; c3ed?

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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 voltag,g++ dvyyfw2y2xo +d de across an inductor is doubled, the inductive reactance of thatyg2++ddyxwo 2+v,yd f 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 aklt29mtt z( w5a. heiv.w 85xapproaches zero, the inductive r2wvi(twatlxt 5.85e m9h.akz eactance 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 ci s c8dvbus2 a07j,zl-qrcuit, the currebszjsuaqv0cl,2 d 7-8nt

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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 th/caoj 77h o+imjf) o9ve frequejfi7o9 oo v)c/hj+m a7ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, thehnse 8 nad719iwd ;n*n capacitivenned;s9 nnh8i17*d wa reactance 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 angle between the voltages of the inductor and capa .i rq4uyoa,:scitor in a RLC series circuia i 4r,q.yus:ot?

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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 soa xb3p 4lt,9RLC 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 qby7xa nz:c0sv( o5,f R increases. When is this statq f(n5cy oxv7z,s a:b0ement 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 c mzo;e n63p+j sals(*lircuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circrgn q77+ 3 rsuqs.zwj.s r0*oj)/v tbzuit. 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 cqmta -8t m90ths f,2(all wqb8apacitance both double in an LRC series circuit, the resonant frequency of that cir -t029,tqmfl8mhqb al8 (stawcuit 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 drj*5u b 6mk251vsc rfu7s6 hsh2bfqq(riven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit oc zpx+f-zcl;sgp4aeq qqx/: );curs 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 t7euw arty).7mb 3hz3;1wyf nis rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the )y1n f7tw3a7;hwu 3zbtrem.yloop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotat eqx6md.+wyf27 1,f n0zcx4rix wc9ebing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whmy x6zcw 097q.bdxf2f4nw1er ,i+ cexen 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 ja q/ 4+iumjb+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 magnj+4 u+aim jq/betic 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 adtb 4kt ujjod3:, v26r s7kdnb)justable 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 chub/ ; 6oixblfw4k( *hjanges 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 20z2.wpe zgqny (k*bs 9cihl (mg5q478:6bsijw 0 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendic.zbyhzegwkjm q ( ng2lw*ss975q p:4c(bi8 i6ular 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 turns and an arep2kj0ittdy0 6r *-uv+zv qb y0a 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 9yup(thjo- e 9area $0.20 \; m^{2}$ 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 hl9n-bv 18b9af8 hbvuph3(o b of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field uh(f9 bhp31 la9n8 8vboh b-vbis $6.0 \times 10^{-5} \; T$. 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 at80q yyr6nn/7yapj wdvup-8f uwb4x78 a constant angular velocity of 2.0 rad/s about a verti rufy wa848jyp y07v/x-puwq n8ndb67cal 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 57sy( k.zq,r ,bh8o a licr5h2k0 loops and a cross-sectional 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 wiry:e l6:gwg)9w8.f;lj.umqcvo m c2e behv)p .e 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 4thm/-wz.feb 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 to the axis of rotation, what will be the maximum output voltage of zem/w -th4b.fthis 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 wire of area /awbf c)vzgao 3ubq. 9sc29p8$0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outp+d;u ,uvtnqt dlf o+8li0r2z)ut of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the alrnof8 , dtu;izd0l2vqt +u+)rea 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 wit po1e h.1kscee0a8uo)g3,bv ch a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opq w85-stf h )(4e caxmqme,bl/erates 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 resistance of 6.00 W. The motor operac i .iyu.n(od6gg6u9 rtes on 120 V AC, and when running at full speed it generatesy6g g.ioc(r9ud. 6ni u 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 supy 7--xpohv8teply. The operating current is 1.tph 8x-vo- 7ye0 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 ntovh5plb i)l) n.au(o+ 8- uyconnected to a 24-V power supply. The operating current is 1nn pyao+-b8i5uholu(l .)t v ).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 r4smh+1p k9f qvesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full +q9p vmf1s 4khspeed. 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 nee (5zb h*rh+( -ri doe9gmoo, jwbxe09gded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary olwsft /zufrb34r;vh8 m0 6a0vf a transformer causes 14 A to flow in the secondary. H3lf;whr60t v4va sf0 m8zurb /ow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if thh5f9 , ojq4pxa( gm-*srcou l2e 24-V secondary has 100 turnsg5pxrf2ushl jc4q*9- a,o om (?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000 3p2oj sj1k.8d bj+4w9hh nsvflit)2u-turn secondary coil. If the current in the secondary is 3.0 h vbij 4s2t1j. 9kjf) us l8doh2+wnp3A, 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 2 vrhxxi 3 :3o;zvm5)jj it/mia transformer. Assuming 100% efficiency, how many amps at 24 V can ;i32 xxhjivmv:j)trz53o /mi 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 l3xia6;fmn 0ffb- zgq,di/ u; 7500 V at 10.0 mA. The prifb/a0i zlm fx;qd;-gu ,nf 3i6mary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 t edise ,e2b+s)q7c/ tqurns on its secondary css/eqec)2 ,q +ibdt e7oil. If 120 V at 2.0 A is applied 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 )zj .yey ,z/ykits primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appliedyze/y. ,)yzk j 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 k, +7: ipxa:sx6m il4ioedfqu (s,de(secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currenfxe i47iemd(uxd,, a qkip(: 6+los:st 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 nj8(ht/el us5(7nf e( *otkdu200 turns. If the input voltage to the primary is 100 V, we can expect the outpuljt58(( usde o(u 7 eft*n/hnkt voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turna /nbpps3fh5dd( ,;cfs. If the power input to the ph5cd3f;pnsbdfp / a,( rimary is 100 W, we can expect the power output 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 current at 120 V.p.ei rk;uq15j 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 ou5rjq; ek1i. pf 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 voltage is usually,qq iy oxwn ,:w(8vuu6 stepped up to 4500 V by a transformer and transmitted through a power line of total resistanvnw 8yo:qxq(iw,6u,uce 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 p(y+u wpykdrl91my ; :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 if the voltage is np 1lduy;p9w(: mkr+ yyot 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 resistance2 .p-kxs,5bsmya vcdrp4+8p2rjn 7na 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 would be lost if th8jrb5m2+- npkxvpac2sp4 ,nsy.7dr ae 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 7p;3 tkh .tvls50 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 he hltk3pt7s.; vating 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 linb36uv 7ytmh cy*lrc8 5e at 1000 V. How much less power would be lost if the power were transmitted at 3000 V iuryc5v8b763 lch t m*ynstead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is toiu/z;cn,dku+a i6nr) be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the poku rnzi+dn;u) ,/i6acwer 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 curren93,ipk2 kr6kx / 8blqex0fqw nt of 5.0 A. How much energy is stored in the coilr86qknbi0 23 fekl ,xq9pw/xk's magnetic 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 resisqurj,n s, 8l/sfv32z*h v-vxktor and an 18-H inductor. What is this circuit's time constantxhlqv3fku ,/vn, * -2rjsz8 sv?

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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 Agbm0k86) a4cnpmtt h ,C 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. Whap-8g t0 ,dmckmt is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance o pn.xg mkc72e7f the lam 72e7c gpxkm.np?

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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 powuo zfrsmru .86cv6h 41er supply. What is the peak current througc ou. mrv66h8fzru1s4 h the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. 3en j.fj .iff s :idb;vjxkvw1q96:7f What is the power dissiv:6idnfsqkw j.f e3j;i7j v9:fbxf1 .pated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resag,a 2 wvj-cnfao 721bistor 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 resiszdx 5ttq3inz d:*r2 ;ztor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resik,1 zfs5lf)d4 vq6tt ostor 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 q8w4e) qw xdw4of 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 a 2.50-mH k(zihpea(); ka o r.n4coil 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 j6.n;)6n ogje4nj kkkW 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 inducti ul 08p0j h.7ciso/enlve 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 inductor when 120 V AC atbb8mtiq/y 2y(odbi;ioa b18 8 a frequency of 20 kHz is appl8bbi(ob ;8q2iodtia/ b 8yy1mied 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 throumq qdij*j .8ze*9fv2o gh a 2.50-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 reactk8y+ikwfbe9 6ance of a 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 havezx+7c gi7 4k ketlns6u42n)a l 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 capacitor havpxlef u7+n:7 ne 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 gx u)kna :)rk*1(whmx0.010-mF capacitor be 100 W? 1 r* xgnx)kmakh:u)(w

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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 capacitoo q 11vsuw3st76a phsii-f**i2pqai*r 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 circui l2 i2fq5qag63f*ey -jddcb8gt with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivlb2*df2dg6qqa y3icg -ej f58e 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 1500n5ur) q3n1bn d Hz if a 100-W resistor, 20-mH coil, and 1.0-bdnn5 n)1qru 3mF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if anp2 wm4r 9a +z;n+g/xr(fy89lt pwbwo 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriptp+x( fanmnr w g2 owr89;+4/wybz9les?

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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 se- m3gyo(smcbx e4; z,pries with a 20-mH inductor, what is the impedance at 1000 H;, -s(eygm4zmbcpx3 o z?

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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 ia k.zr ,ywk-(4g bcz6ns*fx *zn series with a 20-mH inductor, what is the phase anglzs*yz. c6an,gkrxk4 -wz b*( fe at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with anln,t 8 )upj2x 20-mH coil and 1.0-mF capacitor for a total impedpnx tln), u28jance 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 kortye69 m aii1ns* ((100-W resistor and 15-mH coil t sr6my(a knt( e9io*1io get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for aq6f bpbyraljz xih897s6 -p, 5 total impedance of 40ls ayj6p 5,p 79zh8-rb 6iqxbf000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-M(wdg+ yzxe7s(yx,hj/i a9 g+xHz for a total impedance of 150 hw/ ,aj(eyxx97s dg yg x+(+zikW?

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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 im.0wnu6o jar9me;/(wx ebgv) g pedance at 1000 Hz?bro.)(xu;g/gwan w 0m e96 evj

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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 kHz for a tbc7j( y(rs*fga3w+v l otal impedance of 45 3+7varylgjwb cf(s( * W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a pi5lz9sjcseq(diff3* f/dq 4v:g so 4 ,hase angle ocsi3(soq*4 sd5jiffl :z9 /v4 ,gfdqef $40^{\circ}$?

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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 fo)- rzgq roit(ia i*qg4lc) 24ir a total impedag*) 2c-iq4 qrtz4)i lig aor(ince 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 thex64gyqx, s i,/6t/zo j fgmj(8 q,jgcg phase a// yj6tsgjxjf o,g,qgxc4 6 (mgi,8qzngle?

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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 Hxm ot .qx1+fw(z if a 100-W resistor, 20-mH coil, and 1.0-mxq tof(+.x mw1F capacitor 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 consists of a 100-W resistor, a 10.0-mF capadi k p0c*jcq/zxd0j, 0citor, and a 0.350-H inductor. The circuit isk cz id*xqcd/jp, 00j0 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 capaocn23 tl y6h8vcitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in shync3 8t lv2o6eries 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 seo3 ym)y f0-hwhries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz p w ho3fym0)hy-ower 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 necest.jtv;mtqjd0 ,oi (fru,6t0 qsary in series with a 500-W resistor for a phase angle off. qtt,6,ti ;dmo j0(tv0rjqu $40^{\circ}$ 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 =2h ikt0utmr )+ 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from thet0 u+mhitrk)2 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 e( -v/bs/e:avjl6tul ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V /uve/6v- a (ls:j letbpower 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 circuitg.rhg35o5c+9oudi u v is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What is5jdw(k oc- ls z-m6j7n the power fajdo 5 6lwk-z7j-smn(cctor?

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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 amgrj ,sy6z( 4 7ep4nyq series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po6,y(s4y4jpezqr7m n gwer supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capa7 h+ qjsmo9p.ucitor and a 15-mH coil in series?j 9h7o.q +smup

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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 caa h9b e, *kql91ndnmycdo3+i(pacitor for a resonant freque9b9dqoyncm 3h *(nd ki a+e1,lncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a f+ b+(5id4srkcibwrn. *k7x1 b:tygcresonant frequenn :dbwrxi(7 f rc4 +1ciy*kk +g.b5tsbcy 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 serl.amg:0s 9r ( cc0xtfries with a 30-W resistor and a 40-mH coil if the resonant frequency of the cf lt0gr cs.9:(mcar0 xircuit is to be 1000 Hz?

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