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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    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. try 5-9hzr7fiai fh//hz-rh 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 a5vcgds+ vm/xb+ 4q) pstates 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 8sgy1* ;n63mxcf ogo gt4fs2 fwire in a coil produces what kind of change on the indu2 6g os3fxgfy;nto*c1sfm4g 8ced $emf$, 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 f,p3z* d ht 1zp)c6y myjehwzm)5 u*+oproduces what kind of chan*jw z+zh) *tf m1)mep,dz3oh6ycy up5 ge 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 ,2sn oujb)6wuthe induswnju ,ou) 26bced $emf$, 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 fro;9wkr6 2::opus fho jjm a 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 current in a conductor wsj;t, q-o y9hakm6na8ill be that which tends to produce which of the following effeokhn a8;- a ,j6tmyqs9cts?

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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 horizo xy :6alrw3jvg8d4rx3iwo+q:o n ::eyntal table. A bar magnet is held above its center with its north pole pointing down. The statiorxo:j3w:ld 4w vn:3 y+iya68rqxe: g onary 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 btw05c tx :v hr5d1) s1:i1c0urgvrwyi co/m,on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and releas dvstcm,5r t0:wgr)xcy wo1v1 b5iu0i 1h/:c red. 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 tablez:n -zxpz(0x rr i3ya+ 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 zy - n(3xiparrzz+x0: 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 regih3kzzf6tn8k8 ) :w v.vvj n8pgon where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induc8:ft86 z8n znk)vwgv hpkvj3. ed 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 3fwf 1ha sb+8ya horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suabsywff81+ h3ddenly. 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 tabl9v.t6)ro)l.ej zst s d-f(gh1hrx.jie and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one o tijetf ..ox1vr(d6h9ls z -)ghjsr.)n 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 entering vu:xy 4f /c subsc,(1 d.ijf7ffirst. As the sffvu:xf41y(7jbc u/i d ,s.cnorth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed ab+aoh wc i(b(+*lq 7:j.s(uamccqz2y eout 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 l+ (c. (*yi2 woabcq+u(se:amcjqz7 h 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 a xtr -vxde3wir5j a264xis whose direc3-ajx6 e rtv2xiw45drtion 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.)s.i9 :r dv9s/kjcubq
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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 mx1uprv kh)ik:/(x; f an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Th n6m6,qk a/a8;fyryo fe $emf$ 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 theo day2a) xu;m587bibw east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pob;a udxw528ab)miy7 o tential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocitas4o4t dxt.8f y $\omega$ 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 th;.dw 0m k0xa 7hfdmnu9f+r c.ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency z;fm6l917iyphe1h 6 itfp+rw w08bqs of the 18 6qwt9zefiiwh701y; blhsm6+frpp$emf$ 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 tm 5.7xkj fr7 fh2h1dwbo

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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 u tdt+5iw/p9cya+0mdbq0dh8* m.ell 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,:qfy8m7kc-v tm:+ d)m fpsk/x or6 gs than the primary coil then it k/g+) mt,:vo8c7dyxm f6rkmspq:f-s 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 coi 5n 4t.sxahwe) -z,dxnl contains more loops than the secondary coil then itds,a4 w .5hxz-t) xnne 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 poy,b70;:+tte qh svmafwer 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 circuq,2vl5/qz fmp 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 series to an id7 jsqby85zo;plji3 b3eal battery of constant terminal voltage. At the moment contact is made with the batteryj 5 pyszbbloqji783 3;, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery o5m+. ;jkrtutxo; .u fcf constant terminal voltage. At the moment contact is made wi tx+jrkf.u;.5t; omuc th 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 inductanceja w7+5 qxbyy2gj am3, L and resistance 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 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 resissacub; mp .1t05*kfdjtance 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 co hrauvc e:qfib2(,c5) nnected in series to a battery. The time constant for the circuit represents the time required for the current teuq: rficcb,a (5hv)2 o 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 induc5*et. l-dkq bzn,r9klhj86 1vft:dgz tor are connected in series to a battery. The battery is suddenly removed from the circuit. l1gj6ebkq:9 5rlk.z-vd, nhtdzf8*tThe time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sa fmo 4.v6+2xoq of+ su73cttlpme 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 A0ojf5rkm9-n hpj(/ gb 1f;ni aC 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 tok 4i2l(n3afi c:g pwt. an AC power supply. In this circuit, the current4 il. t2fwi gkpc(an:3

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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 faccjlw) c9zi 010hd6hi itor when the frequency is triple0hhz i9lc )j1iiw6d0cd?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor ifi7onr/l ny ,) s:5jwxnih.g7s doubled, the inductive reactann7: nlw s/ io7. jixr5hg),yfnce 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 acrci31pl y krz:9u etf/w: yr- hg g4:/y02uiapproaches zero, the inductive0g2y-p:i/ahyz cel9 uf43 1 rw:i / g:ryrckut reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to 0i+spl4dk b5z an AC power supply. In this circuit, the curre +k4d0 ilsp5zbnt

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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 circu bzqrrit.z):w.+,69ac1 t nlo6iohp x it changes by what factor when the frequency is t)6+:ztrxa.q pboci o,rih96 t .1ln wzripled?

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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 approacto;w)q ;-kqv w chh8i0hes zero, the capacitive reactance of t i;0kt q w)qowc8v-h;hhat 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 andf*ga8g;jl;rj. s c; zd capacitor in a RLC seric z g8r;dj;;.gls*f ajes 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 denqnp6mq,auk+ )5 +2 (3zigt4cn r apxypc9)h lfined 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 impedancer0p+81qii w7i:3lb qogw pbk; of the circuit increases if R increases. Whewlri8p17+pb3ogi;q 0qw :ikbn 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 o)/0 ofn tkyqziqm8 nf u1e5:m4f the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the xozmyl; s +zi +-f/(ztcircuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, t:mboiy wfe- bi /bd85)he resonant frequency of that bde y bbw8i/ moif5):-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 resonan;3:y:qtvy lnvce,

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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 w e c nu)vjl-.f0ta7s8RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic ksxu8+r y0z9 lfield of 0.20 T. Find 9s+k8l0ryxz uthe magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform ma kpvmuyrv*g)*) y4 vi) *nlw+egnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo +* yr)ylvk*vn *we)puv)g im4p and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifk 1tnd1k2 q-dj,vc jaod2ym i(7e4-cgorm magnetic field of 0.20 T. Find the magnetic flux through the loojdgecit(24,-yk - aoqvk1 7dn 1jd2m cp when the plane of the loop 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 l w )+5w-deavbeh;/ghan adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changesv,l se:w6jssi0 lqcs 1f44kp+ 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 si(:f,ou8 ugn5 xyhhljgo ,o/f8 des 18 cm. A uniform magnetic field is applied perpendiculargf oh5,8hf:u / 8yox(gojn ,lu 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 *6(vgsv 6r f)utfo4 a6qqhne3 with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns 5bpf/gzx 7j6kd1noe1 and area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where th*5 xeyd a)oj gxf+y:*mp55fw ee downward component of dxx)5:5+*ejmfoaw ye fp y5*gthe 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 consta+mtwf3 -w ;cb-thf ji6nt angular velocity of 2.0 rad/s about a vertical axis through one of itsf-+b3tw ;i6- jcmwtfh 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 +lon)60xtgxnpjkps.8 / 6 0ycp43fl8sw qstl area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area4xd*jwl s +1ex $0.090 \; m^{2}$ 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 u ) (/(bvp)dede3ctd; dyik3w 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 fiebypucvwd)) dik et 33e;d((/dld of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns ox vvifvwea y5*dai w19:w:00of 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 wisha-ecyk 6h 33tk*3mf ( qpte8niqoz. f3 to construct a simple AC generator with an output of 12 V maximum when rotated ah 6pf3kaiot q(k3 *3m-cyzne 38t fe.qt 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wqicoqpaw1 4dre 9 6q(+ith 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 -h uqc1i s;;jp. tmqr8dry52v motor 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 resi zlt;,is fasb-5lix) u k:8fk7stance of 6.00 W. The motor operates on 120 V AC, and when runni7b lkalfs)iu-x;fs58z t,ik: ng at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suprmz* ( o0j 3uzsm a*jvua2(em,ply. The operating current is 1.0 * var uzza,2s((m3u* jemj0moA. 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 cviys88ymt6z (onnected to a 24-V power supply. The operating current is 1.0 8sy(y8mv 6 ztiA 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 resistan: zq6we;my*:wwo r wzgentf2 20/ z8lvce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bacw 6 mlwo; wt*zve/0zfyw n:reg2z2: 8qk $emf$ 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 primary voltage o/ j3wk ltn(zb19q;chd.a (ae2(bgc vdf $120 \; V$ 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 ool(9zjax+ o;h f a transformer causes 14 A to flow in the secondary.ho;ja x(+z 9lo How 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 the q(w rlo3r 4o+g7ohu,jhml5s 024-V secondary has 100 turns?7 h+ruq4olo3gwmhs ol 0j(,r 5

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary coi oix9;qj.silim+i5 :b l. If the current in b5 .i;x m +iil9q:jsoithe 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 trar(r ue0f.t sx6nsformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seco sxrrt 60uef.(ndary?

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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 qnx9b b b(a*(u10.0 mA. The primary coil operates on 120 V. What does the prima 9uxn (bqb(*bary 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 tuf.*,3;5h pn7mpn 8w ykqs puexrns on its secondary coil. If 120 V at 2.0 A is applied to the pq3ex,5y 8pup nsh;kp* m.w nf7rimary, 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 . -myx/; 7 ta uvhxdierm*6.fpits secondary coil.vm i 7 e.;xudy/afm.6pxrh-*t If 120 V at 2.0 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 transform 4+,qm hrn-daoer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currenta ho-,qn +4drm at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 4h6z*dg zdl 6zzkw1x)t.ys8jturns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sdzsw l6tzxh) zy186* gk. 4jdzecondary 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 transforkexp 8y /isc8px52 h+bmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can ehcebk2/px8 +i spxy 85xpect 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 n)a(j 5(oihakg4;wwr120 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 primary hasa;ion wj4) ka(5g(rh w 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 currtg1l4+ 8 u,pfhlq k;gv8; yzdruz em.2ent 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 t;qur81 geh+ 4l z,zt2v.8yudk;lp mfghe 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 gks/+-) it0 q8gqh 1iv murp( nmtc5f8.wy7atV. The voltage is usually stepped up to 4500 V by a transformer angiq)cf1y8g-8m v7+t thauqkm. s(wi/r 5p0ntd transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60dou ak;z/4 9u6lfeje) W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltal/oe4d;k9 auuj )efz6ge is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has .5p35( ythjlp 6v.9c6swbg dktg1 svv a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce eg5 vsv3dt 6v kb(g.p9 lwt.p651 chsjynergy 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 10e+ satz2j, nww+3 *ueo00 V. How much less power would be lost if the power were te +e *,a2w3nts ou+wzjransmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generatorup,p8 23ernem;a jml0 hwi0(g is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generatora w;er02ppm,83ejh 0(gu iml n 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. Hoeh 77r,i*ulcdw much energy is stored in the coil's mlh7 7*, eucidragnetic 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 conta8+p+5s rvc gqihbcq9 .ins a 6.0-W resistor and an 18-H inductor. What is this circuit's timeqbq p 8s5rcc.hgi+v+ 9 constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms vovvc wa93wh( tqgk3 bsh4o+,, ultage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak current-lkvk3w9nt8b x0yqusb, v 80t?

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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 place4oyb cyblj5(j5)x x 3p-7m /pmxg x81n ltdi5gd into a 120-V AC outlet. What is the resistance of the lam5j dg1tgx5x/3bm p8 b)nxmji5c7(-oyx4lyp lp?

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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. ri7o 0sclax,2kij + nga03sn0What is the peak current through the rnli7sjik sn r+ao,00c02 ax3 gesistor?

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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 uhmy 5 wg(70 +(ssbvelubosc;y 5v08b supply. What is the power dissipated in the reso;(e g0uu7b bclbwvy0mv5y h58s+(ssistor?

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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 resisth7* yu71bgouw0 p sun op(w(m)or 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 jy 10bmo.,2 mcf-rzbna 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 56hr:x4se c/ ye0-W resistor 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 inip-lg. 4gr p -p4d3l5w r4uphfductor 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 ,hod q:onnq;1 ,y /pozreactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reacta ,r:*q0ygnerck +p,np-/ju esnce?

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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 induct8 *eentzfr 3up rg1(cfu/ 6/gyive 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 Ay6geuqfordiz;+xw br +,e 30) C at a frequency of 20 kHz is applied to ,yx 6 ;ug3 ++zo)bwrdqefe0ir it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due 4dt3w jh6(iu71v ymw8nd ow 2xpl.6ctto 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 ek87/wmaf( ;l,ou8efsq 9x gs-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 hyr- n7(f,t bz. 8vy8eoh hz1mp7nwlc+ave 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 d-mw yon* l6hvki+n))have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF bex/s e4e 846t)vf5hqh+pfm g capacitor be 100 W+gs) 8t ff4/h e45mvh6eep bqx?

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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 lr y 3, jja9(yh7xla*ski-ch,o+xo*e1000 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 ao1b+fzx /nzu:+b rs2in ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 Wir xzo ++b/:1bn uzs2f 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 resistor, 20-mH coi:85e,zp+*gkdj unc oal, and 1.0-mF capacitp u+gcdej,*k5nz : 8oaor 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, vc+umwa p cdyz.3h7k6x3 p w/620-mH coil, and 1.0-mF capacitor are connected in series?+ 6wk3yhawvpuc3./cpdm z x 76

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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 wiccsj-mu* */ a4m; lmpdth a 20-mH inductor, what is the impedance u *m*jcmdm4a; c/p l-sat 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 com:-xg*t ,rsn 7qgb.ztnnected in series with a 20-mH inductor, what is the pq,m-g nz.ts 7rxg:t*bhase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit wi/skp3l r,ppb e1.:fl cth a 20-mH coil and 1.0-mF capacitor f:3p/k1 lp,cers. bfplor 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 ugk61khq / mbgou, n)lz7) .koa 100-W resistor and 15-mH coil to get a total imp,6.ggbqo l/7n)k k kuzh o)1umedance 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 ;gmt 3 gwj1cr0g y5s2yft/ .twseries with a 450-mH inductor at 5000 Hz for a total impedance of0 2g wjg3 15mytctt./s;wf ryg 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz fpd 5(b(+wgt lmai)j b(or a to)lt wm5bgj(+ ((bd piatal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series w1. epl6t,wyb rf5x ik:ith a 20-mF capacitor. What is the impedanc1:5b , fwy6eil .kpxrte at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in seqlk /mc9 k+ymlniqj 06 **uc96at3et gries with a 10-mF capacitor at 1.0 kHz for a total impeda k6g9ctnyl 6/kc3 e atjquliq+*mm*09nce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with /gy 6s/f imn0ga 10-mF capacitor at 1.0 kHz for a phase angleg0 ngi/s/m6f y 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 resistorl kpyg*oob) xxx a4b2+0z. (((djrbhn at 1.0 kHz for a total impedance of 45 b)(( grb2j 0(oy*ox4xd l z.h+kpa xbnW?

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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 10b;d wgr j-otzo4*pk4v6yjy3;0-mF capacitor at 120 Hz. What is the phawopk;ygbvo 4ryj6; t-4zj 3*dse angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 17htyywykk4p 1j9 ge)tyt3.-8 x a)wiy.0-mF capacitor are connected in ser ig4y9 .xt7y-)1 ywtj8yt p)hay 3kewkies?

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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 a8b.vvy8mk b 1fd20fnconsists 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 power sundv 2y .0bkv88bffm1apply. 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 +cs9rd2m0rcddy;9be capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in serd;edsrcb 0 r9ydcm+ 92ies 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 an+ yu72m5gcp hge fyz96upac;6gle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductorp2 e yumcc 6p796gu+a;fh5gzy, 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 resisto,gk2s ezs)sj:h ll1(h r for a phase angle of s s2jh k)ll(egs:z, 1h$40^{\circ}$ 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 w-5a3mcc f( 8svi; gtyfhat frequency should the circuit be driven in ort -m5 is f(y3cv;afc8gder to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circu7ri8//lj h,t2yzp2pw h/ kxhyit with 12.0 W resistance, 15.0 W inductive rejht yrl//p/kx,pz2wh27 8yihactance, 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 f2fqm x6arr; *4t.fvyl ub)l1AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedanc(63)ox5cxq v nx 6pgoqe of 60 W and a resistance of 30 W. What is the power( v x35go6c6xoxpqn)q 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 containing a 50-W resistb2xw4n fcgr) vnh1 9l:or, a 10-mF capacito:fr)wcn2v4x g9 lnbh 1r, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency sm9(-t 7ohjryoas mry 4z4 /k2of a 1.0-mF capacitor and a 15-mH coil in series? s 2y k/r94mjt-hr7(aomyo4s z

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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 hrm)*tan5n/ua+t( pkfor a resonant frequency of +m(pu5/t nna t)*rkh a10 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 resonantl )w6rc01.f;ylcl jqpdvk43gp5rmt tc 4 9rx0 frequency plv ry5ft4 xgl 9r )0m.tc0p6w4cqkd;lj1c3rof 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 resismm7yci )yy1 a.tor and a 40-mH coil if the resonant frequency of ti 1c7my )y.mayhe circuit is to be 1000 Hz?

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