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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exceptta9c)tj0 ld4xn,i ye,

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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 state(q)-1znfwg j vri a;b+s 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 loopsik1f7.gwe2m g of wire in a coil produces what kind of change on the indumi.f2keg 1g 7wced $emf$, 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 producdzn6w hi62g7 mes what kind of change on the7i26 gnd 6whmz 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 lme lx-:5a*het;z f weur/d:4nhc -if(oop of wire produces what kind of change on the induced hdei/;f u:xlfaz-ch :r( n* we 54t-em$emf$, 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 fie 2ck ng8aqut0tvcm.h/qc k/-5ld 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 directio2cej+ cop0 fuw6;;als fkf8s7n of an induced current in a conductor will be that which tends to produce which of the follo 7ffeco20a+ jfs skp;w6c;ul8wing 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 tablearypp:6 t**fj. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (whe * pa*ty:6pfjrn 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 ijsd57 .:1gskygn h 8dfs held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed d 5: ygkhg.817jssnfd 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 z q fqe;zd.tnfntm++p p/,9lt v 9ou/(table top in a region where the magnetic field vector points straight up. The magnetic field t(, / e +z/fdpq o;+fvnpz9 qmtl.9tunvanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top e/ t8vpmzrwy:t6zb7z:qx2a2 lr56 ct in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current i r72:pl vyw6 zr:bt ctx52e/6tmq8 azzn 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 top in a region where the magnet8 6kq 8ij2nbtbic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced6kbi n288bqjt 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 hori*mfe,dd 0x41 i 9dixbhzontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, thb i9x,dif1d04ex *dh me 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 w ;f:j (8lfp2nwdxij9yire with the north pole entering first. As the north pole enters the wire, the induced current will be (as vi ;i89yd p(xffw:njjl 2ewed 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 rot 1 k4h9ia,hu9 if27wibqfdp2 vated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight difwbahiv,2h27p1iud 9k 4f9qown, 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 axis:sjwg .i- g )v4xstit5 iql)0n whose direction can be varied. In a region where a uniform magnetic field points straight down)xs0iiijtlnwq -g 4g). v 5t:s, 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.u +*3zt zo :nmtdkx5m2
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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 qov4 db42q8unk(, twqan $emf$ 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 m cznxgcg8. kp85 0:i 7plaocm0uu5(opagnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in thdib-- iba3leoc: *(eaa )r9wte east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the r3i-d w bb:acaa*i-e o9()eltrod.

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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 d +ynj43 3iej mg)6qekangular 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 trane-7pt8h:ct ;il(mj.8mxeomx sforms

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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 frequencuf x-:pr k,orj 54l)pqy of tp q5j4ror pl,ku) xf:-he $emf$ 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 devicefo*jx6:k/d 1bze4a ez used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device that+1 g4p/rh 90ooepnyi z

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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 thagdj4yq wxfrc35c5fm96 0/eii n the primary coil the50xr fg /f dcy65mc4eqi3i9wj n 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 th(aky; rc)m3y9 /u -xt-fmmjuee primary coil contains more loops than the secondary coil then itfxrye/t)3ka m jmu9cy u;m--( 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 inpp+ +rp vvsjjq;n7x5r f2g r;(jut

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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 ip 2rxv1iql4-g22n,v *hvoi k 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 seria9hp e0hz /oeems+v 04ob)9rqes to an ideal battery of constant terminal voltage. At the moment co 0 oe0eh99zo4/sebpah+r) qm vntact 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 connected in series to an ideal e .6w7 ern*;5jlaxg2z(d q -uztpud1w battery of constant luuej.; a g*75e- z(px6nq2ddwtz wr1 terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an ad* uks0zmruq ml) 1 +g:/ ;.sh9qyapo$emf$. 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 resistanv .5wp4uaot-; dalsk, 7o 9,c x.xpbaice 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 i0yr:y9/cn cr battery. The time constant for the circuit represents thicr:0yyc rn9 /e 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 connectep-9 ee/hz7 phfd in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for zh-p79e fh/pe 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 same units exceptt3dw7n o( 9sbo:

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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 y7-hwsegpu b*sah.5 0supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power s wt;cto/y9 ptrp0d7+pn q(t8hupply. In this circuit, the currentc/ ttrpp9p h8wt ;0q( d+ny7ot

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the fv.;, w,rr7fwclrn ,n e3agaz-- s aw9brequenb,- - s.9z7cfwanw,re3;n a wva ,glrrcy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an indvy -64z4 ;dct j7a erxkt7-, lsfgfei.qnb,z3uctor is doubled, the inductive reactance of tha nz z--qy 7js4a ,vt,ce76lb eix.f3 d4;kfgtrt inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zopn5- pbvtw+6gjl,(xero, the inductive reactancevp,oj b( -t5g+6nx lpw 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 thufm h6n2 3a(kfis circuit, the currennh fmfu3ak 6(2t

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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 i74w :pv;i :4of-uv+l4t kzoop s3ruh when the frequency u4i fvuth4owr kszo+vip 7 o :-;:l43pis 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;5ry:jf5rzc, d hdlh7 AC voltage across a capacitor approaches zero, the capacitive re 5rcrf7 hdh, dlzyj:;5actance 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,dyy l)fw s44d capacitor in a RLC series circud ysl4,dfy)w 4it?

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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 circ)f alwj 6kcy+bhq.s1x xiz7/lk* ;8ypuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increadt98n oc *sng 8fg.t3nses. When is this s tnon*c3dfg8 8tsgn 9.tatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit in jj)d,y/ q9ibi w/+t +:lzsxftcreases 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 impedance0w 2ax(x:prb 8zgc.ed of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doub5 k r,15dbqdf9sbsz2nle in an LRC series circuit, the resonant freqnrzs51d9 5,dbsf2b kquency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by a0dxx jq8k uj4-k m:0cfn 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 cirn m.8 d66t phzobm )a;bg sg5xhf,5a+ocuit 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 atv 6)ais6pai*q8za-vg-/j jp) wwmk , uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the,w-t wps)vaki- a86 zm)/avjqip 6* jg 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 magnetic field of 0.) eryep qc-3u720 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectorry)e 3-qc7pue 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 9g d;:fxqx crioq4;lme9o-8d.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through th rd l-e;x8f;d q49i :xm9coogqe loop 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 an adjustable single2*upow s6w* py 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 changes fru b su5e*8ayf7aswjn ,(: q4from $4.0 \times 10^{-5} \; Wb$ 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 turnqgyn: a.u,bq,s of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average vqy a ,q.:gu,bnalue 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 az:)8vnpw gxnhg 20s*wnd an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area ku8 al yirffg(o804 p-z48xvxtix 58j$0.20 \; m^{2}$ 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/gotlqit(0cn fxf21 /fk h 0cy9((hsr of 60 m flies horizontally at a location where the downward component of the Earth's magnetih nf9gy01/h2q(c( f0irfs/tkcx ol (tc 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 rotatesce596 vqp:n kd at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constantnp k 96vcd5eq: 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 cr,n p;m8brhmw 5 a7iq7xoss-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 wire of are4ciuz 6-. 4y3tv w2.tifjobncaf*5 k ja $0.090 \; m^{2}$ 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 armature. Each dh 4 bp0-pfo )9jysf(3;+exab bfzvv9loop 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 perpendiculara9+ f3 h04o; v( -bxpv)p fydbsjfezb9 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 tr dmsb*)abl3yip2 ( s; pgl:)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 gene2vlrn 0m9:ncxrator with an output of 12 V maximummv:0x9rc n2l n when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a mje 5-j0:1z vz3edsove z1b-h uaximum $emf$ 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 moffcwucu/9 p-;wic0a ( tor 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 mo oqz2t;+ .6g5:)xngoyl+, liyzr wx mdtor have a resistance of 6.00 W. The motor operates on 1205+)g ,x y;zo yoigwqlm2 rd6n:t+.zxl V AC, and when running 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 conneowbx1 n 55ky 37ubra1wocf.w9cted to a 24-V power supply. The operating current is 1.0 A. What is the start-up 1k7.ow x5o3nbaw9wbyr 5uf 1ccurrent?

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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 connemo01d s*kw d4,ex.mrn cted to a 24-V power supply. The operating current is 1.0 A at full w,e0 ks *1drn4mx .dmospeed. 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 resistance 6.08nx ifnjr698v m4w)n/d/ osk*ku,gp sx * rn.u W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whvr9xn8p )m/d4ksjiwf,kxuur /6nn 8*s .* gnoat is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to rexx bo:w( hilk159.bjcduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes z5ellefs p :g6h9f z0614 A to flow in the secondary. How many lez 6p:g h9z6s0eff5lturns 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 primaru/ 26jwfr18y ( bxjolgy if the 24-V secondary h/6x(jro18bjlg w2 ufy as 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500- j7l r/-mhq-y0nd )rmkturn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the pq - km-mj)d/yrhrnl 07rimary?

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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 transformer. Assuming 100% efficien gdk0/xys*j0z:- b)th; iwtr jcy, how many amps at 24 V can flow in the se xizb)s00;kr :h-w* /tg tjjdycondary?

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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 s-,* d45 djkssi- rflscign transformer provides 7500 V at 10.0 mA. The primary cosl-kfs d-5,ds *j4c riil 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 turns onw ,-q,xy rv-tj8vx*h b82zabm its secondary coil. If 120 V at 2.0 A is applied xytwqrjx,,zv-bv-hm8b*8 2a 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 tur bk8bqru5id 7xyt ),7dns on its primary coil and 300 turns on its secondary coil. If 120 5dkqr u,77id)bybx8tV 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 transformer has 100 turns and its secondary has 200 turndz/8vt 3ny6e cs. If the input current at the primary is 100 A, we can expect the output curreny86ct n/dv z3et 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 turnn;u4w n )j67rubwayk 2 .ojnli1 2spt2s. If the input voltage to the primary is 100 V, we can expect the output voltage of the seculirpun1 j)sw4y2.6 7;oat 2nbnj2 kwondary 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 tu)3)0jy9 hqpy , mt4 c 1bbpve/bxw4dmtrns and its secondary has 200 turns. If the power inj3 pv bh0t ,)t mpq/14)cmbxey4yw bd9put to the primary 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 9wl3 22bxpn1y 8hzjp /n*lz-wb*y g buat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turljn/bwulp ghz 2bb18y*9np2z*3- xy w ns 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.j,i gfg m,1g,c/ xu k+sh2gqd; The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 g+k ,s1 ;cq j,xh,iug2 mfgd/gW. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u:y.hn 6dzgbf; p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage hd zy6f b;n:.gpower 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 hasmjqqxyc2x,8 ul7g i+ 1 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 percentagij8l,qx+2 mcuyg7q1 xe 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 0.60w .f6)bx 3 47p;o;nqxcbzk pko W. A generator produces 100 V at 7oz.7)6x k c4bwp;3xb ;qfopnk0 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitte.gr.yk b12 jgld down a 6-W line at 1000 V. How much less power would be lost if the power were translgbk..y21g j rmitted 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 genera vds0)x/x 4/yosqjcv*tor 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 generator output be sx/0*x/cs)s jy vqo dv4tepped 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 much energy nuyts/ftd.:/08vp kv dpu (3wis stored in the coil's/d 8vfyv. t03u /npk(d:twpus 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 resistor and an 18-H inductor. Whndsr5/ 8tl p;dat is this circuit's ti5pdt;n r /d8slme 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 whe uwmin6:2ejiw5 jg1 4kre 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 w6x6hl7ict 1c 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 120-V p r ;xowuopk00rp c-(6AC outlet. What is the resistance of the lamp xo u ;o6pk0cp0r(-wrp?

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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 /t6otie4z4*egqc9xz a 120-V ac power supply. What is the peak current through the resistor/e94t4o qcei6zt*xg z?

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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. Wha*n dje60bwmt3lqb1 k.t is the power dissipated in the reqk03emnlt16 *d.b jbwsistor?

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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 resisto,vo fca6fga2:r 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 resistorquu8l 9; lvrrj uln9,*7wwc2h 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 resistor r kibn;ek5o4f/0 zwj /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- 0mpzgs. gaugk(h, p81mH 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 coil at blsfn*+ho( 8 i1000 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 c,:tyl fcht:( ooil 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 ba 7y(hp(l.r /mic uf;fd/t7 cHz?

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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 sjxwrj+ c du+zh(:l6(inductor when 120 V AC at a frequency of 20 kHz is appls:z rwjd+lu+6( (cjx hied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.g) 7jqhkfax zm(4;nj+ 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 4.7-mFk0e ;aut:;dxi*r h q*. upg 6upb0:uok 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 nrrp7lie.1i)fd 7kzb8 ux3 ae(eeded to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor xml+8 m4 6zlw,meo cwg/.pa;i 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 capacitor be 100 W6ygq9ai/2e al/z y t2eaa2 y/ /i ezg2t6q9ely?

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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 1000ir )o siveyg0-a.,.un Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resjr m b k9g2rip.ro1y80istance, 15.0 W inductive reactance, and 10.0 W capa8.y1prbkjg 2m 0ri 9orcitive 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 impedancls3etb 4n8z2de at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacito3tb4elds2 8znr 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 resn/qik (bj su; ev5cy,u7,xg4wistor, 20-mH coil, and 1.0-mF capacitor are connecnw (ui5g;k,74c/ xvbjys, ueqted in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected r4jjpm )5 )osqcj3eq) k1o9n vin series with a 20-mH inductor, what is the impedance at 1000 vm4os j 1qckp5)j3 )eoqj)n 9rHz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what ivz4*:s umjx1-01y*mr- n bei fodlo8j s the phas0-j 8i*vooy mu:z-*erfsld4j m1x b1ne 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 seriessfmm:9teqyi* +*ld y2 circuit with a 20-mH coil and 1.0-mF capacit *sy:q df +2iyme*m9tlor 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 resirvt, wi,te+)2 r4h2zhkkcu,kstor and 15ki,v)r2 tz,huc4 ,k2 +wertkh-mH coil to 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 i2u zf97 g4xt 3k4wnwopt*sad3nductor at 5000 Hz for a total impedance fk tzdpnu449g32a3o 7t*wxsw 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 put6(2wm6ymwpq.0;pku eo qji+ b in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 bim2m p6;q0oj pekq u+.w wy(6kW?

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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. Whkf 0tr+)4 iuvgat is the impedancevi)0u 4 rf+gkt 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 neededn p5/;8roj+ip yd9cwn in series with a 10-mF capacitor at 1.0 kHz for a total impedance o8;9 5 jncp/+dinw pyrof 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 seriemkh k.h6 u 59jbr:r,cedjj1o( s with a 10-mF capacitor at 1.0 kHz for a phase angledk. 6j ku9:ohjrj mcbr,h1e( 5 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 for a z1p50rrdk ot4 total imprk1 d 4p0zto5redance 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 10z7n9v5hqecq hibx hb /*:*w2m0-mF capacitor at 120 Hz. What is the phase angle w25b9v nhc*h:bqxmq /hzi *7e?

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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 if8p/.rc11: -qrppsal owt z hn1+w0xrt a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are.p11- o/xprczahr tnqplt18 w0w:+rs 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 ofccz20k pw,p .-b4px6s kez5a pmyvc)5 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 supply. What is the rms current in the circum-.pk6s 2k,y4azezpcvp05c wxbc p5 )it?

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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 *x)g 9 6t pxhyds2wws2inductor of inductive reactg xw9 wy22x*htp6) dssance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a ys/ho xx 8tiv(x701 ;awpf ks050-W resistor, a 10-mF capacitor, and a 0.45-H inductostfx1/sx xhpw (; 7yaokv0 08ir, 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 z2. n-fmj knh(ap50kta 500-W resistor for a phase angle o0zj(n2t a. p5 hkfkn-mf $40^{\circ}$ 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 habtrdt30d yt)*c wy y,;s R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dri r)dtwyy* y;b3d,tc 0tving 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 circuit gpq4s .qbj iia43z )79j4yhku with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit bgaj3 k4h 4u qijpq7yi .s49z)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 a(4rz /esc;t)bun, nu l9lad )sn AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of ucv- a0xr z6vo*1bxzw,,vdz230 W. What is the power factor2b1vz6- *0dxorv,uz ,xa c wzv?

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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 r1fdn3mvf+g3ykv2 m6s,d aa i9 esistor, a 10-mF capacitor, and a 0.45-H ind39fmkd s6+231yfma n,aivgdv uctor, 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 of a 1.0-mF capacitor and a 15-mH coil in seriesla/m - /l)trou. :2jxu mbcp.w?-aow jrmt2 lu/lc .b/ u.x)m:p

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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 frequ:mnc4/dop49 ogmz zq,encyzm ngo94 ,4z:/dmpqco 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 se5h hklak+ 2mv7ries with a 3.7-mH inductor for a resonant frequency of 1000 Hz?hm27v+lakh k5

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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 sjfax*mn5t fv* 7*k4 wceries with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz? ckamfnw*t4x5f*j*7v

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