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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/p8w-bd+ +ud8jau ocx 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 th e8a5m0ikc rzrn*3 s5xat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change o:6jb dcdwdfd1 feh29(n the c fb(1d:2e9f dh6dwdj induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic f-;) q lawg)serield through a loop of wire produces what kind of change on the ind-g) )wqaresl ;uced $emf$, 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 thyem 0pf t6w/en6 e0(die inducei de0tpe f0ew m6yn(/6d $emf$, 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 field 2m 01amr2gcga 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 phxax+,+c. lh law, the direction of an induced current in a conductor will be that which tends to produce which of the fo pac +,lh.h+xxllowing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovejvat86)ag:p 6.whm fr its center with its north pole pointing down. The stationary magnet inducw6p.f) at6m:jh8 ra gves (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held a9d+5qamp 1rh; kook1bbove its center with its north 9h5ra 11kdm;b +pkoqopole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the ma-zeoq y4wm 8 0(hu-0c:mgntqignetic field vector points straight upmcqm n(ug--o8:4i hzywte0q 0. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top im)m2c:k:d* za 0co salmlv m,(n a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the di*asvk) l0 d :(mmz2cm, loa:mcrection 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 a9cy u nse,u2r7kdta 5 :mcqq76 horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what m9 ,q6uu2 5c7kd7nasqr y:cetis the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ev6xocxo: s ne,zv) cw:5er-increasing current northward. Two coils of wire lie flat on the table, one on either side of 5:)cnc xev sx6o:zo ,wthe 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 througcsy8e goggeyxt/we0h 7w-9- 9h a loop of wire with the north pole entering first. As the north pole enters the wire, the inducewcye-/gosx7g 08 -egy 9wte9 hd 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 angulbg kp4k9j0e3q5(rynw ar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatiow05pn9q j(k3k y4rb gen 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 rot wq; b43wc4dtqated at constant angular speed about an axis whose direction can be varied3qwwb ; t44cqd. 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. 9)( ovunvq (ci(9pwei
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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 tq6 kzrjv57hm6 wl6 go*hat 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 magneti1m wf 52s:-rt cexjln76ib6byc 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 th3+w( gjn igs)se east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentia sg+(g3 j)wnsil 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 velocitur dye0: jssjb2foq66.8tx:yy $\omega$ 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 tranyl 3bjf-iz02xsforms

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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 througm*m/o/ dvi .kgh 60 revolutions each second. The frequency of t/oi/kmd *vg.mhe $emf$ 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 usioz1m- hk .zf9:8vifto (zf7s leo 7g(ed 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 tx5xkdx9 aoq+k/i5m* xhat

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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 cwqtnjhm., (*loops than the primary coil th .mwjc,q* nh(ten it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil k u50le*ummkvh5 eha2w)o ;w +contains more loops than the secondary coi ;2m5huw5ul0va + ew*k)ok hmel then 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 a2, wsk k5 8* kmblwm n5f0vhvgxn2,o0power 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 c-)azo 5o e:fgtlb3oruvht597 ircuit,

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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 j/z;iph9jzg- ttk.0u z(at* ain series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor isj/ztgzk iu-h 9zt(0; t.japa *

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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 seri rnv2/hl mq.b3es to an ideal battery of constant terminal vol/h3 nqb r.2vmltage. 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 8nasn,oc*xhtxq/ sp ty*.6a 3 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 inductalz5u f)/q 3tptf1zk0.svbs 6znce 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 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 ba7std:y ni- 9e ap7om6attery. The time constant for the circuit represents the time required:m7ay 9p-a7seo td6i n 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 conef ez:v5 7/( qzeucv 35fm*ibjnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of tb75z(me:c5 eue f3jfv zi v/q*he 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 same units mxf-j(3bocj8 except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, thl;imz y /p;/vc 1jjs(se 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 supplit(fv +8q 5soby. In this circuit, the current+f8ovq b(sti5

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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 changesn40m m p;bko0n by what factor when the frequenm00np b4nomk;cy 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 A7ivfk1-rr-un/3yhkm 7 zz7 t r yk0br0C voltage across an inductor is doubled, the inductive reactance of that indu1-rumrk77 k 0/r z0thbri-knv y3z7fyctor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the in-7itys8d k sy-ductive reactan -di8k7yts sy-ce 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 cif .5gu1h/xam(*zn h lxrcuit, the currenhz nflau */(x mh.g51xt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactang gzn28 8xx-ft4ug6nrce in an ac circuit changes by what factor when the frequency is t4- zx n8g uxnr8gft26gripled?

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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, themd;a;kji3, ek x/y l a439z 1dfmq.mpj capacitive reactance of that capacitlka3 j, d/zj;y;ai4p1.3 9m mfmke qdxor

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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 vijebg 9g m)om6wu93 q0oltages of the inductor and capacitor in a RLC series circuit?o9m 3b gqw0um)6gei j9

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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 definek7d12tz/xb v hd 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 increacj,l yyu8 i)ngi 8 s94a1dw,wises if R increases. Wjc941 ,g wnuwsliy,y)iaid88 hen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the ce4, u98(mbqiae fjh e dee++p1ircuit 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 circuit ta./be0 n.k1 9ksnp23b dgq gtincreases 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 tho vlt0onw.kv,p rvgj2 i*.1j/e capacitance both double in an LRC series circuit, the resonant frequency of that circ.vog wv1.pljkv,r n2o*0 jt/iuit 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.dr.vci5- g cuz 1.frmf:5(gkb At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whmsk, 9 tk87gpq:,qj ulen

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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 ra/kz1hr j5k-xcc1 l*hedius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when c5 zk1xc*krj1/eh- hl 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 magnetic field of 0.2rk8c qfzqf 3y183y-gl0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendiculrgcf yk38f18- zl3yqq ar.

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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 rotao hr+ eq;3)wwqting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mqqw ore h;w)+3agnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop i 4d,rhl a2 ba1hqfe):6fa*c vds 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 )wc3 kjh ,jz2 0gjf*jpfrom $4.0 \times 10^{-5} \; Wb$ 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 sidek.he0lbo*:0;(udm zeqy 04 5 gqk kwp3 w1ltges 18 cm. A uniform magnetic field is appliedm lh*:.(10d zwuel4350eq 0b qy;oktep ggw kk 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 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 5im/r9 dh0llearea 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 andf tyd k99eob84 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 2 pnuin*0j*d (kto ,jmf:d,zj horizontally at a location where the downward com(ik,0f*ptmn2*d,j uj d j:znoponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a con9h.wg)di) hoan :x jc9stant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magneh :c ig.9xnhoaw9j)) dtic 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:cv0sx5g ys l 7spv:-sm,n6 sa 50 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 10r8x z -eh dk,a60s+ewdmf;u,o0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 re(8i olk / 54mar: oqf)0enlfioctangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0k/) 5: 0io8enfm rf4loiq (ola.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 of wirepg*0-cud.a n ak-3raz ulq4cxa1 4zj+ 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 generator with an output of 8y81m(6ome b ;8m2ldyrp 8j6z onippyus3u a/12 V maximum whe mdmys yju(a6n6io 8m/r2 peo8pzy8p3 ;l 1bu8n 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 maximum kso1 od /mkwrrx: *r/*yo y+2e$emf$ 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 oprbj3ofbo++ , a 8tfu9jerates 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 mpkvev9l-.dh )yk((nmotor operates on 120 V AC, and when running at full speed it generates a nk ykldm- ( v.)hp(e9vback $emf$ 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.zokd34j,yuxfe05nn8 4n i5g v0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current? j0 n5k348uo,g 5 vnyedzifn4x

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplyonin8 q2woj qqi++ ;pr9w9mr (. The operating curre9iqwr8+ 2i;wj orm qpn +oq(9nnt is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to ah b9rt.o: (wy ;mlbr:r 24-V power supply. The operating current is 1.0 A at furm;rrtw:9lho y. : (bbll speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to rmlqw6,j x/5saq2ju o 3educe 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 cac:w9x aj f9) evsb6r14qb)pupuses 14 A to flow in the secondary. How many turns4qpv r)96efb: pxwb9ac )1ujs 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 24-V hj12z dkovf83v:lu.hseconda13u.k o:vvzdhj 2hlf 8ry has 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-turn p,v/cc, cz:rdm t2g /uprimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what iptvgr cu 2,dmccz:,/ /s 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-uk2c4hlf,vv2g,pq .h m j m9m primary of a transformer. Assuming 100% efficiency, how many amps at 24 9 m22-mlg4v jh h,q .pmvcu,kfV can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer providesl-sua( d:-jg*nvh9 yo 7500 V at 10.0 mA. The primary coil operates on 120 V. What d(- odsn-gy* lvh:9a juoes 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 g2kt u*rscw,ch.q 9) non its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the phkc)sq2 g rnctu* 9w,.rimary, 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 itsat 6ul-e+ u1zyvgz1 +k secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presez +-1 tl+v uaeuyz1g6knt 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 ulqx0aw edjp 4k6e0) klp.*4nturns. If the input current at the primary is 100 A, we can expect the output current at thepelkwq *d4ka0u0x 64). jlpne 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 tu u lf5v tec-zj +b4+xt30)pnrwrns. If the input voltage to wjlfx t5czbpen40++u3)v-r tthe primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If:trgj+;5 d tzt the power input to the p5+t tdg;:jtzrrimary 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. The voltage je34p rv4lsflt i : cicn3(i c.j6k.k(is usually stepped up to 4500 V by a transformer and transmitted through a power line of tocs:. rn6c(.ic jivft i(44ek3kjpll3tal resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped xw*: muon2b7 )/ x xpxes6bsm8up to 4500 V by a transformer and transmitted through a power line of total no2wbupxx s76:/m)* x 8ebm xsresistance 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 at 120 V. The voltage is usually sc gm-.9cl,ba.s3mtqc (dfej. tepped up to 4500 V by a transformer and transmitted through a power line of total j ems .q.,3 da lcbcft-g.(9mcresistance 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 0.60 7kjg4g0wi8m vW. 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. wgv 84gkimj 70 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 h4-2mhrdqx u :4r. vckbu/ ,1ifip/zplong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to vpcx.kbiuz/d: ph/uiq 4r4r1 m-2f,h reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a + virhlru) 6k16-W line at 1000 V. How much less power would be lost +6vr kil u1)hrif the power were transmitted 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 generator is 440 V at 20 A. It is to be transmitcyr/r 52zt2 yx2nze,tted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.01c/52r,n t e x2yt2rzyz0% 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 is stored in tpuio mt4dq7: yy(3 am5he coil's magnetic fp4i:my 7 tqduy(3o a5mield?

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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 ands4way7 tkuwf 71b2m vul1e(8w an 18-H inductor. What is this circuit's time co y7m(bksf4ta28 vu7ew u1w1 lwnstant?

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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/r.x2q7z xnn gh5)u f9ynaw+r 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 plac vrc ii7twj6p445c4 jhed into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC out (b*1p x2snulslet. What is the resistance of the lan sl *b12p(usxmp?

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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 b i,j+ ro 5mxyi+go;0b45sdh zac power supply. What is the peak current mox d,++y 55 gihrb 0j4bzio;sthrough 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. qfxb1 /oj)y+ 4 85ki :rtxm,9ynzfddw What is the power dissipated in j14wyd)fn+dix/8 :f9zbry,5 xkqtmo 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 resisq5y) h:sb3r njpds2 hi,4yot 9tor 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 cy:gmkc(ux vvru0icg e 3w/zo)+c; ;4resistor 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 akezu)/, ,mxs9dbj ql5 50-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*dl2 w3a(hu vnh0u7z m 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 2ey o6g;uv ge6 isb3(y-.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 c)p1ct( p4i4l yad bwd4oil 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 )wfpl2eix+up3u lg 7/inductive 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 at a frequency of 20 jtp jvg-;p i 9r7/ 2pt8t9mbobkHz is applied to it 9gttbi8-pp m7pro/j9 2b j;tv?

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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 throa hlvhc1.,k t.0u+cd wj3q/ib ugh 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 reactance of a d +;mxma 6jf4 qkmxezf8o9; y-4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of,/ +6r agpnt6lbc hii(gx :5yf capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reayjp,2 er5j 4fq x2l(pactance 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 capac5oco ej*yd9bpa0 0 -nazee 8m-itive reactance of a 0.010-mF capacitor be 100 W?0pa*j0beoaoy9 -58dm z-enc e

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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 ryhozp*q n/p9/ elf/*4b :qaq a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resi0wzpoj z7 .)mvkf*w: nstance, 15.0 W inductive reaon.) wk*wzm7:0 j pvfzctance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 150sp9at3v3 sm:rom i 7oy )f-l+r0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriet37sal:rvf sp )or9iyo -3+mms?

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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) ; ff3l lpzb8nscx k,;0 -jpduok3ws1 a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are ,10)jpof lnd-3x bkkp3;s sl;cfwu8z connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH ekoo qnpbh2 :7x4 h;6binductor, what is the impedance at xbo;qhn724:kbh6ep o1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whc9y7d5 mr-p0oksam 9iat is the phase as0impadk - 9 95ycmo7rngle 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 a 20-mH coil and 1.0-,:d9oc5 k39mexzz z ikpj:,jrmF capacitor for a tota3zikopm, dkje99x:jcz ,5z:rl impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor 3o rw.kpl s-vf1 -ama9an v ama3lk91 -wpsf.o-rd 15-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, a(vnufg1ca m*idhz +9z*sz 7 with a 450-mH inductor at 5000 Hz for a total*1(iu,n9hgs acf*7dz zvzam+ impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series witsgeh6+t r 7h9fy5s wn6h a 100-kW resistor at 1.0-MHz for a total impedance of 1507gyhn rhe+s 96 f6w5ts kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the impeoti f4 - o1lcasyiv)l;8ed4m3dance at 1000m y-livsie4olf 38o; 4)dact1 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 needeg vbgy(p 3g+t6d in series with a 10-mF capacitor at 1.0 kHz for a total impyg6(v3g b+gpt edance 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 withol vzpcus7; 99 a 10-mF capacitor at 1.0 kHz for a phases z;9p9 7olucv angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W revf5hq3-8iv 9rapw t3dsistor at 1.0 kHz for a total impedance of 45d 5 p8-rqv9tw3v3h aif 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 c5c6p g5nidp 0l1a-w qtapacitor at 120 Hz. What is the phase 1pd5 l w-ct6n5gpi0aqangle?

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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 resist0hjr:u6xv l*wor, 20-mH coil, and 1.0-mF capacitor are connected ixj6 rvh:*0ulw n 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,m 27(mawh2zuvc w9 yy0 a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What i2cuvh9a (m2yy w m0wz7s the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactancpif w;6z(hgb8vq 6f5t v;l9kbe 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60htw gl;6iv9b(5zfvk 8q f ;6bp-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 sjhwgo)(pf4o g y7f8 1ceries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz p4jw) (p81gg7yc foo hfower 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 sericcp 0jgb*4u cxd)b-l9es with a 500-W resistor for a phase angle of ux* )lgp09 4cbcjdb-c $40^{\circ}$ 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.0s 6t:j3bdny n c9:u*wtpx+ sc At what frequency should the circuit be driven in order to have maximum power transferred 6:sd ucswtpc y:9n0+*bt xjn3 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 invz lm5 hm13m-+uw;zb*z w7faf an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancezza+w 71mb ;mu*zm5 f h3vl-wf, 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 ana zw(b 7)o2axd 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 3.y+0 jmeq ztbc6qf e)90 W. What is the powe9t6) m0jzyee.qcbqf +r 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 factog3-t kk3p1 xepr for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz kx3 3p1ktgpe- 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-j+ig-l7rpi0n mH coil in series? j7-iln0+grip

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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 sesgf79*5qrvnv ries with a 4.7-mF capacitor for a resonant frequencyn75svg v9rf*q 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 se1rx b7w 6.y9ita b;uvmqj. ln.ries with a 3.7-mH inductor for a resonant frequency of 1000 mb..y vtr6i;w71jxq nu.l a9b 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 s54 qgih6rb v,deries with a 30-W resistor and a 40-mH coil if the resonant fh v r,igdb65q4requency of the circuit is to be 1000 Hz?

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