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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: 游客未登录  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 i( 1/bdkh9e9fln*bjc magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that the-+nu 7gfp 2u*l25ocgh*l up ph $emf$ 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 produce7/qin+s vtu3p sf dn*)s what kind of change on the induvs7t3) /n* d fpquin+sced $emf$, 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 ta sv djj1;pox3/kc. s:4,vv uthrough a loop of wire produces what kind of change on the indot4.1da; :x /cvvss3,j k ujvpuced $emf$, 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 whu;qkqbx e x7:q7)ur5 o5t;wafat kind of change on the induced qu55 qwe7u xx7fatkorb ;);q: $emf$, 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 fief8p5 aw*+zqg xen8l 3 8xz8qa /s;lpcdld 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 i u6oe -c1va:lwnduced current in a conductor will be that which tends to produce which of the following effeoval: 6w 1-ueccts?

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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 horizon .rhs0l*/nerjvb c8q. tal table. A bar magnet is held above its centrlvr bj 0/n*eq.ch s.8er with its north pole pointing down. The stationary 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 on a horizontal table. A bar magnet is x wydrm+k f;55g r7o/+id4xx iheld above its center with its north pole pointing down, and released. As it approache xi;g5w+r5m ik7/r d+o4ydxfx s 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 tabl1 fc)a7nvm i(0 a unb7qa8;nnie top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as n0(8qnun ma77faiv; )ca b1inthe 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 region where the magnetic f1btdb3 bomi2 02y v6dyn(-kl kield vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil aki-n2yv( t03od1 dkbmbb 2yl 6s 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 mdo.s ;g /2bugdagnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as theo.d guds/;bg2 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 abwwqw ,1 vm7y bvz0f /)iq,.ic horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed frw wb1 /b,vvqfm.i0iz w)q 7cy,om 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 firstgt17 * p5lh3ywqglx-ciabrk+u+ 6dk.. As the north pole enters the wire, the induced current will be (as viewed fl*rl1.-u d5gh+ k73ipyaqk6+ xbtcw g rom 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 wi8.k djjfx-.qqrd +6 a xfi;6jlre is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what muiqr q8fxxdd-f;6l jkj6. + j.ast 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 as :dzp 3chr7o2xis whose p2ozh7rsdc3:direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the 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.w/s2x2hp rxqil*8 dia* 8b; 1v rnsd2h(/lrn a
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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 ands1 j6( id2,m(kzhayxk: 0qpj $emf$ 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. The sn o:8medrh 9.$emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west directioz) wu: 2k0 uud6gvl7qyn) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across thl2zg:u6u7 dykwq )vu0e 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 ang:bi dejo-+t :ym( b:de.xe6 wzular 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 traewa;a*gbizq:/m q rx,hp633z 5tm 2tznsforms

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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 re+og uno,- ;notvolutions each second. The frequency of th +nonut oo;,g-e $emf$ 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 r*4 .cl,zee ke3x6qq bx ;ni)zto

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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 ths 4 dzf/mlg0;bat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, ifjiq rfl :na07ap0, 8 tznj2o;p the secondary coil contains more loops than the primary coil th2oarp qz n08lj:pa,n f;tj70ien it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if t/udo nb70sla1 he primary coil contains more loops than the secondary coil thl0b7soad1/ un en it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpum b/4shwu *+zbd2+hb pt

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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 b1*hzob3cf 9 a 7swa viylz05,jf1mp 9circuit,

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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 tf4gt c+rpj:+zhr4 z5y ql(w.yo an ideal battery of constant terminal voltage. At the moment contact is made with the batty .4g ytf q+rh(zj z+:cr4plw5ery, 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 cl6d5/p4hpz q)c *;x ye8rscs- fz-yesonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the ind *6s8y dlpeh-rsz- xc ;qsy5)e/z4fcpuctor 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 in4)/ l,j0bq.ypf bnllda8k agr 6tp9k s,)b7cpductance 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 resvpb/ xa3e*mi dd9hv* 5istance 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 sqlrw; otu.r6o)+fb f/2 t,anin series to a battery. The time constant for the6 u ntosro.);/bta2+ ql,wfrf circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connecte)3jrujk,rhkiu*ul, . d in series to a battery. The battery is suddenly removed from the circuit. 3u) ril.ju*jrhu,k,k The 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 v17m wiylg8sk*kf24 l have the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power sup,pw+p +,tyscu ply. 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 supply. In this circuit, the curre( vnsx x(d a*nu4+vco)iw2hhg*mw+b(nh+io swvxdam+) g x (v( 2cbnh**u4w(nt

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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 b9gtnj 0xiw u77y what factor when the frequency is tx7g07it9 wn ujripled?

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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 is doubled, the inductp8lcu 0wxw: v qn+bu,3ive reb:8cu3+n,q lwp 0w xvuactance 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 vol ak(ec .vffdmsb8*4o0tage across an inductor approaches zero, the inducti4eb8( *foksv0fc ad.mve 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 an AC power supply. In this cindz.7d66)ijqznqc t ( rcuit, the curreq6.6)ctn izd 7(nzq djnt

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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 circu9e; 6+jrx1w8m;u fowh w2)tgq1uex jpit changes by what factor when the frequency is tri +o9wxej u q6mfp)rwt;;1e2j1h8 gu wxpled?

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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 vov,ti,hu( tp tg+4.hiy ltage across a capacitor approaches zero, the capacitive reactance o+,u 4.( ti ,vthphiygtf 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 o earb18f(sj 7vnii1zi9spd1o3 p )f(fs-k m)inductor and capacitor in a 7(ap mfpjr8d zfvi1si)1)nosf 1bi-se39ko( RLC series 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 R+k dl9k- zfw,tLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. Thv1+(u)r* slqb dl hd5cbr) fs+e impedance of the circuit increases if R increases. Whenh+urq5(v )d1) lbbcrdss+ lf* 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 impbd xkn:0p1rvi3 8e5vd edance of 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 circuit increase52rr/sfxy q 6lty)ql)8,shigs 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 themlv)bhk 3yukx7:h2qwe2u +mm (xd- -v capacitance both double in an LRC series circuit, the resonant frequency of that circuit wvq m yv-2 mh2 uw3xdhek-(l :)uk+7bmxill

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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. v/yxr.zdn 9cc0 -2lky 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 circui9 77b7,l gxmzl6exfv 5sqf 4qrt 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 fieoip s52jv7yk 5ld of 0.20 T. Find the magnetic flux througyv72 5ip ojsk5h 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 magneticmp3trd 8ol d53 field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fi 8ldmdp33t 5oreld 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 radilt 2on3iy f-l/us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wh nif2o/tlyl 3-en 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 tm: kpyywm. (gii912b an 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 changes frox pri5g8i,2 vawwai (;tq)+fdm $4.0 \times 10^{-5} \; Wb$ 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 pnncplbo :8 4g 7yg*f)8 ijpp+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 value of the incy l pni+ :g8*j4p)pg 7bofpn8duced $emf$.

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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 area of hvmd//fk f4im x34 gx,$0.40 \; m^{2}$ 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 andjgdn8a h,b0)m 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 ux(f 7vv3vfgdh +d 8f560 m flies horizontally at a location where the downward component of the Earth's mag vf ux+gv(53vdffd87hnetic 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 tb-99/av vvjrhhat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about ah vavj/9b rv9- vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loopztd v06 .-r;lttq2b 68acbqqgs and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns oi./ ggfzm9 r23i2g(kcjtx9 bb f 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 rectangular loops on its armature. Each lb) y vrb:hmcgfx z+8 e)0yq+b(oop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis ofxbz))mg(y8qbr + fyc0:+vh be 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 consiqlg 0. u7m(fmlsts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish jeut q2f9g hz2te/c0 )eik,d4 to construct a simple AC generator with an output of 12 V maxtz2kue 9,c/2jdef04 )egqi ht imum 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 gey8ya-+ xa(y htnerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opj, fs -lpa-we2erates 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 e4 t/ t+mb jn9a2kwmcs70aor9W. The motor operates on 120 V AC, and when running at c 9k9jnows mera0t 4a+b2/ t7mfull 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 internal7a-m 6mp2)-pnxsp oko resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Wo)mn -k 7pspmaxo 26p-hat 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 i ud)q2v,8xajkc yzcqm8be)(0s connected to a 24-V power supply. The operating current is 1.0dv8qmx 2cuqk0(y8z)c a bje) , 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 resit hbt s cr(60o3-+zjjcstance 6.0 W is connected to a 24-V power supply. The operat-c+brzh o(j j63ts0 cting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to red.5.c6 rizicv suce 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 14 A to flomd)dz +mba98m w in the secondary. How many turns are in ta8)mmmzb9d d+ he 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 hynf3, 6dus*o;xo2f7uu9v6d eirj, zprimary if the 24-V secondar3nud*xff ;, y6u,7o vuie9d rzjo h62sy 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 primary coil and a 2000-turn secod gi 4/5leli;pndary coil. If the current in the secondary is 3.0 A, what is the;lgd/ie5 i pl4 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 transformer. Assuming 100% eff -qtv-rv.: hpm4hpz :kiciency, how many amps at 24 V cav.4vt h:hp-:mq-k pzr n flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 Vs qc1nob:.;vm pv*fcag)+ 5 lu at 10.0 mA. The primary coil operates on 120 V.nafm1qo5b :*lv cvu p;+gs)c . 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 turnsv3hnoa e8 *)vx+yzac3 on its primary coil and 300 turns on its secondary coil. If 18oa*zn e3hy)3avcx+v 20 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 6hdw,u8q a):d85ho1or2vmzr b0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied t5 )wdm:h z8u rqodo,vhb 21r8ao 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 /oxmjpf5( gu2+w9 weu its secondary has 200 turns. If the input current at the ew g(f/ uo925jxuw+pm primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondar92vd jx.ttin yu :mtz n4m808ckm;k2 gr ta0.iy has 200 turns. If th ut8x2 zmmt;.dv2iy9 atnmct4jk.r 0i:0kng 8e input voltage to the 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:f2 ;ca- uylqp has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)2 ;l q:fyc-aup

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces:otrf n15 ru5q 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer:q5 5tornu1 fr and transmitted through a power line of total 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 ea w ),8i:d*p0e18c mu: easwlhx(yd gV. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the t,yp:(sda1eg m8:uwxli0wh ed e8 c*)a ransmission 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 currentz21,s0rfyff2,r lga v*o kmd: 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 pow2* f 1gryklmavd for,,zs 20:fer 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 yc qjj+x3 w50ko 9e15,wvpcioof 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 uwic jq59oco1k+3wyjep 0,v x5p 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 a totan8jr5/jhcv5zi j2ws ;t,q06 t15afg w rzjy y6l resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissrjfq60vw, tyh;5rc 1saj y5it gzj8w25jn z/ 6ion 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-r4enf( 6yplw05cf48su3 e bdmi g8,m qW line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 100ndeuybm 0l(ipg 88qf c6few,4 43s5rm 0 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 transmitted onaaa(. w ma jir/j1w cds0-4(dl 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 0.010% of the original poa /mi l0wcdrd 41a w(j(s.-jaawer?

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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 ag(ac542a9uuj/aa s ch q*f16. fovmsm current of 5.0 A. How much energy is stored in the coil's magnetic fi5(fafo. macha 4uqs uamg *291 sc6/vjeld?

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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.c )f/iysk 8fsj4t 4j2w What is this circuit's timyjw/ if4 cf4ssk)8jt2e 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 axm h23;;ggi;wh7 yvo lz w(:lun AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlxwmqg -l9 z2) .za3wct ;ghafutd9-,fet. 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 outlet. What is .bg32f-rvalb+ r 7ee.dcecrf;t w, /ethe resistance of the lafrew+7t rc lde b-,egf.3;r e cbav/.2mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cu(i bqf5 xq7(c. :uhhyf8thpa 3rrent through the resisf b(pu3ha85qit.fy7qhc(x : htor?

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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 gdnww ro2- z.p zd)5c(power supply. What is the power dissipated in the redd)g(zo -nc2p 5rw .wzsistor?

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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 resistor p-+ r rhco/+xsis $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor im t/y mm(m+tx) d3ll2os $I = 0.80 \sin (240 t)$. 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 50tcgk hp/b9rv/azf.sb o sg1 8c/2:,jx -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 inductor at 60 7 mt8)noye +xvkxa)c2Hz?

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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 rek9u pg2urol9ay4(sxpe rrx8/ 4k gk65 actance 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 reacta5upcmbb;8 p 4(-hfql hnce?

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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 )q; v/.0r30dahatb dirsl (sb)g4bgx;w dl5 p W of 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 frequenc6 q y xaa5 41z.s5zqtwzdr+e8py of 20 kHz is applied to it+stze daw xyz 46r55a p.z81qq?

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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 rw;r p,s*w:0*,gk x/udp5hiyz4mu e vto 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-mF capacitor at 10ae h91)o1g: *+leu psr 9sqnrzt)dk+n 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 havx5t*zv ljmhff8;mw 6 .e 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 1qpkvgo5(z31 up j 6ksujh 0*5e0-mF capacitor 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/f2hyi(y:oqetf,8 k ,puj b)q+hfj ;u 0.010-mF capacitor be 100 W o),( i;f/e f,by8yt +ujhphk:2quj qf?

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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 tp9+qdr9;tc /d l+efdgr am y m-c g+o*ei0u)+ihrough 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 resistance, fqre786 ri9 br15.0 W inductive reactance, and 10.0 W capacitive rfbq9r 67 8rireeactance?

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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 asf+s,jl.se.1goj -zp,ei pb 3p oi(+z 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar,i+1z.fj+plzb op sepg. s ies3,(j- oe connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and oh5(pen (huq-,gni o4 xg2kl 41.0-mF capacitor are connected inl4-2no5qhoph4 exi u ,(k(ggn 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 serie((i2oatw6y :rt7rx eds with a 20-mH inductor, what is the impedanw(a6di y7re o:xtrt (2ce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor/gug3 ,zfb3fw , what is the phase angle at 1000 Hz?wu3,bzf gfg/ 3

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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 ,x0a)w7o3o ofko xssmw .+nn*20-mH coil and 1.0-mF capacitor for a total )so+ *3kmo xof0 n w7as,o.wxnimpedance 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 anb8t9 sq *g+gozc4 *nzad 15-mH coil tn g98 s+4 zaoztgc*b*qo get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a to mcf+nq (27dbl gd1st2tal impedanceglm+2 ns tb 2d(7qd1fc 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 with a 100-kW resistor at 1.0-MHz for a d,e:x*2olpi htotal impedancexp,e:dl2i h* o 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 connecte0dd - m-l -,*zr7umcswjpz1fhd in series with a 20-mF capacitor. What is the impedance at 1000pm-f*zu-dzr0, 1d - m chjswl7 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 series with a 10-mF capacitor at)ui5 9,2clns+ ntphca 1.0 kHz for a total impedance of 45 W)unsl 2+, nhipc9ac5 t?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor ate8* r29kqpzc.tz0 eqv 1.0 kHz for a phasev2pz9 * re.z8qqck0te 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 arnv/kwo7, d3d 30-W resistor at 1.0 kHz for a total impedancn7 r/kvwod3d ,e of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Whad36sn m53blnt t is the phasets6nd35 lb3n m 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 1f1 ;ls x4ju,phflf q9100-W resistor, 20-mH coil, and 1.01; fx9f, h4slqpl f1uj-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistoa rjkw63sg9n6zagpxk3(bzp x21 n 7. gr, a 10.0-mF capacitor, and a 0.350-H inductozga2(rk.3pg 691k as x37 6pnwxgbjzn r. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reac7x y,z9cr)nu +- gylhgtance 30 W, and an inductor of inducn h)-c9 yyzr+x l,g7gutive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase an ; tc l5/rlip02mlpoe/gle 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 power supmr 2;llei0cp /5 pl/otply?

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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 e*j;d 4zv ls;oa 500-W resistor for a phase angle of z4 *d;j; elosv$40^{\circ}$ 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. A:4bp 5 nc wm/5r-k+(pgfbstc dt what frequency should the circuit be drive/+g: wdtp55pcm4b-(cnsbfkrn in order 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 circuit with 1b 2jjbblt2u+)qbz8 (p2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecteq ujt zbb2l)(2b p+j8bd 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 ae:q 7t (*btoawn 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 l v.hwd/:j+g i7 oqf,: wvdxg;impedance of 60 W and a resistance of 30 W. What is the power f g ;.:d7+/h: joqgl,fidvwxwvactor?

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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 RL8x eh8uwpeu* :f./qc tC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conw/p tfh .u eu8:8*xqcenected 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 frequencyfseux8-2*u e82my(b bpy- ren of a 1.0-mF capacitor and a 15-mH coil in series?8 r2nf-muyx*e ubps ey-82b e(

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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 sbic1dv3-ofs/+dd*-)b v ww.nd bz w j(eries with a 4.7-mF capacitor for a resonant frequenwivwn-3d sf+*o1d/dw .cdb()vbz- b jcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH induct5m7.kk2dq*a p0 ; sfq/hf wgumor for a resonant frequency shg2ukffmaw5/k . *;p0qqdm7 of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in selgon, q(tnf2l q73l+nries with a 30-W resistor and a 40-mH coil if the resonant f(7l+ ,q ngflqno lt2n3requency of the circuit is to be 1000 Hz?

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