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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 o,;5g uzte1vgb; p ahl yi(8bj+f 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 indn z hoz r.8s ryekss5bu/7k.:4uction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil pro+riz3xf5y a t;duces what kind of change on thefirxt;z y a+53 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 field through a loo :liyh o*7p72 qm,nilr oh ua9lg:5w+ip of wire produces what kind of27q hm pl7l:,wnhorl*a+ ig ii:9o5yu change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the iyn9f.l jo -6eunduced9fu6j yonl .-e $emf$, 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 fiev lb jzilh h5ondvj6o; 9zc0 +64rd1it 2c2wn5ld 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, th 7sv 1a+ e 6a5un8wbs(xnxhhti9w. m.pe direction of an induced current in a conductor will be that which tends to produce which of the tn(8wwa 6 m7.5paxi bhu.9 s+sh1exvnfollowing 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 *+n:-b+y erv vv i4*n gwsko0 cbsh)+ha horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abvvh*kb : 4s is +w*+vyeogbc0h+ nn-r)ove)

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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 p5hk2ze0wi,:rzpq9 e held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magp hz0p2i, q9:k5er ezwnet 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 ) ef)z iln6x*n33bq8 veq5szwregion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of thi s n lqbw53*fenx8zzqe)6 v3)e 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 tabhnk4jqtc y4 5s3) ;hijle top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whei5) kychnjs4 h;q3j4tn viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a ;k.p:0fgjl4 k c)micmregion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed fromc). kj0gclf4 :m p;kim above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-incf.x (xz 0ddk: wz);vllreasing cllzzx( fd0v k);:.wxdurrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the lqzy 2- (nrxw0north pole entering first. As the north pole enters the wire, the induced current will be (as vieweyrqzw l(2 x-n0d 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 angud( gvn (8gqcxe96-pmplar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of8n9pe-( d(g6pcv mxq g 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 conn ,vx9nvrdy -aes77ex9n7rs y14 l7qsstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fie,sd7q 94eenr71lsx xr- aynv v7ns79y ld 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.y(zhfj 7g) ep,
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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 thati; o )bj5 l v2a1rci,i-pkuxz5 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 m:,b rr.v 1kt..hqx ohmagnetic 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 the east-west direction) is moved northu k44 dpvt:pp;ward at constant velocity through a magnetic field that points straight dtp pv4: dku;p4own. Make a statement concerning the potential 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 bqt6njl nwx;y3pn w 5l29uv71iar rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trans f/eurml.bc c) 41 h+immw9u7eforms

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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 throy33vhyaw v2l zlco39:) u2 bjiugh 60 revolutions each second. The frequency of the9 juoy3bv2 :ai2zhw )ly 3v3lc $emf$ 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 use*5.eq9(o uldki gi.b od 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 -lnhh16 ccj q3that

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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 jhhe8 1ojr518 (:jay 6rfsqvomore loops than the primary coiljh 6 15jqr18shrojof: v(eay8 then 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 primarxl k(,5w9ql;:il usyljg ,z1w y coil contains more loops than the secondary coil wyzjlswgl ;,ui,lk:l(1x5 9 qthen 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 k5n0p ii phy(;ma:s,cpower 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 circ0tj iux5e :i-nv5v*y4/akhetuit,

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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 inbh(v1fav6qz u6a0te r/ue+p :ductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battert1fe6u6h z/rva eq:(+vb apu0y, 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 anxlyqv7 i.h :lglqi(b a xau-5 +,;qjw. ideal battery of constant terl.v:qjx-u;h gx7+wayl.l a (q5biq, iminal 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 withwi 2rn(jl m1zgb:a.2g inductance 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 resistancmhb// y x4fl89mu 0geee 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 conne63g(hm q)/ogd9vhwv nvt v.(d*tial8* fz 6mz cted in series to a battery. The time constant for the circumzw(qnm dv 8t (z*)odhgit6vg6ha 3*/ . flvv9it 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 6;m)qc f w8l xpme+xkxz 6alx4b1x.j5connected in series to a battery. The battery is suddenly removed from the circuit. Th86kwxxx41+ q )j zfa6 le5.pxlm; mxbce time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unif6(e dg.y h3jlts 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 ay za4oj 1-euie y:e5(en AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is conne/y qse*06qhk scted to an AC power supply. In this circuit, the curren*0s sqkyhq 6e/t

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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 d.iy qz b4c:l2changes by what factor when the frequency .2 z4:cldiqb yis 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 inductor iyjdm9: v33fbvmoz- o .8b5e jcs doubled, the inductive reactance of that injbbe.:d85m m v3yjofov3-9czductor

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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 3ln6-s t+klq+h t 2yhxan inductor approaches zero, the inductive react+ 3lkhtty6nl+- qhx s2ance 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 circuit, the cur.ah8c7 e(mws jre jasecmhw. 8(7nt

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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 wh/:dm-we4 jy ;tmrh /ebat factor when the frequency is trip/; jdey:4wm emh-bt r/led?

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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 Awbobkm u r)4/*3 exe07)vhmrmC voltage across a capacitor approaches zero, the capacitive reactance of that c vr/b7*)k0mxme r)h3 w m4oubeapacitor

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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 w-up- u dlez57capacitor in a RLC ser-e dpulz 7-uw5ies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit8 frz w)5(6sakn k,j4zfckrd 92(whco 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 circujw9 q6kxum 0kf+ obbw:2y y-tu8h9dq, it increases if R increases. When is this stydwb:8f0j2um-o9, wqqy6u +9 hbxk tkatement 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 cirk4jsz7,d6 fpneivz p17,tuv+cuit 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 impeda,vymiz6z( 1b m:wid *fnce 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 capacitancejnk 5nu0 7bvr: both double in an LRC series circuit, the resonant frequency of that cir7bnu:5njkv0r cuit 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 thatd vfie*.7q too7ga:l2 is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuk9im 7b0dw mdfa 9o,u1g yq+9dit 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 fieldr: ;wz(xpky7icbvf kagc x (j03 (kg01 of 0.20 T. Find the magnetic flux through the loop when thevkprc(wi7z gjk1:0xkyc (gf3(b 0 xa ; 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 ofpab cr1l+oidvr:-j3 p9.cz:k 0.20 T. Find the magnel9ci-rdk cp.j: a+r1v 3z o:pbtic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotbh86)abq t0xh*jpur2 ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fahr qp bx j62b)*8hu0tield 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 0cma hu.r9nbr( x h4gsh b93v0o zwq,f0:bmf;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 chang;pa -nfl9 jh, 1rtzv:aes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cmctrgm )*. dp u.uk9sf-. A uniform magnetic field is applied perpendicular to the plane omucd9s.k g ut)f -p*r.f 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 are uc/z:dq u e(q*y*i6zao6e1c8hg ok j+a 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 aj; 0;1ie9 dag d)rkukpnd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where cf5x kdug7c (3the downward component of the Earth's magnetic field is uc5fg(k 3xc7d$6.0 \times 10^{-5} \; T$. 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 lodz o7.k )sz4 zfo7rqj:ljg,g*ng rotates at a constant angular velocity of 2.gd)oj zz*fko4l,q:s 7.z7gr j0 rad/s about a 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 loops and a cross-secti(+8u5l nm)dmx8dmpsy n8oq7a onal 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 consis- nuw- 4g-lc2l32m tspp5jxw lh2/tznts 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 $emf$.

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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 loop is 12 cm wsqhhncggq /4 0(xnrr107p 9slong and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maxr9r gw/nsn4s h(0hpgqx71q0c imum 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 wire of area9j:v5./x b ueuw yez 5k n04+vgbfbv,a $0.090 \; m^{2}$ 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 c- sc(5v7*zn4 g k8 awd;dcauqgonstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the 5g*-u wkg7da;(8v 4cqcz adsnarea 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*svfyiuvkqn2m )1r4 pfq; . s.6bj.lw 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 operates j8:v y; wldz(f*ma u+pon $120 \; V$ 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. 6xpoarkf :xlp7at,-4:f. dje The motor operates on 120 V AC, and wklr7 6to d:axajf,:4ppf-x .e hen 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 /htfylg /1:fj-ad7d q is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curr-ldgt/:1 ydqjfha/f 7ent?

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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 *uas da +,93*w i4eai0 zmimtda 24-V power supply. The operating current is 1.0 A at full speed. What is tsuad4+a3*mmi w,i *t 9di ze0ahe 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 cp.7tpd6rb x u8j9vd9W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whav drc9 djtpub7x9p68 .t 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 reduce a prim.v */ t;azlytahc.7ymary 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 flow izpaw77 sdm9fp+nxt..n j,v d .n the secondary. n7wp ,dpsjmtavd +n9.fz ..7xHow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24xx3ny13 kg;n) m o4lwu-V secondary has 13m1)y kul;3nwxx g4no 00 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 a(ho6kr 9s/kr znd a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prrh k(6 /ozksr9imary?

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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 primara s7su/;/ltt s 9yio0by of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in th/; s09 utsosy7i tla/be 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 oldw*d.6 /+xrvlqsx,w f a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. *sqdlx/ w .r, +6vwxdl 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 on its secoyw58 ey.nn 9yi(re8nendary coil. If 120 V at 2.0 A is applied to the primary 85y e.9 iyyernwen8(n, 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 coin,0k ii3ntadm-d9v-: wj y;a kl and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present kwy;vnn d:j 9d0,k-a-a mt 3iiin 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 tups i7 -: , dybczz5p3ln5jqu fg(z;c,brns and its secondary has 200 turns. If the input current at the pr z7dbc5pnyq ;flz 3s-(zcig, 5jb:p,uimary 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 hasg(;e jsfc-ee2l1cl 4i 100 turns and its secondary has 200 turns. If the input voltage to2gj s f-c4ce ;ee1lil( 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 1ciuvgnp6aoz; 4)j+ tand its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power ouv o4 c )p;gunatz+6ij1tput 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 is usually stepp )cus 8.feyb qb;q3m7ked up tom qfsk3b8ey7u ;qc. )b 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary 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 atz7nlxh +mr(8t9enox37nczs;)a 0i yv 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.yvzanm3x) 0(crzn9;x7nlo87te s+ hi 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 cur9 m bcv.4fw4gjrent at 120 V. The voltage is usually stepped up to 4m .4wcb4f vg9j500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is 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 op(a*c kl*3y/qwz qs8c f 0.60 W. A generaty8q*/( sp q*z 3ccwlakor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if 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 nyo73*df ty tdx8)p3e long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due x) t3 8 *yf3ydtp7ondeto heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How muchq5/ ,f(uxnrdl less power would be lost if the power were transmitted at 3000 V instead of at 1000rx5u,n /dfq(l 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 on a lia 1aa /z:xdspb q1(8*zcjxj b0;1h qgwne with resistance of 0.60 W. To what voltage must the generator output be stepped up with a trans;q1bdqbzx0jxh*/as8wgcj11p aa(: z former 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 currenl,wq.4gzm d:v ba(4pft of 5.0 A. How much energy is stored in the coil's mqvawp4.z, :dgb(lf4 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 x5 nxs41t7eute8:pf/njj y i (an 18-H inductor. What is this circuit's time cye5i1nf e7s xpn8x/utt 4(j :jonstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 yot*3 mqo1n ylt1 wt 9e:b t-*o)*vsfzV?

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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 ou1.3o5yeno8 z9oplez7pp z) v 6rkkx4otlet. 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 io7 wxs 6,5cbogms3;l is the resistance of the lamp6owg 5, xbs7oic3;msl ?

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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 st v.+2e(gbhivqsy a0 ;upply. What is the peak current through the resii(b.tga+svevy0hq 2; stor?

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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 corcrx+ls226t 8v 55zyylpt o 1fnnected to a 120-V ac power supply. What is the power dissipated ins vycol+fxr y2z185tp6t2 5rl 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 resistor is wm,trj./ syj* $I = 0.80 \sin (240 t)$. 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 re1la2 kyjo9pio/gfd3s*h5pf/ sistor 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-Wlpjthmr3e5hn ( -ue),(8jo ja 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 a5 1btw7pnm6 k1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1xs5fr3vg4cc fj,)8 jm000 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 coion kg,x9 0ci5dl 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 necessak j7)xja o+3, ahsx/akry for 157 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 frequency of 20 kHo:8z alcv:qg 7z is applied tovaq c 8:z:7gol 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 throzdg5irz6; bk;1gqw*a pv. (dhugh 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 4.7-mF capacitor at 10 kHz?cvm1(u2n dsb.

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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 capacitive reactance at 10 y* bz5 x2di 6bbcgnlrq,nj,:/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 recioz q.-nax(/8l fvi9;r.ar xactance 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 capacsk 1 s(mi on3f/g)3h90re grnv2hz4hxitive reactance of a 0.010-mF capacitor be 100 W?4 go(/02f 3esnr h3)x1sz h gnm9rivkh

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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 1000 Hz and 5.0 Vgo8 rpt1n- 8uk*lw f+w?

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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 wi;jub 93.j d ./1f80,wbgoobdlq go8o8uajux jth 12.0 W resistance, 15.0 W inductive reactance, anuq.j,xbjf gbba1o;wo0dg 3lu8/9 jo8ou j.8 d d 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 1500 Hz if a 100-W resis2lcixe ma(+ q2tor, 20-mH coil, and 1.0-mF capacitor are connected in (2q l+acm2ix eseries?

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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, an0a:i lvxlo,(b d 1.0-mF capacioa(,bli l:v0xtor are 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 inductor, whatcpp fpmn2+ko -od:+0ywx1eg 8 is the impedance at 1000 p8go1+ :+cdnmp 2o-0 e yfwkxpHz?

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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 5qbxba5)a-h 5oay0q iis the phase angle at 10y-ai a055qoaq5 b)bhx 00 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 ,c aoqbm64;+p+j bkjq circuit with a 20-mH coil and 1.0-mF capacitor for a total imped jbq m4 ,bpqj+k;a+co6ance 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 resistohydu(z6 v.m2nw-2t iir and 15-mH coil t2vwi-6md .zu(y n2htio 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 o*1h (*la iiwrfor a total(h*rii1a o w*l 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 with a 100-kW resistor afd,ixizl:w*n(6c 0ipt 1.0-MHz for a total impedance o(zdn0 ii xpifl*:w,6cf 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF cap,w,ez9 l0 lclsacitor. What is the impedance atc,lw 9,z 0lesl 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kH n 9gwsamny0)5-str l8z for a total impedance of 4r wm)8 0n9 styag5l-sn5 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-m:) a0d0 z.8;v okzuap kpw 5w*4qgmpthF capacitor at 1.0 kHz for a phase angle owtp :00a ;k a)u.hwvk4dqpzmp* o8zg 5f $40^{\circ}$?

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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 tog28kgy qy.u ) jes;)bmtal impe8g.esy)yb 2j)g q; kmudance 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. m jid/shc kpb9/)r55p What is the phase angle5/p i 9r dmsb/c)p5jkh?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coilw9 lb5v uk3 u;nxa4c1b, and 1.0-mF capacitora cvbxl 3 wnu19kbu;45 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 r;auf9+:b(levs l 8r/ fjvx+k 66hdex yesistor, a 10.0-mF capacitor, and a 0.350-H inductor. The/(reya l 6bl;xefv:8kxdjh++uf6v s9 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 reactance 30 W, and an i 5l*9,qu3bbfki) hvx onductor of inductive reactance 30 W5l 3xh)* ,9biuv fobkq 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 50-W resistor,2ivj j hll.x/ g3vo-h; a 10-mF capacitor, and aj x j/v.;l3ihgvh o2-l 0.45-H inductor, 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 serji;8 abd8fq(b ies with a 500-W resistor for a phase angle of q(bbf;i88d aj $40^{\circ}$ 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 = 4;r a e .zv64lykfk3a0p9ojosssbd-a;+0 jon200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum j v9s3ksak. l6ro4s n4doe- b0j;zyaf ap; o+0power 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 circq .ex 08m p *mrchei91caiiw*piqz 06/uit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supqwx*zha8im/r0 p*mi6 ee19p. iqc0ciply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is pp6h -n/f zlc(-nkf1 a$63^{\circ}$. 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 ,szo sz8dr62 aa resistance of 30 W. What is the power factos6d r, za28ozsr?

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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 5xoiv98r5+7 l tx,kcvwk*nef) 0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conn+7nw *ckx9ktx vo vfli ,r8)5eected 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 frequencyld0ogi x9fvub6m uexn93mro c (:10e : of a 1.0-mF capacitor and a 15-mH coil in series?x0( 1ceog emm uf03unb:: orl9dx6vi9

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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 ser)qp:o h-*x kd)4ecpvdies with a 4.7-mF capacitor for a resonant frequencydex4dv)h :oq)pkp*- c 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 idt6pth+i t*n7n series with a 3.7-mH inductor for a resonant frequenct+it d np*t7h6y 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 t01 peg :bq bg3s08ztuplaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency 83gtt zub0:psq01 ge bof the circuit is to be 1000 Hz?

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