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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 unitst tgw*tvo d*6ai2.r*nr2 qph . of 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 r)l7hrxc.4a x 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 tlwv fxc38+,0sh+vht of change on the in0xcl ,h+8ttw hsv+ fv3duced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wirpqs,d5e 12 4 ktjg+*;wsnz: nkd hejs4e produces what kind o;+dq4nd tgk,* 2njszephswks :e j415f 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 cg5 zwd :3d- 7wggqu9/ xa nh,-cja3yxwire produces what kind of change on the induced xugnc- 3a q/x wd,d -:ggywac597z 3jh$emf$, 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 magn7 f1siuuub (2netic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induc93u,18gw 0pyae 2 yfi(/9t7 qh en2vovv qsezled current in a conductor will be that whi(v vsy,9 3qg/1 aevfeen782oiluw9qyp 0 t2zhch tends to produce which of the following 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 ,j1rayf07i oz bar magnet is held above its center with its north pole pointing down. The stationary oai07fz, r1j ymagnet 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 held abd9 d, vegzq/e-ove its center with its north pole pointing down,ed/dz-qv9eg , 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 magnetic field vector a u03boevy30 tpoints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fi3abt y 0ve30oueld 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 i m8,no3wxzzf0 )2kb gmn a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is thx8zw3m)z0mg 2kf o,bn e 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 nf5 e2 abli. 8qdf7w-8dz5uzf a horizontal table top in a region where the magnetic 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 the field disfz5l -f8qa2 eun75dwd8. b fziappears?

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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 lnf1 i(;icpcy7 li,z2yies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table 2c1 p;f,ciyi 7l(inyz, 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 north pole en;:c la /aunhgeu uur/h:y.bd7 ,to3hzj yc5 35tering first. As the north pe tu5 o//:; rucyl.n,3g5d 3uz cbh:aja yuh7hole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at const8wqy 5/ulc:.mbp uu, bant angular speed about an axis whose direction can be varied. In a region where a uniform mag., u ucp 8u5yqbblmw/:netic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated ai zmn91m)uzip 02g ievi,s+n*ks x9a2t constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the k si29nisiv,ezm i+10u2ma ) pn*gz9x 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.d0ruo ukg x27:l ;8ysg
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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 th/p+ mk1eq dhqt4kynni *99+ghat 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 mage1n4rz :hwjv,tj vf,f --)apgnetic 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 ykifp /2cb.g+ in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a sta+fby2 ipc/ .gktement 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 bar rotatb7 j c6ipv:ni7es 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 transform cx84qw0hzkgnls n -3k (s*y-ts

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions*s;;)iyqsoej )nkzqj.d9 ay 6 each second. The frequency of th)s;.z)ky*; 69 qdjs aqiyeoj ne $emf$ 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 devicmgrr32nh b;g5e used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devicedbjq,)zhx j5b9 kp+qd , bhg/. that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more lo : iv)8z k3vdniki r4wc:xk7z6ops than the primary coil then it is 8:nc z kr i4:iw6)d73 zvkxivka

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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 ,v) k htgc9-azcoil contains more loops than the secondary coil thentvzk,-9 )ca hg 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, thhu7 s6s-jrt/fe power 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 circui.p ) uy--l.vug tgyrnao z,.k,t,

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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 in9f15kdb y hih+ductor are connected in series to an ideal battery of constant ter i+1ybhkf9 5hdminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of c+cnx- lx;0a te70-g3 6pam6b tm hluhqonstant terminal voltage. At the moment contact isnax+b7he3 pg0x6q0mc thlum-a;l- 6t made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is2ax9a x9dlkhgv9 xw;/ 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 resistance R is connecteu f dw4*ru. n+ist si6xgn+.be3c50 v 5t;dvhid 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 battery. e**g/ q(6e i2eoy -mu9keel tkx lcu3(The time constant for the circuit represents th* -o/ki2 * ute u6(ley elkqmge39cx(ee 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 connected in series tolby+ gubobbk4g44v1d.m :1nm.n qur 3 a battery. The battery is suddenly removed from the circuit. The time c grmmqd vn+4bo4 :n 1.4kul.bb1u 3bgyonstant 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 units exc 7os(pyncfy,8 ept:

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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, the b6vg i1x4 6xmd1zh9iszc+g 8qcurrent

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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 pow3s7odd m cto:2er supply. In this circuit, the currento3s:com7t2dd

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what facton2+ 3wfa*wl ezd06z nkr when the frequencnla+*6zwd3fz en 0kw2y is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage hp m34i+fh;b hacross an inductor is doubled, the inductive reactanchi+4f hb3;mph e of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches l4r rgu v0gz:qq2;;tq zero, the inductive reactance of that vgqz r;;2l qu r40q:gtcoil

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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 supplyz7omiiis1fbk x 55yorrgn:1sh02u; / . In this circuit, the curreoisi5gn six1f;:ur057r h2 yz1b /ko mnt

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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 1+zgbm h xtwn7:9f.zzchanges by what factor when the frequency is tripled71nz9 zghzf.:+tmw xb ?

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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 1/a* z63hk*dd oopd,ivwmoz4 zero, the capacitive reactan,*vm*pkhzo3 461 /aiddz oowdce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voq:0wqp0yao* vs ab)t+ltages of the inductor and capacitor in a RLC series circu*q 0ay vt0p)sb:q owa+it?

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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 de d*;y ,z,.ngjw oxdfx*fined 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 impedanu yce(m/p9bc.ce of the circuit increases if R increases. When is this statement try. c ebumc(9/pue?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if 1ze.pyf32b m e$X_L$ 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 impedancyw3u), 0opq :zrvh th,5 kvq/t *6tcaie 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 thuzcg r vz;c-:v-/iy3j e capacitance both double in an LRC series circuit, the resonant frequency of cu ;-zrvzv jy3g/- :icthat circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circ5;c. lki w:oo8gsryz7uit that 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 circuit oc*trv 1x/,/p ;xmdol,o a(drys curs 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 maoipgoud gb r:ipr r 5796a:;(mgnetic field of 0.20 T. Find the magnetic flux through the loop when t9dmi:agrp bou67i;( prr o5:ghe 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 rau: ju ef ha9vnf;t6(sf.er-d8 dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane uv8e njfe -;s:f9rt6hd (f.auof 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 m1pj4felr em )gx h- rb45;fs0orc6g6m is rotating 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 field vector are b1mse4466x frjmgc );for5ergh p l0-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 loci4y5e4-rn on+m,t*c) m wum; qulh ;fop 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 coilti7 jwjpk)**c5d q5bv changes 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 6e.. ghn e;cbd5z0rmca square frame with sides 18 cm. A uniform magnetic field is applied perpendicularh 5;.n0gz.cecd6e rbm 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 2 6axjt 6bn+wk:jc7ijgz4 5fxwith 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ar;rfohqhlyoj; 2;xf7 /ea $0.20 \; m^{2}$ 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 ln uv83d+y :hdsocation where the downward component of the Earth's magnetiv+ y: d3du8snhc 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 lodyb)v95*pjg/es vw /d ng rotates at a constant angular velocity of 2.0 rad/s abou w9dbvgvpj*5// se)dy t 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 t mnohlmig, )3p z,v9(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 nzsk( wrn+ )hi*3n*u cof 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 icvw4vj :vvk+m;6fv/6o c;;xzo9akb kts armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at +cokv;vawc ;m9 6z6o4/j kvbk:xvv;f1200 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 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 , sxn b4v v+c8qtgp52nof 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 to construct a simplehed2 kcdy5so+m qz (i9; 4aw;e 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 area of the rotat+ki;4q95cmedasehzw (y;od2ing 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:o 2 9qgrfzk69xn0ftd 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 resistag8-v a3j x(bat-cfk1x nce of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates ndsdi6wa89za- q8eu c ku.f*1on 120 V AC, and when running at fu*6aeu1fdi88sac n 9 .qzdwk-ull speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected/g:id e hcf*/xu0 rf;r to a 24-V power supply. The operating current is 1.0 A. What is thf 0u;:rdcg*xfe rh/i/e start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V ,;61wi fcen :fa1 buo6fhwvw) power supply. The operating current is 1.0 A at full speed. What is thf,1 v;w:ibh un6f1 acw)6ofewe 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 avc :a.8q dzvq f0m0am2 24-V power supply. The operating current is 1.0 A at full 0mqz :v2am.va0cq fd8speed. 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 tqdjnh**-k15 a vnxd2 )ivf6x 6e4 zhyfo reduce 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 Attjmwq8sz -ma +1l8 9n to flow in the secondary. How many tu1m+8-j9n q ttl8zsm awrns 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:3 b67 2ijxbppvoas2g/d dlg, many turns are necessary in a 110-V primary if the 24-V secondxjbga d:p/si 2,3lp vg726bo dary 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 a2lf.1 qovj( nhyq2m4p 2000-turn secondary coil. If the current in the secondary is yq.mhjn 1( q 42lfvp2o3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% eff0qc+ vxt5u9ppiciency, how many amps at 2x q90uvp+tpc54 V 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 provides 7500 V at 10.0 mA+w.*oix .wgt2x0 nu de1aq(l8vm85 gonbzz c/ . The primary coil operates on 120 V. emdawxtzc u .8gi/ * 50vo81zn+(o2wn l.xb qg 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 h;oy9wvjdq n s/h or7t2998fnb ps;. 5y8b hloxas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primarof28;9t9y8qbxso;jwn .spyb9o75hn l/ h d vry, 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 3 :i707b. (wou iy;j5pxj oufhg00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present i oj.xwpu y f7j0bu5o:(7 ihi;gn 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 seconda:aam py0 pll;vd60:pn ry has 200 turns. If the input current at the primary is 100 A, we can expect the output current alm0yv lp: 60pa;:ad pnt the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2io2 knkr 0/hj:00 turns. If the input voltahr j:ko20 /inkge 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 xb 6hsjk85f7isecondary has 200 turns. If the power input to the primary is xb5fk87hsj6i 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 curreny(yz 9l y6j4 gx3)lreut 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 9rul4 ( y6)eg jxyylz3the 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 ste0i:y9uwef g qda m(d.7pped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find tdg feym: iq.07wua(d 9he 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 st3dj. gahmvu bef+c+5 7epped up to 4500 V by a transformer and transmitted through a power line of total radm5.3jfv ++ ugh7 cebesistance 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 resi5 ul m7;r(whekstance of 0.60 W. A generator produces 100 V e ;lm7 u(w5hkrat 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 long has a total resistance of 0.60 W. A h ),klivz*.npgenerator 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 p,z)*kil .n hvpercentage 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 lino1e xhxms81 /ze at 1000 V. How much less power would be lost if the powerohs1m 8x /x1ez 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 tra( i 6dpl fgma+f0a9ux2nsmitted 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 0.010% of the original powe6+ mf 0p9x2l(fadguiar?

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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 ju.;kg7lp d(can o*2wl*var4 energy is stored in the coil's magnetic fielaw(74adg2lv*upj. c o rl; kn*d?

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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. What is3v-qx/fgl ; gy this circuit's time constant?g lq ;xyfg-3v/

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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 vry7aaz h q+0bo09 f:kan 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 outlet. What is the peak currew2e;l6bts5;qp lh:nd 9 )te)skz1 jjr nt?

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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 ikg3+5jm 6ze zcs the resistance of the la53k+zcm6j ez gmp?

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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 peak09lq 3u7g/p0ccn aefn current through the rescan0 qpc9n 07l/u g3efistor?

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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-mr w:h) p7iy+aV ac power supply. What is the power dissipated in+ya7r:)piw m h 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 resistih 3 y5c;vlrg l(ig7-b i4ils0or 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 ag l;91 i3vrki) ka.x2s/aiq. dmm; doa 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a d2m g(2avn8x bouqj422ywl7 z de.- ob50-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 8ip,pm z/;cmg 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-mx s1ua 0s;t:irw5 csp(H 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 reactan0e 1wqp6brd,* snl.qwx :m+bice?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive r-y xm 61h/ .s:qhbn+9 robqbjqeactance 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 ind t+o6xif;bdc:+vf q/j uctor when 120 V AC at a frequency of 20 kHz is applied to vo/f+: t qibf;x+6 dcjit?

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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 cog k:.ttp.6h jilc3ozum-7q 4xil 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 r) k,px; mkk6rieactance of a 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 :re( 1evkae .wbm+14yrki/on have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 W6 * -4pkido:mldzdwy:?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 1u jf6 9(cz 1yr0ks3xwa00 W?3ux19ywjr kcs6f 0a(z

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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,ofbbqw yckrhah1/ :0h b1kdy 4 11d0f 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, 15c9ewbce mlae*3ul81it v2bv 8idd730d*uvr 5.0 W inductive reactance, and 10* i dr 1ca7l8 2 3vmw30vdeb8ubeecdlv5ut*i9.0 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 impehgjm7y4*p /j qdance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecte7j/*ghq ym4pj d 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,an,.lk/5b2tu*7iuo k)ph c z frr6a:r 20-mH coil, and 1.0-mF capacitorf: uai5kua b6).h/ trn,p*7ozkcr2rl 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 connectedwv 8me)vp+siiv( 1 f1*w5fa7eg4rmp j in series with a 20-mH inductor, what is the impedance7gpfr(ea)e1mjv4iv +w5w s f1m *8pv i 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 induc u2gyv7- p3 xu)b3sfpjtor, what is the phase angle )bsu 73pvu-2 jp 3xgfyat 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 g1ttu*rg-q 1e in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of1e1q ttrgu -g* 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 ser6r0y*rn - xbrpies with a 100-W resistor and 15-mH coil to-yrxbr6r0p *n 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 kvj)2sje 3nae/)g4 pqat 5000 Hz for a tot/qa vs)3ge)k j4e n2pjal 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 zbl ;p zzd0;lch13i1la 100-kW resistor at 1.0-MHz for a total impedance ofpl0cb;z131;lidzz l h 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 capacitor. What dg zhg 7eur3n39pve, m4ikt:9 is the impedanc3 ng49urk 7 ,vedhpi9 gt:3meze at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-msqx r(x(v5 ko13kv8 /lsgoum1F capacitor at 1.0 kHz for a total impkxv xoom8svkuqs/g( 1 5 l13r(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 nee,il z5+2a4, bvajdu,qczi vw9ded in series with a 10-mF capacitor at 1.0 kHz for a phase angle of v45w,jba azz+,i9 cuqv,2d li $40^{\circ}$?

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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 aqdzln4(r ( )feb:0 - esrt5gbbt 1.0 kHz for a total impedance of 45 0bqdz (tn)el:4r (g5b s -rfebW?

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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 wf1/wt a8mfgc;li eiavq,jxy 5)8,, izith a 100-mF capacitor at 120 Hz. What is the phase i qa,8tl jfwy ,im1fegc 8,/a5x izv);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 ilinlb, )-,/)o3uhni 7btlnx4kgda,uf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arebn7tux,)il),n ,b g/h3 dk ln4uo-ail 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 resistor, a 10.x+h28wu1z qdg 0-mF capacitor, and a 0.350-H izgw+uq8h2 d x1nductor. 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, ssc ue 1zvhof1+5*e s3a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connectez *5soefvsue13sc+1hd 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 contai7cc4/qn n/w fb .uti3ining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power n3 /i qcb.7ntwi4fu c/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 necessarw;- 7 rh8s ge,zicjx+lr6gw z.y in series with a 500-W resistor for a phase angle o8c;rwrl zwejzis,6.-7 ggxh+ f $40^{\circ}$ 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 = 2,v lhlo+xc6zrdi 1 +f000-mH, C = 10.0 mF. At what frequency should the ccfz0 h o1i+rdll 6+x,vircuit be driven 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 1 vqihqbx d 9:lv-zi: i/gq(g042.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-Vqii0:q z-: bg xld4v/hiv( gq9 power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is s,brl hs/s 8h he(xs5v (hzt,5$63^{\circ}$. 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 60k5ulb 5 +9pvjt W and a resistance of 30 W. What is the pj5t9v5p+ lubkower factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a serie5f(eb;z28 ig5i,z-wd0:gnmut l ngg d s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?f5,dg8 :gbn u5-i2d (;i0zlgzm etwgn

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH c9og* rgt 4ha3hoil in series? oht *g3ar4h9g

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitorb/woe7sf sxa, 4w(:d r for a resonant frequency sa b7od r:s,/4wex(fw 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 inductor g jbee727l6juq/*c qxfor a resonant frequency of 6q qg /lce2ebjju*x771000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W 2zxg.s q:ato 7resistor and a 40-mH coil if the resonant frequency of the circuit it72xszo: .aqgs to be 1000 Hz?

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