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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 magnetic bafj f-vr/n2m4u abylh1-6dx82dm 0d 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 thwz*jvfjh x, 04e $emf$ 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 coie*durqv )v1c09 .caxcl produces what kind of change on the indu cv cvcqr10)da9xeu.*ced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces )kn6ag p2pqk4vopl6; what kind ko) 4p6algk6pv q;np2 of 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 induxa26 l k,1oy96nsf7jbug.ye l ce7,uo9s1.ae llnfby2y66 gj kxd $emf$, 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 ..*.yi:z**yqti txizl ,wf oimagnetic 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 inducp qfw wt2/65oked current in a conductor will be that which tends to produce which of the followo2/wpt6fkq 5 wing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held a;v psr4w)t0y anjj7u,bove its center with its north pole 04v7u taj;pyw,) r sjnpointing 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 horizont(40k;:h jazuzeu 5/hbkbo y*f al table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fabh/bjk5a;(kzhu:0y 4fo z u*elling 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 xngp7dey793edr: wf-top in a region where the magnetic field vector points straight up. The magnetic fpe7 9 3wnrg ey-fd:xd7ield vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a l2p9su ,df zi,8 /ao ftblah;r,pdb29devel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this hdt,a/sop8azrf9ib bflud22,d ;9p , 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 horizo* rxw;mk84g zuntal 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 ;xkmuwgz84* r 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 evmcnp:ii i3-(-tkd/xz er-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circlen- idzi(ckxi3/:- pt ms

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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 l,jx* jyc1mxo01 rs; zmoop of wire with the north pole entering first. As the north pole enters sy;z 0rm ,1j1 ocx*mxjthe 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 constant angular spsz :ihwu. q*2jeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight doww s2ujih.zq :*n, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angukv3 (sc:)/p +qcfxghx lar 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:/sc cxx(vfq)g p+k3 h'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. 6(gmz*cd0ql w tq/u-jr hlg+1
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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 dgbu4*n ,h; dsan $emf$ 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 wqb*ram pvc.f7 )9:6lcw l8tj8l0 tjma magnetic 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 (oriep925 qg5a1h9uq nlmjynted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down.5 g9q nuh9mj q1pl52ya 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 bar x hc 4dl 0kt3h. hyhd09v-w0sjrotates 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 transfopm;bv;60)tatl: yzkt rms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. Th rdp7sl 22a4fs od6i.0ys5ln3 ae(pw qe frequency of the s0e6d l.3d on72lp(5w4r isaps q2ayf$emf$ 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 uibveu h g0(iz pf (0ne6,q*(lbsed 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 da/nhh - 5-:bt-sgkmxaevice 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 co 3jsjdh+gqu+m2b b3l4il contains more loops than the primary coil then it is 3+s3 dljub jqmbhg+42a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secont 8du z -h;rbafx6(e95n5ra zwdary coil r5f a w-dntz x;(abe9z85h6urthen 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 inp (ygx1/ yrguy5tk11 /n(fjxf7hki ge-ut

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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 3jy8lhurcv5n rgxyn 7ng 1vj4la0+; / circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of const8u(5 (.ffy6:w hf2ddq dghhanant terminal voltage. At the moment contact is made with the batt fu 2agh .fh8 h5q(:wddn(6fdyery, 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 ;hdy 1ua* hoc9g2k6 xmideal battery of constantxh2g9yduomc*16 ;kah terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and reph nd:j-j*:3 +tya untsistance 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 resisrx (qzqq ld9/nq6 zc/9tance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The ti r qe/njlgx+17.ou y0ame constant for the circuit represents the time require.aunyer+x 7g 1q/0ljod 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 to a battery. The battery 2,bqfzb7j4 br4 bd ps4is suddenly removez s44frqj ,bb2d bb7p4d from the circuit. 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 have the same m yf y2y7atkcyu(+-ewy;01i)ujak8 g 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 supply. On this circuilhpgr-vs)+ l 4v.p5urt, 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 chj wvt9v5y:7,x mm ,ksurrent,h vt95wm xm,kjsv7y:

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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 chaz*u / efa:zfayni*u/ f0(1uysnges by what factor when the frequenca**nfu 1 zs0i:/fyzay uue /f(y is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor,al 8 ab9jtu 5of;5ggf*op6gf is doubled, the inductive reactance of thag5jgf9 , fbtuo l6a 8a5;fog*pt 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 zero, thmdwr. -rp x mhbzc;fskoaa;x8k/ ./1/e inductive reactance of that as .p;8;bk.c hdkfw/romzx /xm ra-/1coil

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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.u ,e:1j* fkvsp In this circuit, the currentv pkf e,j:*su1

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reacto+ wmoa7g 5p-g v *k7vl,zg/cwbf; 0qgt-sgn.ance in an ac circuit changes by what factor when the frequency gg-tq a/vmb75k0l*;wzv,nw +gcpo o 7 g-sgf. is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acr- *ny;kc jzv(n2 bex4aoss a capacitor approaches zero, the capacitive reactance of n2kzb;xy(-4vne*c a jthat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor nz0u 6;eepm/2:c nlql and capacitor in a RLp 0em;cun2le6: /zqnl C 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 RLC circuit is dlm+1j6 e(aeyjefined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increases.;(ct ii u3majvl(y (f (ifv6 le,ja.p/ When is this statement,c 3ivfpf6mv/;i (ltjj(iu eya(.( la true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ifq,,8)6d;xkxin7 +eviuq knbu z 8fpt; $X_L$ 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 in6 un9tuvvfr:o q7o5m /creases 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 z1 rk0 xo gw+54ja*zzjthe capacitance both double in an LRC series circuit, the resonant freqk z4xgw zozj+*0a jr51uency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit th2tc5x ds:5xdrdwr7 /w gx1 iy2at 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 ke.h4at w47rrcircuit 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 (8k 7fpr 5;ffp 0n*sku1h cadk0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when t107sa*f5kkhf8p fkn ru (p;c dhe 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 rotatiju;0hp la ;(jy 8eisj)ng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetjlapy0 i( ;u) jsj;8heic 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. rnojk 2a( m(50ju,r,z5 1s5 pvjpgd8ke:cfpi10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetie5pnjjkr,(0( g rja ,5 285vpip1kdus:mczfo c flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single locza9t4 j05 qhyop 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 froyqwz 0w s9 yxlajj k7:74v5bq9m $4.0 \times 10^{-5} \; Wb$ 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 wh8; 4+ v:p kgmh wml++miw0(lm/y rlhfire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 v (8m; /mhf+p0 4lhlw:rmhyk +lmiw+g 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 +0- og)fwp-z /fo z 9e )leu96qsjfjmjturns 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 ,9s2wymt i. 8bkmwj/ m6faze 6area $0.20 \; m^{2}$ 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 locatiox6r 24dor)zel n where the downward component of th4re d62 r)oxzle Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bartarqal-hno , si;e.( 3 o+i1cf that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s ab ifo;o 3sq+nheia- c(.1a rl,tout 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 generatorq)llym2 fl,s0.g2sb h has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of are206lat ae s)uv8nb7 pfa $0.090 \; m^{2}$ 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 le 5jxb*ydah2)m ,2bdpoops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic fyb*5x jpdm22 bde),ahield 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 ofpp6 humg21yd0-vi u2 y 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 tsj 2 oenba8p(8o construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 8aoepj n28s(bT is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with up/ dguxad at 71u:zksb(6n91a 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 operate+)xdm71yml dq bbnr54 s 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 g+bmf: x 5q 4;x.wyqqphave a resistance of 6.00 W. The motor operates on 120 V AC, and wq+q5mf :yq4xg;p . wxbhen running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pox oui(w 8t0;9nt qyyb2wer supply. The operating current is 1.0 q(28y0btw 9t;xyu oi nA. What 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 is connected to a 24-V powqy: ht6ymo*j48t t+x ,1midf uer supply. Theq84ih6yx um *1t,tt+myfjo :d operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply7tnvgru , jljk-8wb: 0. The operatlv :gt0w -j n,u87bjrking 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 reduce a primary voltagej(h6mzfz;fme* 3a sk 3 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 ofr0 z2 td83ou)sk *ckjilo,:le a transformer causes 14 A to flow in the secondary.lo jdz32kiu*l 8)skeo ,rc:t 0 How 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 th i6nwmo-pxse ue8.1:ve 24-V secondary h.mwe1xp6-8no:s i euv as 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn + ): *bloeku scm vw6q*5yjbm7secondary coil. If the current in the +y)eb7s* vmm:jql5cob uw 6k *secondary is 3.0 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 pri ;++ 4bqnp,vp nmmb )i;gj) 1;vptabjcmary of a transformer. Assuming 100% efficiency, how many amps at 24 Vjijvm )++qnvbcbapg1b m ;np;); p4,t 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 m/9dzq: 5s mbhvm8;9dz0wuan:kvu nx- A. The primary coil operates on 120 V. What does the 9:v awbu90:dqk mxv5hz/- s znum8dn;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 i3d+fcf4( hc sets primary coil and 300 turns on its secondary coil. I+cf4(3csfe d hf 120 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 60 turns on its primary coil an gkubo .2g4c*cd 300 turns on its secondary coil. If 120 V at 2.0 A is applied tko ubccg24g.* o 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 100upyrs- 9ckb 6: turns and its secondary has 200 turns. If the input cbcu py96 :kr-surrent at the 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 secondary has 200 turns. rju0u , vqk02f If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to0v 2kr0uq,uf j be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turny62dl1s27v *n:rijhp 1ki afjs. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglaf*2lhdnis ir7v:p 6k1jy2j1 ecting 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 ususa 5g-udkr 1u5ally stepped up to 4500 V by a transformer and transmitted through d5r ug-s5k 1uaa 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 1ow)w0+d 9 jd1d5zsrjg 20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lined5j 1 w+90j rwz)gsdod of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curren;,,plfjz2th it at 120 V. The voltage is usually stepped up to 4500 V by a p,; z2ltfih, jtransformer 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 ;wztt-2 h6o*sa:g c*5ghb5lughqj ;tof 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transforh2:6gazc5h; b* 5gqu hj;otg *-wtsl tmer 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 lqx:imq/ y4 rk8ong has a total resistance of 0.60 W. A generator produces 100 V at 70 Arq 4k 8mq/:iyx. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 3tatxqdu) ta9) xd-q 16-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 aq-axd3xd tt1utq)9) 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 transmitted on a line1uad, : dvu0xw with resistance of 0.60 W. To what voltage must the generator output be stepped up with a trau vadd1,0 wxu:nsformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How z1vgary 2si)*0fp a :i4 ntmw6much energy is stored in the coil's 0pma1 s 4tn zvf)w 2igiy6ra*:magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is u4*of wifeyc7pf9)du 9 ou5+e this circuit's time cone979uic)4p +u5 fff*doowu e ystant?

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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 cirp d* 5,4sijznvcuit 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 abgs*gon;y; +l:3yjn ) vs joy. mmq;0r 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of tzxi6 we:m zqqr9q8 +m87,uxtfhe la mrzu+mq68q ,8 w9zetf q7:ixxmp?

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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.z2imu0 g0hv 6n What is the peak current through tinz6ug2 m v0h0he resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power d0+5prb,n0 tiqd z o6uyissip r0i5qnyu0+o zd6b,ptated in 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 50-7ql7zdfixsm* 8n 2lqw tpn +6(W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 508wd hbcrd*ro8/x 1qq+ -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 50-W res b8gtjd1 sg9w6istor 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 inde4 s ibog+1fep*4lkq1uctor 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 reac6bvr1)c/za:fw kw7pp6kqs wgd t9 -9v tance 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-mml m7 m n+39.qk8titwkrwu5h*H coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10v*0dyu7q ,; nd re.pfs00 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 1dx0*s5a+h udglhf,7zl/ x,xu 20 V AC at a frequency of 20 kHz is applied u50l hsxx /u *f, axhzdgl7d,+to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V8kvu xu8k6-pwuxz; i., 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 ca6b at2 blayww6:3nfx:pacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W ofwoukf:q3g3 .a 8v bed+ 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 1zwd .lz )x-na(0-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 c)h9s vfw0d/ uczn4br 6apacitive reactance of a 0.010-mF capacitor be 100 W?bvzuw 9crf6/0 n sd)h4

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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 0.0 5jx kj dohyb.(ng.;ru lg1e78010-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, 15.p szg6,8x za6p0 W inductive reactaz gpp 6,axsz86nce, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1 nd;. 6u 2byhfdfnzb4h7;e(u e500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conne yhbn.4dufe n 6z(fh27eu;bd;cted 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 rp+lc* 9+mkny ; d:ogn1.0-mF capacitor arep*n;rg++y 9:dmn l koc 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 connectel)h 7e5bxg7r, f0v vbod in series with a 20-mH inductor, what is the impedance atlo5b 7b7rh) 0ev gvxf, 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 2sn 3uj fhzaqe9; x2hqm8 e903y0-mH inductor, what is the phase angle at 100083n hy 2fheq0 qja;3xe9mus9z Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH co +c2 pkgaki2)vi)nl2vil and 1.0-mF capacitor for a totalkpa2vinkg) v+ 22icl) impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistodk *9i8g+xhxhr and 15-mH coil to get a total impedance of 110 W k9x dh+ih*x8gat 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 uc7e31ssd zr3total impes13 ucezrd 7s3dance 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. +-zf a8zm1ule0-MHz for a total impedance of 150zm+zue -l 8af1 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 capay dmjx5;-d3v ocitor. What is the impedand do5yjxm; -v3ce 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 win 9be9t rr35eyth a 10-mF capacitor at 1.0 kHz for a total impedance onrbry3e9 9 5etf 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 nsb(-l-qs9/ek* zkgxv1k4b1f* g u eyneeded in series with a 10-mF capacitor at 1.0 kHz for a phase angle o knyb--bvf*zkgqsl9g1* 4e/exusk1( f $40^{\circ}$?

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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 serib2y mxs z6-nx0lttl *5es with a 30-W resistor at 1.0 kHz for a total-6n5zmb2y0 sxxtl* tl impedance 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 ik-hejd -2i28l (bzimtn series with a 100-mF capacitor at 120 Hz. What is the phase anglej- b(8-k imhtiz2led2?

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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 15 1kqimf- uh;u400 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ihmq uukf 14-;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 resistor, a 10.0-mF capacitor, a-0nui(mom)1 zg zok+ 3g qnod4nd a 0.350-H mzg3 o 4- 1i0 kndguozn)oqm(+inductor. 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 reactance 30 W,88um xlixz;n. yz0,uc and an inductor of inductive reactance 30 W are conn y;mcunx8xz0i,.8ul z ected 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--m1regrk2 6ugW resistor, a 10-mF capacitor, and a 0.45-H inductor,1 k2u egr-rm6g 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 necjk0xahids gn/14y +4 qn/l8edessary in series with a 500-W resistor for a phase angle oneh4 dg/sq0j n8 l ak/xyid41+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 : /oepk kdrt) 7(:4hjpail+q lhas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to hql :hep(7+doktk) p i/:rl4j aave 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 circul0;il1pdmpl4guq as2v,)o p- it with 12.0 W resistance, 15.0 W upo;alq0p )psd-v mig21ll 4,inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC ci ofv*1wy- 4 jygcu ii-s5sy7)ircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30c)rn20o1rx j:o vp v4g W. What is the power fao4c:p1rg 0ox)rv2 vjnctor?

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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 fact(fq/8f7t g pba 6az3z/afo4tl or for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H in zlp7b6taa/f3 ft/a4fz8(goq ductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a j+nd++rat4 x+ 3etpq n1.0-mF capacitor and a 15-mH coil in series?3 qn+ +n+jx4tde pta+r

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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 ca5v t6e*nlwn2yp w;pe ,pacitor for a resonant frequency of 10 k2w5wlnpv epny; ,t*e6Hz?

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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 uvjee(mkxyj, 6k2w x.g4*i* kfor a resonant frequency of 1000 2*g .,ij(vk4*kkexey jxwm u6Hz?

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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-qj7bhn twc3i++g fi:va,2 b.lW resistor and a 40-mH coil if the resonant frequency of the circuita2:l 3nf ,gtbiw jc+b.hi qv+7 is to be 1000 Hz?

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