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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 unitc-d6mng: rh +u:)vgd-mmrr 5xs 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/sb qaum4* q1j 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 i sm,b4hd3x2p5yasf v8n a coil produces what kind of change on the induced m3afbv5dsy ,p 2x48hs $emf$, 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 )* ldh*r3ngatproduces what kind of change on thagnh3**rl d t)e 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 pjh q52 xm3t+foop. *jyroduces what kind of change on the inducedtm* .jf5j+o3qyo 2 hpx $emf$, 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 fieldqjhs q9;(m4-legvpb2 uw7m .d 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, 2jrms/e2vk nbqk s69ui 5g) 8ythe direction of an induced current in a conductor will be that which tend 9i/k25yr vb gs2)sumen qj6k8s 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 bar magnet is hel45ctb39+o:q sn pcyvcs(1eu kd above its center with its north pole pointing down. The tp cscu q3159cn:seo4b k(vy+ 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 n0. w fwn(rz3v)ay) vton a horizontal table. A bar magnet is held above its center with its north pole pointing down, t.vay()0 nr wvn)fwz3and 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 magnetic4 /wll/yflrvdlc:; s8 field vector points straight up. The magnetic field vanishes suddenly. When viewed frs8cvwl 4r ll;/dy /l:fom 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 l;r(+6d0 p5s,wekn uyj2b hl vnevel table top in a region where the magnetic field vector points straight up. The mjkp br,5n6s0dun(2hyv ; wle +agnetic field suddenly grows stronger. When 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 horizoca/2mwqrrh r. ( a2uj4ntal 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 i hj2ac/r24mqw .a(rur nduced 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 liem f (5flqrt09ls on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, tlm5(f9r tq0 flhe 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 enter bdm:r94zuy(ring first. As the north pole enters the wire, the induced current will be (as viewed from abb(:m4r9udz r yove)

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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 speed *x nwuoe) of6.about an axis whose direction caxe*ufo w o).6nn be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speoa/ed 1/p 2nyved 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 looa/ 1/n2veop ydp'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.fw*p ;7 kj/tes
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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*9 wusyo/bpua03y5 w/v(8zx bdat 2pq 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 vb59xs9-6 nw c)pbmic;3sttj 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 (ory2)hb; i pr4soiented in the east-west direction) is moved northward at constant velocity through a magphi42bs o ;)yrnetic field that points straight down. 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 rotates at a constant angular velocizl d4())zd bmmsz4q)rd4 xatddzm7;:kuy -t,ty $\omega$ 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 trc*+ q84wty7qy*9whmd frr( laansforms

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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 secon ab);r9l8sfzr g(, jbdd. The frequency of the9rbs b),zdf ;(8lrjg a $emf$ 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 usehx(q )0;* nh ejmzvyu e8v n3,bt,nxt.d 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 dr efj1(pb,dlnq214qv evice 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 contain+aakr*ibkd+ed0x4: ut+q k m;s more loops than the primary coil thetk bd;aq 4uk*+xd:+i me0ark+n 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 prima g.onf*zga7aoa wbl 1-:pk0w5 ry coil contains more loops than the secondary coil then it isnaopw g-ao70a :.gl51 *kz bfw 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 powerj1z. bsydbmka0+1yj 6 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 cizdpgxo:v c6*))gafynxk 37 3prcuit,

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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 serielp(-4 3rclj(inaroa3s to an ideal battery of constant terminal voltage. At the moment contact isi3rrj3 pcn( a4(-la lo 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:gl nrx9b x+9e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltalgexnbx+ r:9 9ge 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 re:v4 wa w*,fip(qqi )y4 upq+rxi )bau/sistance 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 inductlkmdz/ 8em 1j pq4))gvu 0u5ujance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time con;m4m :4m cbmvjstant for the circuit represents the time required for the currentmcb4 mm;: j4mv 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. They3y4jatu sa 4gvs b jq0q9-8g3 battery is suddenly removed from the circuit. The time constant for of the cba9yy qqvs033g- 4 jasg4utj8ircuit 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:0mftv tpqs1z4:/v lo 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 q/g/xmy+5arg04qjg i an 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 connected to an AC power supply. In tsb.ev,pa r.ntzx+a- +his circuit, the currentetb,.vp.-s a ar+x+zn

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactazk+5u.jfov )m t f0.cwnce in an ac circuit changes by what factor when the frequency is triplecotf5w mfj+uv .0 kz.)d?

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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 inductorsl-i gc)q (ltq1hh 9:i is doubled, the inductive reactance of that -iqg )til 9:l1 schq(hinductor

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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 appr 1yy m de1fm8h42c 3w5h1psouioaches zero, the inductive reactu1d imyh3hcp wf21s5o14m8e yance 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 A8(ka pp/gm4r tdk4o. qC power supply. In this circuit, the curre/g(4rkdp 4ot8kam .qpnt

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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 circu6:kkrpde kac(hrkfi67d0a-e3 -: prxit changes by what factor when the frequenp:3 -k: er6cdkh-xkpae rd7fa6i0(r kcy 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 across a capacitor approaches zero, the capnfsg 3p)s v gy)+l7e.lacit.p lfgnssgv+7)y )e3live reactance 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 voltages of the inductor and capacidyz q1p7x;jd+h:r( (uaa: zjqtor in a Ruj p(y+7dq1dx:q :haa (rzzj;LC 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 defined as h3 l pp8ujq3,dx 4f7)vw s66e9hsulhw$\cos M = R/Z$, 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 w.b);3ebxb2 ;smudg cof the circuit increases if R increases. When is this stag.;2;cw u)sdb e3 mbbxtement 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 iq 9 ezm/eq2nq6f $X_L$ 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 serie t7lhupin /,uumvwc*s i /(-y)s circuit. The impedance 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 capacixj m): j(rvn,pi tu5sdqg o0:2tance both double in an LRC series circuit, the resonant frequency of (q)dx jn2s5:,m0: rpiugtoj vthat 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 circ(,h-widiyu 6i eu,) y/c hc9g,ajhpa2 uit 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 ov f(uu6x m bchd;)5l+lccurs 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 field ofaefg)o 8pdc 90 0.20 T. cp0ogdf) e8a9 Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiusg 2*) q,rwbhth 0.10 m 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 m*2qrb),h wgt hagnetic 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 rotating 1/a6td4q,d wgik 7kuc in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whencd/7 wgatkdu6k4q1 i, 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 adjustxtj+mtt k+az+0 2i6er able single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chazd dlj q/rnl2q+;d4c6 nges 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 squs mma3tuo m,3)mlkt -6are frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If thm- ,la3t)mtom3m sk6 ue 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 areatc 8dkvr:8 7rq 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 aqps;)o 5jr- rknd 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 hori0ab 6-lphqii2zontally at a location where the dop-l60qh2i bi awnward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocity87t0 dp0biems yl:d w) of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field oftwmsily 07bp: ed 0d)8 $5.0 \times 10^{-5} \; T$. 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-sectional 7z k:*7uvhqrhs4 7kig 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 y j c5i8dtwh r+94e)voo9plkq)* m pi)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 loopx/ ip du03rizdhws0 3) is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which0ph 3uxrwi izdd/ 30)s is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ofor8g qo.k8 +7ront)uz f( 6dwi 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 te5ym3 3ek6c bmo construct a simple AC generator with an output of 12 V maximum when roec3k y6e3mb5m tated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum ah 4zy8 d2;a l8(libhf 2ox)ouvyh)m: $emf$ 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 mg6jod7(e5 bxklw54fhq,z 8 ogotor have a resistance 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 Wqei5;y; y5(+la s1usxk/e z is. The motor operates on 120 V AC, and when running at full speed it generates a bxkse iy5+z ;s yq /5eu;1ias(lack $emf$ 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 re)j7sy)d , zkyeap;t ;asistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start) ;y p; 7jak)sydetza,-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 resis6hag txj*yf117 6zl3 tgxz0putance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. lt3* ya61x6 g17pt j 0zfhuzgxWhat 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 6.2d4lv r)lj9 hj:v l9hwr/bwk90 W is connected to a 24-V power supply. The operating current is 1.0 A at full s)r 9h92l/jwvv rb9 :4hlw djklpeed. 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 pv8iiog2 u;7w is needed to 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 tk rve7v p 66acv3d5vyl6 ahz.:ransformer causes 14 A to flow in the secondary. How many turns ah6yvp5caa7:d ev. 66 lkz 3vrvre 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 necessa. ha6mgrih;z7ry in a 110-V primary if the 24-V secondary hhz6h;i7ma gr .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 ci+q ii.f 1r-s m94 zbkop9g0lkoil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what 9ki imbl+ psr0f 9gi4-1oz.qkis 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 8:v35vnshu3rzil; 1e n2i :od q)mwlrprimary of a transformer. Assuming 100% efficiency, ho1 8:iv;hud nqrms:l) e r 5nz3w3ivlo2w many amps at 24 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 y ggqjy98.y/f 10.0 mA. The primary coil operates on 120 V. What does tgyy. fgjq/ y89he 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 +yi5s )3 zus4abmn si4,cp+v bon its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondarysc mas45b3+n),ziu +byi 4p vs?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on .ob sb8;fh af01 dzd+xvub 8;j8 r(gfzits secondary coil. If 120 V at 2.0 A is appliedsgb0fzb;.;8d+h vzjfof8uax b dr(81 to 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 transformerhm;i86t/ wa go has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we c ;8goaim 6t/whan 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. r, f/k :vm,oqwatem2 ) If the input voltage to the primary is 100 V, we can expe/trvo fq:wm2ma,k ,e )ct 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 y qm/7;4zbnpm *bub)i5 n 3rzaand its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the r b 4zinaym*)3qp5m7 nb/uzb;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 stepped uw8.oqw (lykv fvie26p9 o+sq g; )lu3gp to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of tu 3) w+ v9wqilv68gg;ouklofp(s2ey . qrns 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 volla5) f l wfyz5/*iyko1tage is usually stepped up to 4500 V by a transformer and trans* 1al5)yio lykfzw /f5mitted through a power line 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 current at 120 Vsiv94wrx yv9 8. The voltage is usually stepped up to 4500 V by a transformer and t8 w9xiys9vv4r ransmitted 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 k049muar(qf un m long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to he09runq f ma4u(ating 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 +1l; 9m ,bbkjn;zoh 9livx(waline 50 km long has a total resistance of 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 is lost when the transforma+;b; (xo9imwjl lbvz ,h9 1kner 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 5tuis,m0-;3i d2hfmx/ d-xk ulb xr;iat 1000 V. How much less power would be lost if the power were transmittb hutms-m fiu3xxid 0- dlr2ki; ,x5/;ed 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 atd 5-uv-l vo3qt 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be so-l -3 qduvv5ttepped up with a transformer 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 moqqq0 6qu+ads.c0:xam9 id- much energy is stored in the coil'6q.q m-qda0omd0qu x+ ca:9s is 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 b)*pykr/ lc3f resistor and an 18-H inductor. What is this circui*p3) b ck/yrlft's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms vb . heu/2sxpy0oltage 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. )fudyp*t5kqn g*bh . gvd ;.7cWhat 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 t,z/ubifyqzh0.z1mt l9q3q, c0 5 uzjdhe la051 zqz q3cjl0dziu,u,fq hbzt. /m9ymp?

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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 cobwx;92y :ji2h0 47 i0yf0hoalgd irrxnnected to a 120-V ac power supply. What is the peak current throughjdygx92 ab2x;oih70 i yifwh0 4: rrl0 the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac poweo7 eswfl8 2c+br supply. What is the power dissipated inf72woe+8c l sb 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-4i pt iv7v(fe is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W p;ijx)4armu0 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 v4.d4wzbwlz 7 eh k:p;50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactanc8o+ put0gi+ eje of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 100+7 awro 0vydsk797et l0 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 inductn8pv/qt8+ li;+mdz xtive 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 necessa8mdxryr+d lu 366.481ium yjhqc(vo l ry 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 kHz i)am ,yz4up0.vipgg l r3ju+2qs apmvlri4a+gjug32z 0 up.qy) p, plied 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 2rh y 2cfq; cp3u3x**dn.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* ms(q i06ctzm+ iyvyfh 3;y8v 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 have 50 W of b q k jf)92bmg,uc du,yj/30h-zy9uw4fbu c2jcapacitive 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 capacitpdxh63wsk+oh9nz c3 4 or have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-jwq/x pq( (jb9km. y:emF capacitor be 100 W m.q(y/wx:(9kjjep qb?

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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 throug z9-pab ;vsk3b bfm+1eh 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 resi0 ytx5df nc,ugvqn;+.stance, 15.0 W inductive reactance, and 10.0 W capacitive reacyndnqt.f5 u ;g0,xv c+tance?

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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 1z5 om,:;ykxi p00-W resistor, 20-mH coil, and 1.0-mF capacitor areo;kz,i 5: pyxm connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, ah9:f(de:g5qxqh2 /pxft40e f4 kj mxtnd 1.0-mF capacitor are/: xftem(p:4h kqthd50f2jxq x fg49e 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 connmw5 -0ywf y2)1ntcqyj ected in series with a 20-mH inductor, what is the impedance at 10t 1052f-y)w qcywmynj00 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 induceq0qx b lpriy ,11x-i8tor, what is the phase angle -,q r ip18elxiqx0by 1at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF ctyk ov.0o::1xq apx0mi(t lv :apacitor for a total impeda0qplvox0 x :iy. :(t1k:a ovmtnce 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 r:, tdxuxo:qcx)x;myi89 ew bg+80 0lwo ,tih pesistor and 15-mH coil to get a total impedance opmx:t xo+i0c )te,y9uh8 digo,wbq; l 0x w8:xf 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 50003 ;cwb a9 ld9,sd73cuq-byoij Hz for a totsd 9aic7c odjb b3 ;l3y9uw,-qal 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 at 1.0-MH mlhwf9.. d8hp9,eqjlz for a total impedance ofw,efp.99q lld .mh8jh 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 7kcc(oui8 g4.g o2pek a 20-mF capacitor. What is the impedance at 1007e.iugo p( kc2k8c4og0 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 b9jjp y9/) advkHz for a tota)9bpvjdjy /9a l impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mi:oben*9 cb./wqd *vgF capacitor at 1.0 kHz for a phasco. nqbevdbw**/i :g 9e angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed iqyur( 9nk9* ti3z.qstn series with a 30-W resistor at 1.0 kHz for a total impedance (.qkn*zr9t q uy9 i3tsof 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 ib2 b 6 jbxbx+)zgsi)k+h yf3r;n series with a 100-mF capacitor at 120 Hz. What is the phase ang))big sh;zb+f6yb3r 2 xbjx+kle?

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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 100-9ddbmt 7q47eb,xn/y b W resistor, 20-mH coil, and 1.0-mF capacitor are connected tm ,x/b7db4bqny79 edin 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 k p0t3a)cctc*10.0-mF capacitor, and a 0.c)0k t3p *ctac350-H 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, andn7.n ( ;jrl.8yr7aucrcih1cu an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this ci. uu8rrlccnj7y7ai 1h. r;(cnrcuit?

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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 fon3 .(rp d.ez7v j .-awdcqx;abr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powew.nap bdzqe xvr3a 7-c;..d(jr 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 series with8:q3x )iruw;ia lqc0i j,sk;o a 500-W resistor for a phase angle ofiora3 xi;ku;0wcqj) ,q:sl8i $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what freq6lrv-yjaihg x)m un 1+c +5(cquency should the circuit be driven in order to have max1 xg -cqy)jh+ u5rm( avli+n6cimum 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 9-tll jobcb :mc:b +8p12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaci b l:cj9clo-mb8+:p bttive 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 cir 5zm i6g.dmyq agv;:c2cuit 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 lm+yl18qw;b3 qnrmwek4ei6 5 an impedance of 60 W and a resistance of 30 W. What is t416lbe ;kq3+ iqe8wwn m5mlyr he power 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 series RLCqx czel:r dp, 6k-n4jwc0e( .g circuit containing a 50-W resistor, a 10-mF capa.-(lkxqgdw 6c r4,ce:pnj ze0citor, and a 0.45-H inductor, 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 1.0-mF cap1g tgl*b 1pe1-zgc;c6ez hzh1acitor and a 15-mH coil in series?c g;ct1hphzz1b*ez1 le -gg61

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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 with3e( ey(7 c+d4qrt-+d1qnmujxq1 yw pi a 4.7-mF capacitor for a resonant frequency of 10 kH4qcq+ywpt (-7q e1j (dmnudi 3y1rxe+z?

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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 for a resonant 0jclkgf9 -1zjfrequency of 109 kfjcgl0-z1j00 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 9a udv sejb/*zct5t)k:u (fb9must be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is t kuv* b cbz e(:ts/9jdtf9ua)5o be 1000 Hz?

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