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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 flux exyll um(v4;ibwfe* 7 j2cept

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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 inductiot71rh/acm7xs n states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produvlve3o t 20stcu 9 z ,+(in7gnjyn)(sxces what kind of change on the it vzssjn9n 2lxc+,nteo30)v ( gy(u7induced $emf$, 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 l q7bit:e k4xj9 nhcv.6oop of wire produces what kind of change on tbh4tvnk. cq 6 xji:9e7he 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 produce6 gts2ftl**hxqi 3cy,5 tho8 qcwve+. s what kind of change on the induced ccef2 tyvxqt53hi+6hs 8o .*wqg* tl,$emf$, 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 fiexcn25jp hv (t.ld 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 induced current in a con*)bj zqy(p 2hdductor will be that which tends to produce 2qjy p*d()zh bwhich 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 bats.wiyi01i5b ( ye7wtx*p-pvr magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abo.i t7pwvy5(-wb 0iysxp* iet1ve)

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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 fla c*s p4(6mjvz(voib0st on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and releasemp*(vi 4zc s6b(so0jvd. 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 fixhma9+k; do .xeld vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inducemxh x+.;koda9d current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic ficc nnfn , 1zl5/x+ialf,q-w4meld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of tl,,qxw-l4 cfcn /a5f1 +nnmizhe 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 hori1d8oi306z0 snmasc axg0ns .zaaw *6 rzontal 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 iz60a*ass0goizmnn r a8a1 w xd.036scnduced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries anv3kx jif+tm;(2x v, mg 5pcc*l ever-increasing current northward. Two coils of w 2g3v ckfi;vml ,*+(mp5 xtcxjire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the no0/ o yk;cz*kpkjpr y56rth pole entering first. As the north pole enterp6p; zkc or0ky/jyk*5s 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 constant ak o)ly u(sm,h,v stm2:ngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatiom(sohyu2,t k):ml,svn of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an t c8rdu +*usu1qrsy:+axis whose direction can be varied. In a region where a uniform magnetic field points straight dowy1: u8st d sucr+*r+uqn, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.c3s d1ky2wl o-
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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 thatk;ker4p6hc ,fco*; qb 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 magnetic fir8k5 * lcfd2i7xgdt s 2fp;8;ljojf;m eld. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at czcwz- l wbjq 7)jk4h.(onstant velocity through a magnetic field that points straight down. Make a statementq 4h )lk7jb wjw(z.cz- 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 veloc n5qg*95nnqx7j uho .qity $\omega$ 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 tragd3gb31d2 hp ptxu3nh )3z,d hnsforms

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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 eai;kuai v r-(enrk o( )ziv6-s7ch second. The frequency of tvev-a -(nzu6o(;7rk s)ki rii he $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tonpn71: */;ta;eg layartix u7 dx; l7g

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thsg1yc/f s9 x8k4.mvom *mol) nat

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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 loops tqjf -m)vnjr4 fvj 5w(+ ob0js*han the primary coil then it is asjj bn0(f mrw*vj-+o45qj)f v

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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 p h6zdh.o*wa/than the secondary coil then/p wah6 zoh.d* 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 po5cs.fq3 gp ,m3edhc jvm)a91fwer 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 /, kxcyckq8i8t,

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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 connectn7su z;x (6fz-ojl /tjed in series to an ideal battery of constant terminal voltage. At zzj6 -s(ux /;ojnt7flthe 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 wsy9.ait.aevb3u(e * ideal battery of constant terminal voltage. At the moment c.( e.i*t9y3saewuvba ontact 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 ux g /9;casp9zec*cnt.4 ed*band resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resista.36r-wnpf jtknce 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 t: o0.1yvvvg u))d*p ypy5nkzn ime constant for the circuit represz *v:0 y n5kdp)vyovn1u.g )ypents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductjlj47 (( 9 tvhd 52bybjf5ecmyor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requiryfbj5ydl (c jv 7ejm t9524b(hed 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 exc6(rnqa k3/v ibept:

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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 pklcywh9gv5tb*jw5 7 2 ower 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 this cibah6gu+xw s8f )sm9 s(rcuit, the current()b+ fsamgux s 68sh9w

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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 factor whenl q7f m(f:p+br the frequency b7m qf lrf+:p(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 is doubled, the inductf wc/n3s4 6u*lvb3lri ive reav3 3l srfwcbl 6n/i*4uctance 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 vuwqk,+ 6x3iwl oltage across an inductor approaches zero, the inductivewu6 3qlx+,iwk reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC powert c+m6ii:+h1 r vsh1wr supply. In this circuit, the currensrhcr6 +i1h+1wmtv: i t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactazk9e8*,rce, uovd j:mae,qd6nce in an ac circuit changes by what factor when the frequency is tripled,cm8q69zk *j e,,r oua:edevd?

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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 volta0f.esomml3) m ge across a capacitor approaches zero, the capacitive react3s )lo mm0em.fance 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 betwt6+ zkg0i+ :pt nk1urwx:y,bheen the voltages of the inductor and capacitor in a RLC series circu,r k :pxyt 6iwzn h+b:10ukg+tit?

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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 defifxjpway ,7h- 6ned 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 i ,o x f+2pxxumyqz4l36mpedance of the circuit increases if R increases. When is this statemen o,fzqp2 6u4m xyl+xx3t 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 iny67l.z +cu /qc+kifibcreases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increasejr gqk+5* * 6p)th96vb-t.lrgi ipceks 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 capez5) 5r)e,da zkgihol w97uw- acitance both double in an LRC series circuit, the resonant frequency5e-l5hr9a,ikdeu)wz z)gw o7 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 that is driven b*isruxud5v:0u6 (n osy 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 serielzuyd lye r q+dr7, i/t,ot1,7s RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fieldx fvova2g8qaz(m j);8 of 0.20 T. Find the magnetic flux througg) 8(vxa8 vjz 2ao;qmfh 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 radiqoa:i51q -c npus 0.10 m is rotating in a uniform magnetic field of 0.20 T. F5qinc oqa:p-1ind the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 +d:rpmkvl x08cgs*9a m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through thvapcrldm 0s9 kx:g*8+e 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 adjustlbhg a vf6fhol o- 1tb16ay* kc*+g+.xable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from hsqz3 0 +:h( oeosxxg/$4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sidetvv,oh :h ,5 lrh(q8,gst*xc ys 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find t chvv :*qhs,g(l t trh8,,y5oxhe 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 wd 8i *+led(tbcith 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 area cp9k v i3b7/wkufv/2y$0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where ther 3; lxiq fuq6oc gdz7kv ,u6w*h.p,x0 downward componenp ,0izf*u6u. ro6,k wdh7 gx;v lcqx3qt 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.qurj)o4qq3fu zlu+*e ta(dmgr 4+e: 90 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field+urlm qq3e:uea r (ztd4j) ugq *4of+9 of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 l/ -p,fbbh 9j t)idi(6 z1;n:nqb jlvxloops 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 t*gapgm nbr3/vs+ox i38 .p .hmsh3o*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 a0w ; a(,oq9 (eca/rp,ik oqlou+egw4its 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 ko cal /(04; e+prw ,waig9auooq (,qeuniform 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 of 100 turns of wire of eb6wl:6 qt/ auarea $0.090 \; m^{2}$ 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 simple AC gekql.5j8w)j *jgqczl)9. w)8l x immulnerator 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 rqjcm 9)5gwlm j8i . zjuwl* )lqx8kl).otating 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 maxiwb60aibny b1h:9*nyacy om 6 9d;id4 amum $emf$ 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 .suf)9xwqe/2id, .rbzf t fz2b6bb 3 khave 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 W. The motor operates on yvz hd 6zsx::4evqk0pf a*1/n120 V AC, and when runnings*qfye: khx/ v6z:4zan0 vdp1 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 p8 ws.dm9mqsbl7v g9.s i30rvg cf1:rhower supply. The operating current is 1.0 A. What ibrm7df1v8:9.gsvlsq m s.cwh0rig 93 s 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 connecx3//.kcn nbyf-- ae kyted to a 24-V power supply. The operating current is 1.0 A at full speed. Whatn/ka n/yby-k c3f x-e. 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 connecte7( hpeyp1xoa mrs p8-/d to a 24-V power supply. The operating current is 1.0 A at full speed. What is the b7sy 18mrp-p/(hep xoa ack $emf$ 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 transformb4hn92 vsr cf2er 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 t 9sz(pxsb4wy* ransformer causes 14 A to flow in the secondary. Howp9s*yx bwz(4s 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 t2rdy *dsy9. bn )yh9ah 9pxxxq te/z 0e(y/uz6he 24-V secqrp9(nx/ 69dez .)htxadxy yeu/2y * 9yzhs0bondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary 9qqt2 /n9wl6+xourwz coil. If the current in the secondary is 3.0 A, what x+ tzw2w9q u/9 nl6orqis 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 thcothyv7ht7j yg 2tf34cbq4a,-3mbh .e primary of a transformer. Assuming 100% efficiency, how many amps at 24f 73h23hcty 4tg. bm4ac y-oq,bhjtv7 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 pr( zbn,xur+x*u ovides 7500 V at 10.0 mA. The primar(x+u xnzb* ,ury coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on it (;hrm+cj rsmppqs s 5(1f8c a5nz7rc8s secondary coil. If 120 V at 2.0 A is applied to the primary, nrr8+p(m15(sqz;5ra cc7s fc8h sjm pwhat 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 itsoq *qe;of-x1.j px)q)r tlgi* primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is;o)f-o *q.q 1ip)r xlqx*t jge 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 h dn,ukes 3fvy8.oyqwr+/7r 2aas 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we. /,waes2yq8r3y+ud on k7vfr 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 1b4md2gxlw t)m,nx( hits secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secoh nmbdt, l2x(w1gxm4 )ndary 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 transn7f-q ci-j2fwformer has 100 turns and its secondary has 200 turns. If the power input to the iw f7c2-qjfn-primary is 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 current at 120 V. The volta7nxl. fsyq5n7u99h *;e umawege is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in tn .lu9x7sn y7;*mqeefha59 w uhe 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 steppe tppja+vep/ ::d up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power a:p /ev :p+tpjlost 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 usuv0u9:fy/) nj *4oevducsm rv.ally stepped up to 4500 V sfrv v4. u/uneyv90cmd)j :*o by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of kg -oe6vcwn-6,ksy7s 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 travne,w 7k-s ysk66-ocg nsformer 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. Az3w*vn ugw 8/ eklep9a+:x 4cj generato8a93gkev4 : njuc/ w+ pxzew*lr 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 transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wodsq+bngv0 v07. i4hxg uld be lost if the power were transmitted at 3000 V instead of at 1000 Vvns0b 0vg4qi.+7h d xg?

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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( nczi uneps( 744ex;s transmitted 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 origin;c es4u(ipsn(x7 nez4 al 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 much energy is stored in gk6bq00je :zeoap /4mthe coil's magnetic p/mj:z4abq 0e 0o6gkefield?

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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 containsyk*rmz n9o/-x54crgu a 6.0-W resistor and an 18-H inductor. What is this circuit's time constan-kz u 4xcn9r r5/o*ygmt?

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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 ij i gd8) zmsy, d4v3has-4f/wqn an 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-bs*y;b;y)kg j) m ;jltV 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 resistance3xwt2 l3b/zm7j o9p*zoecmj f 1e n2(u of the lam323ej*z omj/1p w7fmc9u (tzlb n2xo ep?

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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 12u/pb)l;wm) ,i )9x/o knylsfd0-V ac power supply. What is the peak currebo9wpx /f) n)sdk ,);ulil/y mnt through 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 power supply. What iqff2owjlqx 4e 3 z;p,7g3nhg3s the power dissipated in the r4jq323f7 oe gpfn ;,gxzql3 hwesistor?

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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 retqss)fv 1 ,w ;gl 7mp27tw+xkssistor 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 resistordkd/3 ,zv:8.zpv.k:glb z v mt 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 resistor)ri h8yzutdprf. zyo b;.9 h )zunw. 6(4zooc2 is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at-4; z1kf gvakh 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 u5aszjw d.tj* 0;7;m opmn)bjat 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 inmtt;o, x .aln4pe39lfoc.m 1m ductive 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 necessa+(s5dy(cwb ap 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 frequencg/ i3sqhbu,;tr) 6uqg y of 20 kHz is appl) qri ,3/qgst6uh bug;ied 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..(;:h*hapz ndqh) v1f fs.mjveom8r9(grx c950-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 k10u 04l jfi tm5 5v hk,nd4ipp7gspvi4Hz?

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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 W1yb5c/3hnp9bib mgy: ;*q ob b 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 .4.yro owdef 4have 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-mF capacitor be 100 d,xzvh07 d 4r*cmvo9xWx* c ,zvm9x drv4h7od0?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor ad 7si r3e/cdmtf,x320la ewv.t 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 18vvkf4+fvl3 1 t5 nmuj2.0 W resistance, 15.0 W inducti m84 kvtjf1vnl5+vuf3ve reactance, 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 imperli,; sb,bl:h dance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are ,hilbr:s ;l ,bconnected 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 ekt758:y.q8pxct , nvc gue,kHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are coyq tn.k8 :c,c5,gpxkve8 e tu7nnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in serie ivhp0v3vsu fm8c82uj*e4/ e hs with a 20-mH inductor, what is the i ms/*u8j v23e 4 ehp08fivcvuhmpedance 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 ;1y+tt fhnmb5cz0 f7 :gkuac*inductor, what is the phase anglezttuk*cy7g hf:fb0nm1 +5;a c at 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 neededzft9hk96 hhr;l :f6m*7vlcay in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100z7*rf c6; mlfhtvh:y9h 6a9lk 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 ser 6-z3q.c lcl6jr:vk rl/cef3 xies with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 je:l6vzx/c63c rr3-lfckq .l 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 tr9,d7bza ka 2;r7mab+ cbeg2t otal impedance of 40000 W2 +crza27btrd;k,agb9m ba e7?

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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 i4y;ugbv29 zuq*-qrwm6j:t3gj3vch put in series with a 100-kW resistor at 1.0-MHz for a total impedance vigg -hq: w32tm4 c u3r;9j6ujvzq*ybof 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 /e aex :)d*ooo 0yteb4lkid,,20-mF capacitor. What is the impedance at 100,0eb:e /ok) ix*olde dyoat ,40 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 capacit ji*6,f0poj x )rt f(bmje7mi:or at 1.0 kHz for a total ibjr) 0f*6j it7jmm :eo(p,xf 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 neqmy :4bjsz,;sv0 ,v5 7apqxieeded in series with a 10-mF capacitor at 1.0 kHz for a phase angle of m;,zx v5s4qji p:7 0vy ,aebqs$40^{\circ}$?

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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 lgdftyg:9;5 0zc5 c jjat 1.0 kHz for a total impedance of 49j 5y0dj; l5zg :tgccf5 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is tm tepk -e*raze;0aos+v xp*8 -he phase o r-*p8etamvas pke-x0; z+e *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 ip)2 m2 tyyep c5u; 8rnugyod9,f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cg) y 52y2rtppyu,cem9n8od u;onnected 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 mun9kw3y w*o 7 f,os f*u2xnlbp-a*k9resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 1uxkp9f3o9*w-f, s * 2 lm7abwoku nny*20-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 b9*b:pav0 cv ocapacitive reactance 30 W, and an inductor ofv*0p abo:vc9b inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor,+w- +kz oeekn- a 10-mF capacitor, and a 0.45-H inkn+-z+e we k-oductor, 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 necessar0m6 q/cfxp3vw z27nhq4gqa4 ay in series with a 500-W resistor for a phase angle op246afgw 0m qhznc47v 3qx q/af $40^{\circ}$ 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 freq egh gycon,;yw.oema :uz1h;1l/jo.8uency should the circuit be driven in ordeh c/.j; l.yg: un 1yhea;mg1zo8, eoowr 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 circoc:7zmnrpt* ,q .w)tyuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive ro,trw7.z:qtn py)mc*eactance, 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 *xwu b u0;habfa.c3kk 9; fwm7AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistanc0h0a4cg on 8bg5, fgcde of 30 W. What is the powdgcbhgo8 0,fna0 5g4cer 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 facto z y2ahsf vau(16jbll+ 0dlw19r for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, a1j(ls9ay02db1z+a lulhfw6v nd 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 cofn;;/nry /vgktf f*- apacitor and a 15-mH coil in series?r*/ o/ vf;ng kyf-nft;

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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 capacitor for a resonls1 xwq(dr;7k0+:; jklf,t a jmr.vxs ant frequency o m s ax(djf0v7w;jrxs1: lktk, l.;qr+f 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 for a resonant foy7 rr1y5q 6gdrequeno dr5qy76 gr1ycy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mtapvddi h9g a4(4l6 z*H coil if the re4 d(dt9 4i*z6avphgal sonant frequency of the circuit is to be 1000 Hz?

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