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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 ug*;oynw- -l(qb6osx89 z tatx nits 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 inductionle1o*t39i no j9qd-mv nrp1v: 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 produces what kind of ch pne/x48:7b9tc;x ahz6 kmpleange on the induc phx clez7/:4n9pk68at x; ebmed $emf$, 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 lo (38y/evggbgt)d ptn56yhwv2 op of wire produces what kind ofw3g 8v)yvh2ye/t (6nb gdgp5t 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 kindbv+r.xda2bcp8 hw h)3w. is-r of change on the induw+hbs2-r 8pdhrb a.xv ) c.3wiced $emf$, 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 m4v ouru0;k)fvn+bq8 cagnetic 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 induced currenor)1pxch5m 2ct in a conductor will be that which tend52r1x)ohcp cm s 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 ho 1/ m)y*z2ayo/hhyujo l,d5fy rizontal table. A bar magnet is held above its center with its north pole poi /a u/5h2j)yyly* 1dy,mh fooznting 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 fla cxun)x6;v dz5t on a horizontal table. A bar magnet is held above its cendu); z5x vc6xnter with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region w)1 eos6 ytbyqslu96t6here the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fu )6 so6tt9l6beyy1s qades?

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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 regionr;*n a(mnt 9oc 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 currenc;no *nrt am9(t in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic f t8(e pnz8r tjx4/q5pdield points straight down. The m5t(xq t zr/8npp8edj4 agnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an eves8(.rtzhq, jkr-increasing current northward. Two coils of wire lie flat onq .z8s,r(kjt h 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 bv-61(o.g0/vz ev9 wzjpbwa gthe north pole entering first. A.vwj/o(w9g gz6 a1 pevb0-v zbs the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed6po8.: slvy9chkm +on about an axis whose direction can be varied. In a revs86omop.cn lh+9 :kygion 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 speed about ab whxah1p*5n-;9ju8zefscz 2n axis whose direction can be varied. In a region whexhbp z haw8-1 fceu5*jzns9;2re 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 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.yc;78 ae kx /t7bb2hdk
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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 app /4oxlk.wp 0n $emf$ 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 1f6p x-b uf71lkt+orvah 4ts, 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 (oriented in the east-west direction) is moved nq.n5kbx: cd( 6tdgc s;orthward at constant velocity through a magnetic field that points straight down. Make a statement concerning : q(ds;k ncbd5x6g ct.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 a0 ws hu(8qxqr /8,tplet 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 transf2uaa2e:mp. h imst: +lorms

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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. The frequency of 2l8 len 7)6 mxy2 ;ymv,za ntbc:o2dzctyz) an6:8 cmo22b lx ;n dyz2em,l7vtche $emf$ 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 o 4n30ho-yftp-a0uk d used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a de9 ;bn(ial- iiqbln j 36e- bfsjp;0gn0vice 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 secondas0;1 inh2orwupknw ,1/ zkd8g.f ;f uhry coil contains more loops than the primary coirik 0z.ug2h;;,n8w1f spunf k d/ho1 wl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the pn0lt; 9f /f ()gpaj;hng8n bhdrimary coil contains more loops than the secondary coil nf (ng9)l/jdhn gbtf8;ah p;0 then 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 i(s(uv 4j1 fdscnput

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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 cirzy7 p5a q*-vspcuit,

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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 idhgw h lx(q.b4-eal battery of constant terminal voltage. At the moment contaqxh4-.g l( bhwct is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battyukv b3,xph tg 5mlg3 61h43lzery of constant terminal voltage. At the moment contact is made witzkt ugm g3 ,hlp 5l361vxby43hh 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 resistanceprxvctf o :4a-1s0h v6zti))d 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 resistance R is connecczo y/4r5umb15pq0 rjted 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. Thc g0xveyr+r sw/0fvd 5q +s:8ue time constant for the circuit represen/+vc5svd:8rq f u ysg x+wr00ets the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batta* h4dcbqao rbua(-61ery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to cda-*u1b qaa4r6( bho

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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 samel (d:: 3fltmva 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 cirau 9zax+/ sq(icuit, 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 to8yz. ixo sg,*fda)atr+oq7b6 an AC power supply. In this circuit, the currentaf) 7+ .6 ,osb griqt8zay*xod

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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 0 )cyh1got jt(when the frequency is tripletctj)( 0g1ohy 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 inductor isv;mkhwz8tos4m 0 c +n/ doubled, the inductive reactance/n+84movk;htmz0 s wc of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor ;dv7 br9gi5pq*fgb9 m yr.a w-approaches zero, the inductiveq 9 gbfw ydpm.ag*i5r-7vbr9; 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 power supply. In this circuit, the curre-jbl.tws sa(vl+ieqt 9 ad+)2 ntqlt9-lesjb2)+vd . sa atiw+(

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit ha,l:2dpx.gkb5 ,w(u: zcnk cchanges by what factor when the frequency zh u5::lad2( gxbc.wkp kn,,cis 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 capacitq7s*g0l 1fpm nor approaches zero, the capacitive reactance of that cagsq70fm* n p1lpacitor

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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 anz , 2ubixf3hy/l,l ss1gle between the voltages of the inductor and capacitor in a 2h sslzx,il3b/u1fy ,RLC 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 wn-lc d(p q.v9mg)/wp 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 incr.qh9z(juq 43jl +rvp leases. When is this statem vrlp94z (3luqj+qh.j ent 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 ofivwh* w8(2 txu the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of th 4+)5 2rli ajhwanb9ahk(c 68bmdvkk8e 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 capacitance both double in an L11-4+h 71pff0oymi wvwcls dby+y- tbRC series circuit, the resonant frequency of that circu+dsv 17+4 lm w1ciyfw1t-byy0o hb-pf it 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 by an AC applied voltage. At resona q/ sm5awyl45th4 oputw +w1;bnce,

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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 ci os;p6amjuad3; +n:qhmg/ +rzrcuit 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 n+oj7:nhwxn*sn5p e / field of 0.20 T. Find the magnetic flux through the +:e wnsp7 xnnho/ j5*nloop 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 radius 0.10 m is rotating in a uniform magnet75k wd +axri7iic field of 0.20 T. Find the magnetic flux through the loop when the plane of thrx kw7i57di+a e loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is 5 76drs0nl4ap h0mq zkqiwp43b.ep2nrotating in a uniform magnetic field of 0.20 T. Find the qb ldrnwi6pmh pn 5a03epz.40 q k4s72magnetic 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 loop is reduced from 7+(qr(dyqbg 0u2 f fhf/+ar jr$1.0 \; m^{2}$ 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 fv kk.wfj-.uvj974 bifrom $4.0 \times 10^{-5} \; Wb$ 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 2pf bm150: .kq6mckub/wpxt a of wire 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 m/2wtpkma bu1 0bx6:. qpf5ck0.50 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 ,d6 g.iat7t zu15 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 areas*c.ehem 3 1dg $0.20 \; m^{2}$ 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 dkrb 4dqsw 6a,6, d04+eiczd wm flies horizontally at a location where the downward component of the Earth's magnetic field isqdi ,,b4ka w06sd6z wr 4ce+dd $6.0 \times 10^{-5} \; T$. 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 027r*z pm4jj wfv:ckk16a d knconstant angular velocity of 2.0 rad/s about a vertical axis through one of its ends whmjp aj64fkkr w7 vc21*:d0nz kile in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50sws8b/taqs; z1jf (,,ia6s uh;: 8j-ziggmlb 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 1o;chv /ga3(mm 00 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 w;c vy2i8qa p2its 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 field of 0.30 T, which is perpendicular to the axis of rotation, what will be thv p2ia2;y w8qce 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 *t l9d,qbf79om:zwc e a9s zz:of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 12 V dw/jum3tc mms0 s,yb/:mx:g2 maximum when rotated at 60 Hz. A magnetic field of 0.050 T dctm m:xgju,3ymm2s0 b: w//sis 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 with9xr qs9k5fwno:khgk)l1; i ; t a 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 y .oa,.z4c ,w4roa8bvn f0jl vof 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 kfh)rv grm9(w; a e:c8resistance of 6.00 W. The motor operates on 120 Vrk): hrema;(9 gf8cwv AC, and when 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 resiss-opx45b*t y31m8 glv0l(tuik bd ec.tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 Ac81pl tvk .bd 3 0moglby(u5xt i*e4s-. 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 power supply. Th1k;z su3r8 u; qtpbcu)e operatingp8q; busr1uz tkc)3u; 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 supply. Th ab3(fd0o4d iue operating c4fb(d 0ai3 udourrent 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 voltag o1uz fpd06y.ye 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-turzdxju.)xtzrn p(z ,r) cwf 58rv )fb/d5(5 ydsn primary of a transformer causes 14 A to flow in the secondary. How many turns are in the seconvu)wdr5)d5p/,t( z zzrr fnx.dc8y )x f5s(b jdary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V l9y (;jqqv1dan)kg6dg 9jho.secondary has 100 turg j(ykdv ; jl1d9)h6ong9 aq.qns?

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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 200jo: n/2ol vtb/0-turn secondary coil. If the current in the secondary is 3.0 A, what is the currej/on:2/ o bvtlnt 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 p9cqmbtwx mz*t+ ;:tj(rimary of a transformer. Assuming 100% efficiency, how many amps at+mwtc; x:(mbjqt9t z* 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(u ru)mbn+/pf choly;*es ); .2t zlxy sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 1 oc h+;se pbr)u2;mfy*uzll.x(ty ) /n20 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 turm n, mr-5:1hx/yd tzeins on its secondary coil. If 120 V at 2.0 A is applied to the primary, w/:5- d1nt memxz ih,yrhat voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sewoio -c97w k:gcondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?kgi co-:wow97

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hx,sp,-uc 1vz vpm1;ff5jd s.k as 200 turns. If the input current at the primary is 100 A, we can expect the p-fs ,jps 5k.vc 1 mf1;dzuvx,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 it15 . 1 qe:axudkmzglm/k(eveh9m *r2zs secondary has 200 turns. If the inpg rl1e2 :ee(q51u.zkmd/9 vzkxam*m hut voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hax 1;: msimty/js 200 turns. If the power input to the primary is 100 W, we can x; si:m/jy m1texpect 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 voltage is usually km np dkm g p56h4se4nn-9:ig8stepped up to 4500 V by a transformer and transmitted through a power line of total resistance-4 kegmds54 :m6ip n9k8p nnhg 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 120 V.vit;-n*dr ch 7vu :zd4 The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage powh4u :ci*;n-vdtz7d vr er 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 120x 97+ta 8yzuje V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage iszey+u87taj x 9 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 kdnjv 7+by+n5d 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 heating of the transmission line, the voltage is stepped up wit n 7+ny+bv5jddh a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a ta*gzrv9 7td/ sotal 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 std/vz9 7 rg*aa 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 would be lj187 pfe byrn8ost if the power were transmitted at 3000 V instead of at 1000y e rpj87n1bf8 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 line4a k;/eog8lhy zzs44i with resistance of 0.60 W. To what voltage must the generator output be ste4k 4olz/8s 4ai yhzeg;pped 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 - ti*tyimh s0 *, /qe)dqitr3cA. How much energy is stored in the coil's magnetic f-3 d)t/qsy0 ,rtcimeq* * itihield?

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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 reqcmempuhwa ( .tjpf jd2-8 mxd 0u,*18sistor and an 18-H inductor. What is this circuit's t( m8.u8,fq0x2u mca-mhjjt1pdpe wd *ime 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 voltz*6mr00c q,zlu1ci(m6hz1 jl w* axgyage in 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-V AC outlet. What is the peak currentuo-u8y- jcjv a;d 37yt?

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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 ovemhb *: x0f+m w2(wrgf the lamp?egh:vw r(+x2mb0*f wm

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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 +./8vd heleqc a 120-V ac power supply. What is the peak curreedl/+ qe8 .cvhnt 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 oj9: rjrp3qu4o )fjb-is the power dissipated in the resijq )f p:j9obj urr-43ostor?

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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 a+xlia+ojh3sf * g zwn2r 4d(2 hdq0i350-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 50-W re9-ycl9*qsq inedgw7 .qcv; z8sistor 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-j9opa0+t:w kd7d/ a no8tji2iW resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductbv0n4;vc8 gc bor 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 at0du- +z;imvwh 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 5u-adi lfk7 k/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 m*e( df;r2uzs1000 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: n enbwf*fr,( a frequency of 20 kHz is e*(f,n n:wrfb applied 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-V, 60.0 Hz source?9b -u9 1.me ibjdmn/fx

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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 aca-:yydk) ,qj t 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 capacitive reactance at wywcyd z3 *,dl2ht-9 i10 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 c9s,n4 3pz6hmkw ypo0 10-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 capacitive re pwey54zsf;e6k 3f* hwactance of a 0.010-mF capacitor be 100 W;espkw64h 3* z5efyfw?

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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-mv3zu9dn9dly0 F 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 resrn cv0h s56t5 jol3k9nistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance c6k50 on j39ts5lnrhv?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mHrh cc,hpk)x43ubm2jyi,r uhx1 /jle(zw ;z9) coil, and 1.0-mF capacitor3)ccz/izu,h9xmb r 4j1 p)ju y lre(kw2h,;hx are 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, and xo i4jazc.,2c 1.0-mF capacitor are connected in xzci2 ajo,. c4series?

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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 i +db(4f/8t.qa eic;m gst-xgns connected in series with a 20-mH inductor, what is the impedance at 1000 Hz.4cm+t8 t/bf(g ngx;i-daeqs?

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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 jv -q ur8c1(vyis connected in series with a 20-mH inductor, what is the phase angle atrvcjqv -y1u( 8 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 ft b aye9pcu. i:rzu-im 1nt+tva2b1 zfd3-:/1.0-mF capacitor for a total iuyz2bz e -t1n9.u+rf3f: m/da1ctv i-:bap t 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 seriqa:hd7m:loi8srk s xs(7- uax mtw4xa1st-( 6 es with a 100-W resistor and 15s(wt-u daxatq1:s i7xs aor(47-:6xmhm slk8-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in 2x (lgfsgm8b ;series with a 450-mH inductor at 5000 Hz for a total impedance of sl;m2gx bf g(840000 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-MHz f9sm+wxt2 ceadio 4/ c/or a total impedance of 1504w2ca+ciodet9x// ms kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is -4;m(*hzxv j/lj cw6hiy 3f5)gdji jtthe impedance at 10005ct;ij-f jyl 3dh)(xh/wi j *j6zmgv4 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-yti9ff uhfi13-he, 6xald)l 10-mF capacitor at 1.0 kHz for a total impy fdhi1f- et)h 3u-,fa9il 6xledance 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-mF capacitor at 1.0 kHz folh *4xmn;blu* r a phase angl;b4h xnlu*m* le 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 in :g :pq :rj,gojseries with a 30-W resistor at 1.0 kHz for a total impedjg::: , oqrpgjance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at5y 34w os hb8e yo 7t8yysv52lyhiw.9m 120 Hz. What is the phase anglyo io5 t42w l98ysy.3sh m8vyw75yhb ee?

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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 1 )pc3fu1ijeb 500-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser3cpi)ufbj1 e 5ies?

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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-mF1 :bwkcv 5ol0i8 )g/jn dodzn; capacitor, and a 0.ljdi/ v5bn1zwg: c0nok)o ;d8350-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, abi87 dt89l6nibn z ,synd an inductor of induct ni 7y8ibz9t6, ndsl8bive 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 ci 7e vjn/;g g2,yo5g+s ysez3tarcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power svaonsy t;e+ 2/eg7ggy, j5sz3upply?

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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 with a 500- wvlr0gz 11 :).h 0acztnxzl5pW resistor for a phase angle ofh: c1v.0 1n wrl50)zzgptz lxa $40^{\circ}$ 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 a22d9guwfn mx7.de7o/13gx ,k q(et3blpzwr = 10.0 mF. At what frequency should the (fd9xzdxqlkeg n/we 7a.wgob2r,u31327m t p circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 1btfvwc f3k*, nq1j9y)5.0 W inducy v,fnb* 1wj)q9t3ckf tive 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(kt2g7oft5 h a zaenkk 4c8x6p)4+x qx AC 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 resistance of 30 W.c6rh3lvoe 3 joe r2;9h What is the powerr 6eeh9lvo 3or;2hjc3 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 seri/ethz- ;tsb1:uph ,yles RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-,:hz/t bs-e1ptuyl ;hHz 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 +l(vvdp aw- (lfrequency of a 1.0-mF capacitor and a 15-mH coil in series?dvl-v a+(( wpl

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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 reu-7pn*fqnu(2 enlzj ,w m,4f fiy+0yjsonant frequency*n4+-7fz n jm,(wjq fip,2uyf0une ly of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a ob9f5w:b4g -wvcd+wm resonant frequency of 1000 Hb9-4:gwc bf do5v+ wmwz?

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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-t./ew*hdt o/ omH coil th//. t*dwo oeif the resonant frequency of the circuit is to be 1000 Hz?

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