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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 +(y(o-4o9 wrxeqkph5 p2w -d dr ok6rhunits 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 bv*xciru 9q an -e8hm;a:3t-ithat 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 ki+tdg a *;9j:y.w.ofvi6asm vand of change on the in da.mjo +gwtiyvv9f6a:a;.s*duced $emf$, 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 1 +a k1du7+ y0frr(q-tpwszgcxs7m;x loop of wire produces what k(dg cr0sk;f-xys1m p +7q+r ta wzx17uind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of cha. 7l9(ils2 jmz)kc ihn/3 teuznge on the induced/2czl7.liht zke 9()unjmsi 3 $emf$, 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 fron r1vuv0gx1( ot1xvk +m a magnetic 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 curiku/i1o40gnk d- 9l jirent in a conductor will be that which tends to produce which of the follogn k0l 1i9d4u/jko ii-wing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a hob9f7b.fr*uzqbzi/6r 3g 9pu in69kpjrizontal table. A bar magnet is held above its center with irruiq. pj 96fufz 79nb/kz3bb*i 6 9gpts north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontyn gs+ 19tndd+al table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (whe tdg9sn+d+1ny n viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vectorgw59d)z (5i kmr bhai .8svk)t points straig59vg)ad8sm5b i it. (kzh)krwht up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in qp 6*t8i,)m+ke ck+adnfqglser6k,- a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. k q8seda6t- ++c*q6,ir p lkfm)n, ekgWhen 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 horizontal table top in akj 9o c,e,pme. region where the magnetic field points straight down. ,pmko.e 9 c,je The magnetic 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 ever-increaks yo-w+ 54onysing current northward. Two coils of wire lie flat on the 4o y+k-oswy5ntable, 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 throughsrd 3eqj/ sy5k0x 8de2 a loop of wire with the north pole entering first. As the north pole entd8 k2sey3/5xqd 0e rjsers 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 is1(vr*qlx f6c +kash0i rotated at constant angular speed about an axis whose direction can be varied. In a region where ak q1+*f6rvc(l0h ias x 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 aboutr i s)0l*zm8t;6sug ql an axis whose direction can be varied. In a region where a uniform magnetic field points straight dowrtsm*qg zllis86)u;0 n, 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.kv3g :j(q;i ya
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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 -+bwnyfk+z jqbf 3kbn*u * 9w; 1rwg)ithat 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 mag.tyu wxxqp2/a73d m9 +(g czg/xr+nmxnetic 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 northward hsnro1 axn:87mh b4, b4a8lj tat constant velocity through a magnetic field that points straight down. Make a statemeh :,ab lmbjsn r8xa4841 n7tohnt 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 rxw2jdeypxc, gr.j64 * (cder6otates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tran.yu4 rh:qy2xl:b r (xssforms

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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 4 /bejkh0yu.ap4/fuv frequency of th bfyke04up./hu4 a v/je $emf$ 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 usalc.v,b u9 kqcr-m1u1ed 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 device tha+ lqddr l6b:4ot

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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 secondarelt *j. mr n0iiuj7hg. n3eb3/y coil contains more loops than the primary coil t 3l3 e*mir j0jg7.ni.hutbne/hen 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 primary coil contains more loops thavmgoyll 6pxz-n*g )uub+-rt 1b5sr: 4n the secondary coil olr b+:4unrl-*vb-ytmpz 5u sx 16gg)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 inpu1bn:-w: 4oe7prjbn lpt

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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 circuitcftbh7 goz; **,

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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 arem /2 ua tqns4.qs1vu+,5yawpk connected in series to an ideal battery of constant terminal voltage. At the moment contact+,w kqu4ss1at2qv/p.myu an 5 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 l:lv9pk,hmj s- vb/-yin series to an ideal battery of constant terminal voltage. At the moment contact ps9-,hmvllv-k jyb :/is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected tuq;kds3 ( s:kmo 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 connecrnjl 1+ 3a6dakd w,-9h xlc*kiqho) +cted 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 szo4s qp8don uw1x:*7time constant for the circuit represents the td*4u xzs1snp8o7o:w qime 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 ci)t0 reqg; pppu).(v cu 9c rqzp0r-3in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represi p0u(z).c3pgq0crtupre c;- ) q9prvents 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 hk i;p.)zw x:wsame 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 ppl u 00jsk;iw+i4 9jc vnrneqfvzo9*.f8 1/xbower 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 circu*6 npa6w,i9a lel grmg3 7q;ymit, the currenti p; w6rlq nye,ala9g*m736 mg

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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 w 3if:0gi4 -7wp rdmeqz mi))qac circuit changes by what factor when the frequendwqfi0i gmiz-p 47qem 3r)w ):cy 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 m)t,h oejuhw/ ;5/a rkAC voltage across an inductor is doubled, the inductive reactance of that inductj t,5m) /kroa wh/ue;hor

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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 tapft z/i+pjaisomr:k 6/j 3d8j(yn/ 3he AC voltage across an inductor approaches zero, the inductive reacto6t/3jir fdm(j83 p/k+yajap :/zn isance 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. Ib.yv1rs osl1z1j)w0 gs/gua/n this circuit, the currenosv1gj zb)y g/wl0su 1s/ra .1t

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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 c vb*,h x;jmsh,ircuit changes by what factor when the frequency iv m,h ,*hjbs;xs 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 d98ovc(9x 5fd -yznhe )g.oexapproaches zero, the capacitive reac.xxezdovehn9 cg-d (8 5f yo9)tance 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 vo4h urh)k2 gl(dltages of the inductor and capacitor in a RLC se )24krh(hguldries 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 tkx*un m:+vq2glho9 xp*v+ m,$\cos M = R/Z$, 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 circuju g g59*u0bwpmz-5vait. The impedance of the circuit increases if R increases. When is this statement ujgg aumb5- 09p*zv w5true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuitp+d5 j 7mggbbs8 aaxe u*..j,g. The impedance of 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 the circuit increases zc 3ul0k,jmb-y(f,z s i(t2hsif $X_C$ 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 LRC series hl1 i3; *6v-3k+ocpa/1kefe;qhgeowgv sg 3ncircuit, the re1gg*hs3o io e/eve ;lpk;w-ha33qg16 + nkfv csonant frequency 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 by an AC applied voltag1br t)pfefq5, e. 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 os1y8p (q3ev 0ywzv;zyccurs 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 t r 7r-,h:fv0;t; jqcbybsz;r of 0.20 T. Find the magnetic flux through the loop when the plane of the loop ;-r;7q:0j; fzrh ,btycrstvb 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 magnet2eh5t7 zo h(qg7vs sv:ic field of 0.20 T. Find the magnetic fe (gshts: 2h7oq7zv5vlux 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 m is rotating +d+eglc*fxv4 y zz/mv. 0am5kin a uniform magnetic field of 0.20 T. Find the magnetic f.5vc4zd mma +g/xf0 ev+*kzyllux 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 singycuewf fl,83d *,voyc vpwa 7(x6 dkw t5i*q7:le 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 changecqjm+5/ up9v vs 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 squar:f 3fb :+y8mqvbzf0 xfe frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plan3 ybffmx08z:q:v +fb fe of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 4b vyjmz8(nxx9yw/1jturns 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 ghdc,2c z kfr+9bf. /a$0.20 \; m^{2}$ 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 flieqc l; :/rgs di1vwgh. 46nli:ws horizontally at a location where the downward component of the Earth's 1qwi;c sr4:./l6l i h ggwd:vnmagnetic 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 co1lem3 9g vdi)tnstant angular velocity of 2.0 rad/s about a vertical 93gmv1idle t) axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 l3unzqc cx:7 6fowrfi/og g*9 iz4)/bvoops 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 consist8wq1kve,+ tgw/kgugo f l1+ b2s of 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 j6z)2q2e jpb kbza+v* on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 Tbjbqv)p6 2j eazz* +k2, 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 consis.rmz 5gyld )+mb )n.afts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC gene*j6 ziwc3 q3lqrator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field * iql3cj6w3z qof 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 generatortsy 8osp6:n8g with 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 of 6.00 W. The med, jab5u6m e-otor 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 renmt/;8lq 0 1puh.ld nd5 .ersrazzth *3+)lxasistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it genea*1s8tzd) ph..lz hre ;nrxmq+ul5 3t n0la /drates 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 -qjp( p89 ocv,iilwoux8b;n(24-V power supply. The operating current is 1.0 A. What is 8 ip9n, (ucj;wlb8 o-vqopix(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 connecte1:v hs+) cwx(tfsf ds: *puq-id to a 24-V power supply. The operating current is 1.0 A at full speed.vc + x-(is wh*:)fftqp:d su1s 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 res 7aae65nff qo+m 0jkvvk- ya0h.ew:q,istance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is7vnj+.oaef : aa- fe qky vwqk006,5hm 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 2sos,+ l eqi-vneeded 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 transformer causes 14 A to flow in the d*f27sd xlvg 3 7ii/kcsecondary. How many turns are in the secon/vkc7il gs7* dx32idfdary?

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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 primaryo+vp,x6l rp (y if the 24-V secondary has +6y(,x oplpvr 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-tur+h 9ua8 xfeot y6w*:/pg /revvn secondary coil: uy/gf 8wt+/a9*eh pervxvo 6. If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100%:* ye ve:0wbw ;*dgbdc efficiency, how manyg y;: w*bv* ewdbe0:cd 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 transxy;eppp)u/ brr2 h -r2former provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whb)p2h/r x-pyupe r2 ;rat 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 tuanxm 1 ; 5eu:s js;i.syku3i-erns on its secondary c iumiukn3ssysx.1;;- j5 e:eaoil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on20w: )g:ojv nobkyq w0 its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, w ywbko)200wn:o: gqj vhat current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sec -9 s4jx4u/st9za0,l pxmbgvr c pa3/oondary has 200 turns. If t mv/ xa4sbx-/gca4u,9t0 3j rp9 oszplhe input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has62ddppw k0s/qgr)v i) 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, vqd)d2pi r)/06sw kpgwe 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 hasz * ngtx6owyn3fq/abxt6*1: x 200 turns. If the power input to the primary is 100 W,*n*za66 x3twoqx1f tnbgyx: / 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 currsj*.wx i1walk(6urw (o;dm9n ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if tu wkr1(.j*xl9(awn 6mdiw ;so he 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 steppm+j g33j v,oulz,0+m:sbg( cggdx 5sked up to 4500 V by a transformer and transmitted through a p j+cj(ggo3s+3ux5mglk ,smzbv, g 0:dower 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 Ak r ehffyb l;.ii.c.lvyz* fm15xje r5cc1+94 of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted t1 i. .f9 hfc5 *yfxr1rcil. myjl4bczk+5eev;hrough 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 ke70if2qbbb /ne(i(lj9f+z b x m long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order 9njeix 7z2f i+/lbf(0bbbeq (to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of0f ktn060xmsqm13g4 5gdq0edq, r hdf 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 0kxmdftg f6, 1n4sgh0dqre q3dqm00 5 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 muchty7nx*d4l iq/8z/ czj)f p8eq less power would be lost if/4x*d87 )neq jp if lctzyz8/q the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 2tz*na,y1llklh.., 55xdyi ee0 A. It is to be 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 original ai5tlhe en* x.kzy,. l51ly,d 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 energccw9at;by h sq2s +1g9y is stored in the coil's magnetic q c2+19;ysgwsct9 h abfield?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and azh ), )csv)ydvyrwc d2l *89gvn 18-H inductor. What is this circuit's cg)8d*l9vv 2 rd,wy)v )zchystime 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 vol 36m q,awpmj,rfa.2 vzg bev-7tage 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 +bz5 b 7znb1tn:.ddlcl+ef 2boutlet. 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 theqsd-7zy 7k e(mp5 fga* resistance of the lamp?7(zmagfsyp*eq5-d 7k

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak currdmeqs91y; w ,kwsn)v2 x*h 4otent through the omwtd) kyn q9;, 2h*1 essx4vwresistor?

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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 fhq2m y(r-x as+bn (c1ju7d8usupply. What is the power diss(n2b jsua c+x1d yur-mf8h7q(ipated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistolw)5v.mxyaend- 2ol( r 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 resistor .r0vio *afc6ais $I = 0.80 \sin (240 t)$. 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 res1ozax82eda v3 if dg/: u9qh1gistor 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 gkg6rv5 2nr z6tdn3uj4l+ q) :rh3 h1vn fz*hp1.0-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 reactazlz8e//s k.qrvj0,ttbb00,p p t -yxlnce of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-k2gkk9 z-uej j/o/ mqdvw35 p/mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessa,ty n5(m0nhvi 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 i75o;n75xy jid4uxl smv2od/ a6gb.caa p55ep nductor when 120 V AC at a frequency of 20 kHz is 25 /d op5p4exs6c77il5 v.abjymou an5x;agdapplied 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-m-2 ,0.ia2uuf ksxowheH 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 kHzs4qbeeo0;ip e 4q hv7-?

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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 .(9gw4 awm; ;yjqsdmbto have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor gh-0e vl2 oeoh0a6x(hhave 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 reactanc5xs * )2wgrmzxe of a 0.010-mF capacitor be 100 Wswr2 gz5 xx)*m?

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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 at 1000 Hz and 5 qm; 2s:kf-kuimz0wuu/o./ rs.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance,v9n d jkevi4p7m .y nyz,2r5w+ 15.0 W inductive yn9n,pvz5yij kv.e m2d74 w r+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 impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1 wiz j5gk6ywox j)q ,sql95hz6o*ad+3.0-mF capacitor arj jgi5)+qdszq kh*xoz 3l56ayww,o9 6e 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 w82 raqai/ 2pc 0dxc3vs+u5 esku:5xo py*v)h at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitosskuoxiydw +p5:h8u32pv5* /r xqc2acv)e a0r are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series wi9hl a m+wf9+rmhdy5u8 th a 20-mH inductor, what is the impedance at 1000 H9m l+hm895d+ry hwuafz?

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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 wityorj0 9,mzrcj 7h be76h a 20-mH inductor, what is the phrzbj, r0m7j9y o7eh c6ase angle 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 ne13 b0dw)v ufseeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of dfwbu0v)es1 3100 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 10ly 3a+uy6 (r7;a5k cfwpyiap .0-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hzucpyay . i3a+;(wkf6ry 5p7la?

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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 s+bwm*w +jq rfxz:t5 f0eries with a 450-mH inductor at 5000 Hz for a totzw5r+b f qwj 0f:txm+*al 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 p0iv t2;og.pjio4s hg9 ut in series with a 100-kW resistor at 1.0-MHz for a total impedance of2hg4 9v0jo;p.tsiig o 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 serieoo/i3 2ueg6 dynnh.dgm23ongyj :9a+ s with a 20-mF capacitor. What is the impedance236og3ao euh/g:.d2ynm o9ni+dygnj at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF ;h( qbi9.n5a32- mocne nnria capacitor at 1.0 kHz for a total impeamq n5 ah; 3 niner2o9ni(c.b-dance 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 8vz,c,nb3j f3upou 4 afor a phase ang 8buf3p,3ojnz ca,4u vle 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 series with a 30-W resistor atl;jks (i70kk w:h42weoi fhgc/ iu-7 t 1.0 kHz for a total impedancch 0hk uwt/gwo 7i2-fi4(ij;l7ke s:k e 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 cj*f by(3jqx :bu6,u9+ww nkg mapacitor at 120 Hz. What is the phase angleq,:9+m(wjjubgb 3fy k n* u6xw?

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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-W re w/(pph(y/6yhk zx 625ljtzmv sistor, 20-mH coil, and 1.0-mF capacitor are connected in vj(6p/wl5t y(k/phh z2x6 myz series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.*5mu /g cudzp:0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuitdzp cugmu*:5 /?

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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 capacitob-d8a-)v 3hoh 3ne 1vs9 xtbpkr of capacitive reactance 30 W, and an inductor of inductive reacta3x93bvoat h de)-n8pk bvh -1snce 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 ek /jh,xwby*ja5;o0 aa 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor 05w;xbae/*o,h ayjkj , 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 necessary in series with a 500-W resistor for a phase angle ojg s:)uls.b+y f y:)gl.+ss ujb $40^{\circ}$ 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 whatavf)+ky0rai3vfm0-h prj s*l o.59gw frequency should the circuit be driven in order to have o .-a5rwil f00f+mag)rsjhv yp k*3v9maximum 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 cir u9r 4bnc51dstcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected194 csbndu5rt 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 circuit e g fswi 1x94xery00zq(v;z.+iskf7 w2eamq 7is $63^{\circ}$. 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 ar7*mibl+ di2 .lt u* 12gjgc:ijhyf(jnd a resistance of 30 W. What is the ihu1m: l2j(jf* i +.gic7ld bj2t*y rgpower 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 RLC circuit containingi2pu/ x1max *f a 50-W resistor, a 10-mF capacitor, and pa/x *1fi2umxa 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.+wg z ,nx/exz,0-mF capacitor and a 15-mH coil in series?ex g,/zwxn ,+z

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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 capacitovs+d;y llot(0)6pfpp 1ry yo2r for a resonant frequency of 10 kyo)yppf y;vldl1620(p to r+sHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nee ftf 7c+r/(q7yl+ yscvded in series with a 3.7-mH inductor for a resonant frequency of 1000 Hz? 7 fy(s cv7yqr+ct/f+l

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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 plac42ts dyr01of 0s;qb dced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to b2rt 0sdsd04fy1c;q obe 1000 Hz?

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