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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux ext zcm;gdh pod26l6l; u)/ht(mcept

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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 thai ,vrr:crrm( r6:vv2d.ks p(lru ;ef:t 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 cha8 bcv*5u2i mfinge on the indu8i*52mufb ivcced $emf$, 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 fiefhn9q+aq0v4o b1al54 k*dnz d*n pao(ld through a loop of wire produces what kind of change on the induced n h5*vkzb*dp4oda+ n140 (q9aa onlq f$emf$, 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 r:a)t 7gqc(fv, g9mbt produces what kind of change on the induccg)(tm:7 fqgb9t,r v aed $emf$, 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 cw7opp4 0;1 iki 7y1oua va-ywmagnetic 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 dij; 1iwh0kjl)t6 wy/uq rection of an induced current in a conductor will be that which 0l jj /w;yk)6w1quihttends 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 flz*90iz6vhn6pfk r; ngat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abo0 k6nirp*hgf;6 zn v9zve)

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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 g):j2j; 4t lfaaj qzw1on a horizontal 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 al;)qzw fj4:g21 jjatn 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 *m4vcmmo+2metqj bv d,r +v6 ;p8jud )top in a region where the magnetic field vector points straight up. The magnetic field vani+c+d*mvmvm,mj r2 86ju4tpo )qdve b ;shes 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 a region where the magnetic field veco5gn*wl0x x dz)j71twtor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil* w)xz7lnt1owx5j 0gd 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 nw ,5y z1,qwyiwhere the magnetic field points stq 5,yi wny1,wzraight down. 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 horizonzxms+26/pn+z w; vrfclm3ex 1tal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced zn; rwflve1c2xz+3m/+s m p 6xcurrent 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 thg gczn 7hh9d:i(ih) x8rough a loop of wire with the north pole entering first. As the north 7 9h: gch ihz(8xn)gdipole 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 gwb, 96yc3sv7( bbvt uis rotated at constant angular speed about an axis whose direction can be varied. In a region where (bu b396bs 7 vt,wcygva 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 constantdm(8 6; +aajccqk j2wt angular speed about an axis whose direction can be varied. In a regionj t 2qma jaw+6;(ckc8d 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 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.gv zz()8 g9.gd pvitw.
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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 ant;l j6 tz;kkrsq. kt76 $emf$ 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 magnxjeg oh-cn8y.z(mj3 . etic 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 m05uh i4ufmf )moved northward at constant velocity through a magnetic fieihm 4um)0fuf5ld that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a -u*mjp0 htn ;sv0ith(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 transformswc1c82ht 7l lo6fjp i7

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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 sec cui)(ch6vxz/ond. The frequency of thixc(6/uz ch)ve $emf$ 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 4a bg, ;xttk8zl5t5t oto

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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 devifgxf z9be*+hiuz/j 2k- p)pa 4ce 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, if8yl q+eu +5.lny7yqex the secondary coil contains more loops than the primary coil then ex y8l5q.u+qeyy+ l n7it 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 +mrwl),7 ifldb*so,1eg ki/xthan the secondary coil then iti lg*/wxk+1el mrd7osf,,) bi 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 pf3,su(cdi bbzpt, c3:ower 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 rbaw58 1wtu c b6ii3b9circuit,

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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 r yq4 u,obms5yd4c4+ iconnected in series to an ideal battery of constant terminal voltd i4yy,rsc+ 4 uqbo4m5age. At the 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 conne:d k*z6d**;h*s poga w 8wimgccted in series to an ideal battery of constant terminal voltage. At d 8ogpid* 6wsk**;wm:ca*g zhthe moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductancewz m:28hj u*tnrk7e9e L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 :h gw.tzq,z5 sbigv//resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery.2fn o8vz3a;o frnqy9d-axdq3k /s8 3v The time constant for the circuit represents the time required for the current to reac/ka8nvo;q2dy nfsdfv-3o z3qxa 8r 39 h

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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 connectef8x+u tg,qav2j.z5s 6d.ct f sd in series to a battery. The battery is suddenly removed from the circuit. The time constant for of td cfufv8j2gq+. s 5st x6.taz,he circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excey3odav92(lx:6mwjoc ;)lu m +oowd h *pt:

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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.als ,ogn 4p.3(n -irce 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 su.-sdobuhw e a2(m.b9 qpply. In this circuit, the current .mudb hwb2s(a.oq- 9e

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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 c ,f;0mb axzfg w,ynr97og vc./hanges by what factor when the frequency igof v7 a;,,fc.znx yb9wmg0r/s 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 in nog5 o8nf(uq bx4 ;36u4yijtaductive reactance of that intn iu o;3x64fj u 5ga(ybqn84oductor

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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 volu,vu yhc,v/ vvil+-z0wb 4 nv6tage across an inductor approaches zero, the inductive reactance of that 04ilvvy,uw u h,vzb6 vv/n-c+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 connl - )w(nyd/i6cgt x.kuected to an AC power supply. In this circuit, the curren6ct- wigdkyl .()x/unt

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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 ciry.wk7x;ix)z pbi6pb7 cuit changes by what factor when the frequenc ;b)ipzx. 6xpiw77k byy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the ca (b :swu:6cm9dfxm 6uopacitive ru9u(sd :c6x 6 :wbmmfoeactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductorn9lsi(*iaxrj p;yk; 3 and capacitor in a RLC series circx(9n;jp* iir;ayl3skuit?

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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 Rfhjj.9b.rs6h LC circuit is defined 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 impep()te2azx7mg2 ckirs: j;+ v edance of the circuit increases if R increases. When is this statement r27taczj +) xe2ik(: sge ;mpvtrue?

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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. ie h bq;b*nkl,iw9fqf* ,+chk0vvh- . 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 in(oc q1 *ph+xptcreases 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 af i/n-ex-:uj *tj+ nign LRC series circuit, the resonant frequenuei: +-jgifn *tjx/ n-cy 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 voltage. At resonance,3qohgg t.k0xx04 y9bnu* mtz7

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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 occursc 8pcju g(t00 ,:su7jun ousw,ip19wf 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 bdp9l+4svgk 0of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and t b4lvp+d9ks 0ghe 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 7j)o 9 6- e0enxgzq7ogs n:vws0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the pl n7 ev0sq)xnzoe-g 6go:9 s7wjane 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 0.1ne dvx336va q:0 m is rotating in a uniform magnetic field of 0.20 6da3:n vv e3xqT. Find the magnetic 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 rra+ h6uv9q6s ,eg( /xt,ffwameduced 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 ftoty l1 a,w;dmrkffqw- 7hs 6-*:r6lqbc h10 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 wirq nn ihm p:ru-3z.9nm(e on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 m hm3inq-nnup9r:. z( s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and ac*n8qtx16d -.vftj,(apyrnin 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 alo r+8+9: ns*ugv xdejrea $0.20 \; m^{2}$ 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 horizh9p**s os7lhyhqq19tmnw +wyq55s ) l ontally at a location where the downward component of the m 9owysht*+* )q17qw l5sshl yp5h9nqEarth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotatel.lbwozs u+)+s at a constant angular velocity of 2.0 rad/s abzwuso.lb +)l+ out a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 lzxk/ 7skbjjn-, c9j5k oops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turn jq9vkmi ,ced8 xx0l:*s 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 recaf.+ er;jmqmklhl1*7 x0vgo 2 h:aj4rtangular loops 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 T, which is perpendicular to the axis o rjgk47a re+ vjlhfh lx*q.2moma;:1 0f 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 whm dnxdei -(j( -xq:a,ire 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)-o b j.qxfefay 4+xt1 output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is-y f xqtfe+x1.oaj)4b available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with aq8t fj2v yn9q).tpvh9dke 3y 2 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 ni cl7(.ezup *hb.0,d zo xm;jmotor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 c6m-y th)h *2o0mg3s6p0nyt/vpv hisW. The motor operates on 120 V AC, a/*m o6cs) n3hvgs600vtmh-p2i ypyhtnd 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 resistance 6.0 W is connec *3ke4tf; dvn6j*ul 0ag-v ikkted to a 24-V power supply. The operating current is 1.0 A. What is the start-up currenl 3 j a0e-v4kvkk;giud*n6t*ft?

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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 nl1c(a j:4ms w0k,nxeis connected to a 24-V power supply. The operating current ax ,0 nj1( welck4sm:nis 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 supplyrs.x.som4i u6;ssu 9o. The operating current is 1.0os oi96 rs suxs.um;.4 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 transformec+ pgmu gjd:g:gv-d3 pn; 5cco) :x6khr 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 transformer caure (cf/w:3zlx)rq ( x c/t aj-9ydkar:ses 14 A to flow in the secondary. How m)xxt3aw/r y: :zj/drfa9e-crlc ((qkany 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 thxxy7qzvj r/d l5y46-y e 24-V secondary has 100 xl jdz 4q67r 5v/yx-yyturns?

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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 coim(jw )v- 9tvq2l6juu 5oe0k+z5 mr fqkl. If the current in the secondary t f5qvu(+j 9) zqjmmekvu2 0l6wrk-5o 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 cur86p7 7jnwof5+ llhin the primary of a transformer. Assuming 100% efficiency, how many amps at7wn+lclr7ohf8u5 p6j 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Thejnj ik-b,mq. u va(qd*-bjz40 primary coil operates on 120 av im,bq-k .(j *bqzu4jn-j 0dV. 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 turn(lru uwi7tc)d1m g y0:s on its primary coil and 300 turns on its secondary coil. If yd uimc1 t rgu)(w0l7:120 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*i (hodx54ex0)ng hky 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2d 0i) ex4* goynh(5xkh.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If jwqo6sr-cf** the input current at the primary is 100 A, we can expect the 6f q -sow**cjroutput current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its +q/gjdn/gd( jsecondary has 200 turns. If the inpu/djg ngd/j(q+t 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 secondar226k vt fctxr,y has 200 turns. If the po62ttc x,f2rkvwer input to the 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 120k jnx/ j.gxg2,)rwb3)+pgp5l cejt *t V. The voltage is usually stepped up to 4500 V by a transformer and tranj +)r 3gb5jw.xlg/tnxgt)eppc,j2k* smitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuallm wlh, yiwlf*;1 10kxoy stepped up to 450; xllkw 1,f* owh1iym00 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.

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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 ii .icli h/fc8/tz,)o current 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 percentage power lost in the t/iltzo cihi c),/i8f.ransmission 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 ;qi *1pgx*tqeu(sh.j0uvd nx* )q-ollong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the originav*dhqxt ; n.pu10 xo(q *sjule*giq)-l 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 -nmg xzv6,7rfkyju l6)c 6491zdpm mj7z:mrp a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a) n4ly gr9f6u 7zpxm-rz1:mp 7vm6mj cz6kj,d 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 tqfuu89 nne( nilgjq 21fu9)5 be lost if the power were u 1g jef 9n5)2nqtl9ni8uq(uftransmitted 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 440ltb.lp h4j00dx vwk2. V at 20 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 th .dwk0lbh4l2vt.j p0 xe original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coila 5,cg;q0ktkp0 k hquue97 ,,avh:paa's magnetic fielgu,vka,h ata;h0p7 :p,cu50k e ak 9qqd?

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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 reg7tich w0h- r1sistor and an 18-H inductor. What is this circuit's t710grh - wtchiime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage i*- a(o g lj6xw.pnag:mn 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 place8s(gc8*c s mb-ozkl q1zl2+vkd into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of thi w7qg9vu( e4xe lamp?wi7eguv(94q x

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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 ai n x:8y wj(cs;pe)tcpx9r-+ the peak current thy ne; asi+w:9pxx()8-jc p rctrough 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 connzdz0cqg767 )ign zu 6cected to a 120-V ac power supply. What is the power dissipated7i76gun 0cc6zdz gqz) 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 resish:z(b-6l d1 yfm5jbam tor 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 b;a5ya7v q6)zo.gqn bresistor 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 fy5w.iclan/ 29a+y8 :limoqp-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance9zig v dxvv39) of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil a4wz2lmtrh(w(i m/; m 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-mH coil have 14.0 W of inducti1w*hod eedl1-qjcef-(* d g g u3awt69ve 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 h w301nqa ,k,vxkt8pc157 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-mu1:-w9xzaxw4 asxzt/6jk4z kt: wa6 lH inductor when 120 V AC at a frequency of 20 kHz is applied to jtaw6:/x z:64wlau tx-sz91xzaw k4kit?

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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, 6xc7vq+ sf:eba k (90w 6jguko-0.0 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 c 5sb,5dt1e 1afs2aiazjqt4 .eapacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kH/rvty m4.;ik)t zt7n k6g7 wl-bvv pj7z?

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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 capacj2uwdawd ( ,o*itor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 1kmx5k- y6j4eg 00 We 4g6yxj-k5km?

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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 19jk dubu.g4 u9kiw v:mj2*ft67dxn*v000 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 with7u(kzay9n ;i+lt sl r39bkz.b . y9vwd 12.0 W resistance, 15.0 W inductive reactance, and 10.0 n99..liybbukl;za3sz k7dr ywt(+ 9vW 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 1szj74 n( 9p+czvto -zf00-W resistor, 20-mH coil, and 1.0-mF capac7c4-( +9zo ztpnfjvzsitor 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-m6zwh89o fkpy3vw7wq* z1 e. ybH coil, and 1.0-mF ca6q3oypywz 8zh. k*w917v bfewpacitor 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 connecty pef q:;.;eared in series with a 20-mH inductor, what is the impedance at 1000 ;. qea;: prefyHz?

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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 ot1(n5 n -o-e1tjqubcwith a 20-mH inductor, what is the phase angle at 100e1(jo-t 1cbnt-uqn 5o0 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 1n ju77g 2n,ovwsy g)e t6r0pk2.0-mF capacitor for a total impedance of 100 k7o eg w2rj2g n)vsptu0,6ny7W 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 capac5ilrnd 90kxvjja4caz/66uo9 itances is needed in series with a 100-W resistor and 15-mH coil to get a total impedauk9jd5 o /i 0a96xc4 rlvna6jznce 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 series with a 450-mH inductor at 5000 Hz for a 17kvdfhri7x 9) li2p- qbwaz/ total impedan 1hzik/q-dixarvf9 l2b p7)w 7ce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in sertxi0sh6 :sj)h ies with a 100-kW resistor at 1.0-MHz for a total impedance of 15sh0x hisj:6) t0 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 ) *o4ngu*vfj 6dzen(v with a 20-mF capacitor. What is the impedance ao**u64( gvvn edj z)nft 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 wibs66 vnw3g6 r 1xsn+zpv:8aloth a 10-mF capacitor at 1.0 kHz for a total impedance a nx6p6v sog68lrw n3 svz1b:+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 cyawi2qb3lnk +s iomq- 88*/ooapacitor at 1.0 kHz for a phase angle oy wqiin+so-b2ol38m* a8ko/ qf $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is ne2* g*eybp as+hf9t jq9eded in series with a 30-W resistor at 1.0 kHz for a total imp9f + p9*tbyae*q2jhsgedance 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 at 120 Hz khfg2 u3uv:t). What is the phaseu2tghvf)u3 k: 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 4ydrav)plmxan c 35u0rq369 g1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capauyc3 qxdv)gm3l 4 an6pra0r9 5citor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists oh xgn+qpg8dtenvom82z ya f1601e(8mxy w 9d;f a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductorggf6 p (n;hmm11tx8z8 98nqd oya0yede w+xv2. 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 -k f:jwa-pdb5 30 W, and an inductor of inductive reab-kd -: fwp5jactance 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 a0uz 7l6c1blofli 6vsl 51(j4q9u0 jha wpguu0 series RLC circuit containing a 50-W resistor, a 10-mF capacitji4 vp0fwg u1qh0zjul 6(o l0 asbul6159l7cuor, and a 0.45-H inductor, 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 sm6i/ 7e1s9)umvftr y6h od3o oeries with a 500-W resistor for a phase angle ofs69dhtmu)o6 1mreoi37fv /oy $40^{\circ}$ 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 = 2ge0 0et9ywgkim u; +1z0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven ine+w9 ziu;0 keg0tgym1 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 se)x+ rhrrwv2yj f+e54 pries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V r)yr+5wjhp+ rf2xv 4epower 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 is w 4lsn,v17-rn2 0gsj mtki 2dvx8lj6 r$63^{\circ}$. 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 Wl ,b7d 4d9nmqt:ug2 7jh7gqjr and a resistance of 30 W. What is the plu 9g7 dhqn:mbr,j472d7jg tqower 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 Ri*7e fg.x unf-LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induc.fxn-7uef *gitor, 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 capacitor and a 15-mH coil in series?0p*0-faiw hl:g d vr)ee-wvf:0aril) d*g h 0p

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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 serw+f( vd (f1ov r5smql4ies with a 4.7-mF capacitor for a resonant frequency vmw( q1f+4vo (f5dsl rof 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 serfp bd.m i);y8125nz3mgz+.vei dvf dwies with a 3.7-mH inductor for a resonant frequency of 1000 H+dmvfifedbm32 i)1dv.gwy85; p.zzn z?

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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 ik0 splmf2i*k/n series with a 30-W resistor and a 40-mH coil if the resonantsl2 ik*f 0mp/k frequency of the circuit is to be 1000 Hz?

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