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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 magnetf/wx.utt03 qgic 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 stat/s +/cfmw6kv mes 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 ooh:g9u6fk bg)2 j;zylf change on the induc6 2g)o9uyflgkjz:b;h ed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of o(mkno1; fd4z wire produces what kind of change on the induzo1dom (nk4f;ced $emf$, 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 change on the ind5;rk7g j2rt,,l7mb2zhyna.k2ph j ev uce;2ylj.,ha p,2hk zr2m tv en7gb r57jkd $emf$, 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 fxvwpeh.6 wwdktbqyvn 1:2 1*)rom 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, fzofh+w)r0t *z 17o;r omp(zsthe direction of an induced current in a conductor willz1z 0wrotf )r;op(oh7+ *zsf m be that which tends 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 flatw 39b0up./i+y p izvhv7r vq87ic.pa t on a horizontal table. A bar magnet is held above its center with its nr7zhbu3vq+pp.y c. a 9t8/iiv0ivw7porth 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 p4)8c 8cy)h04 +n p-zxfmb ;zehdmj4tkz:yhh horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the b:y0+zfhczdj84 hcmy)thx;z hmpe p -n84)k 4 falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vp j/q 2.vs:0czjbv/dl ector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this dqs:2 / .cb/0lzvpvjjcoil 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 fiewh6 /o 4 8h )byahgjwh/vw+c2mld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the i hgvow b28/h6 4acm+jyw)hhw/ nduced 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 a r.i m ggx*v1l0 4bb;2yrltnz3 aegion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as t4v;gyx. 2*llzb0r3angbm t1 ihe 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 ft1bm 95m30 ampr+ki mtable 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 curm10t+pmmbr953 k amifrent circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the -)d y.ebts)pf north pole entering first. As the north pole enters the wire, the induced current will be yfdb) .ep)s-t (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 rotat3zlm/r2 vy1 6*urbhbced at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotaz 3 ybh/ 26c1burm*vlrtion 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 ang mk(oa9vpu r-;g2z7x hular speed about an axis whose directir2v gzo7m;h (k9up-xaon can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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.s x 12vrtd t)b1 u(kr2u0dbvj2
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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 an jmprd78(s8 yc $emf$ 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 m):) j is9lh5enb5rzydagnetic 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 northwaa0he 4*gxfc m,x9yy*erd at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acr,yyhm0a* 4 9e fe*gxxcoss 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 rot4*i,mzabwo6l ates 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 t51 5j:keijy 6qyy k6joi: k-sjransforms

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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 eachtvlyrt/4o s:hgs76tpm4 , vhugqb;+0 second. The frequency of the hqst,mo4:tvps bghy; 0r6tu7+/4lg v $emf$ 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 dev:15lss ;5:qu/yum v omrwj+yvice 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 device2ob fgf:9j+v vot6e5z that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primne f8z6*l hvvmlz6* j1ary coil then it is a1h 6v* ej*mlnvlz6f z8

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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 thexfy *.ldtkxx7u b/u6y86 uj9px l:f qcuq8;j: primary coil contains more loops than the secondary coil then it is all 8*ucft jx8jxq .:uxub/d6f q:9yp;x7y6k u

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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 inpu1ey +/wqj w.emt

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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 circuyhzr fo 2*:a;s9e egly3 92wrbit,

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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 ideal ban8gzs .qv3s2w 5lp(l httery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resihss5g .3p(2znwl lv q8stor 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 ax,k vapk*vvz)f pgcs7d-3j0 ( re connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with ,vkvk*7 (jg 3psda)xf- z 0vcpthe 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 he jh 4)h( -r *t*as1wcmels1vconnected 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 resistan8rsrk*n+ -y85ulimm. u gxo:4 f:ltqg ce 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 r/eossu8m wk+ sbj8,4are connected in series to a battery. The time constant for the circuit represee/sw smur8b o8+j4sk,nts 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 batteled6ya9bv2 k8 i2l ij0ry. The battery is suddenly removed from the circuit. The time constant for of the circ8yb20id ij9k l6alv2euit 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 excepm*t4cq5-.miscab(yc -j r z c(1ui8ctt:

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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 ciry kml87e5p 0lh bcob.4cuit, 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 cir1(9oir kpf4ad cuit, the currentkar9 odf(i4p 1

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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 eeucji01p/ m+ ac circuit changes by what factor when the frequency is tripj+ /iuec0pme 1led?

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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 t6u2z;hyl4l..s jp ji voltage across an inductor is doubled, the inductive re2.4.hlsy ptuj ; lj6izactance 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 uk /r r/ /d/nxrpud.wv7.y* h;aor o1yan inductor approaches zero, the inductive reactance yro /. ;waudvyk*x /rnh u/.porr7/ d1of 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 connecte :qd(hn5 c//wcugr/ gpd to an AC power supply. In this circuit, the currengcp d wqu :(g//ncr/h5t

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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 changes by w qlrn+nhr7+ 6(q d(wilhat factor when the frequency i7rh+nl+q( (dq n wi6rls 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 capacit /v65ecimghzrlzb/ +)or approaches zero, the capacitive reactance of that capacitzrb6 c)m/h zv i+5eg/lor

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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 vo;j,udhf-h yb -ltages of the inductor and capacitor in a -,juyh;b fdh-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 circnq :9 1hwf du5fqovxm+8 drl::uit 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 impedance of the circuit increases if R increase.qob3yjifj(q mmnut 18 :w 7b4s. When is this state3.17 u bijn(84m:j qobfyqwmtment true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incre c 0k6 4ks*r9myl/ubcdases 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:/ahnj w1 n3rxh fy.c- 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 LRC series circui/l3hq 4) 4l0lgmxn8 ozzy)y:u; 4ya9xtn vjmtt, the resonant nhvgz l0z n 4t/m )ylu3:;yjtqamy4)xo9l8x4 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 circui(.i/s5iy b eqyt that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series R(va sqr0jgn8v;r7u4 dq h r l88t,sx(kLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m isif3ui4ikl6 4 o rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop an6ofi43ki i4lu d 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 0.3rr y:r97t (wym1ljvv10 m is rotating in a uniform magnetic field of 0.20 yvjrl9wt7 3v1rr(y :mT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating inbdh 6 7xc3m4 c-abiru0skx n(*0te0 er a uniform magnetic field of 0.20 T. Find the magnetic fluxa7uxn4d -terk xicc06sm he(0rb*3 0b 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 zvt ;w7 mw8j)1 en )aggg6zs/ jsv(i0aof an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes 8zvvckc /q6 d:diinn./p3 kd i, (of;ifrom $4.0 \times 10^{-5} \; Wb$ 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 2v- li* */1-m pnddqfnq entd*800 turns 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 0.50 T to 0 in 8.0 s, find the average vad q *8/ndpe-imldnv-n1ft* q*lue of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area2te 0zl xnpp 0) d-0b/annw,kp 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 u )o 8 6a9r3+lsfzubeland area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 8j),mb:ci f u j(u8ruij4cdf1m flies horizontally at a location where the downward component of the Earth's magneticj ju,(18c:jfuf 8c ubd)mri4i 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 lgi s(56;wvnb that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its g5livbnsw(; 6ends 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 loops and a cross-sp l rj,3gkn23vectional 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 ;h2xdkbtn)co ng+ ds)n/6u)-h-s ebe 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each9vcr0eyd 4x6i ly:)ha loop is 12 cm lon yld:9ia4yv c60)xre hg 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 the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ar;mlvep;j1k dtqxf tx4/n i1p+sq p/2z) 5w1 mrea $0.090 \; m^{2}$ 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 generc0p)sc3l vdl7jl i3mp6g 9,lvator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. Ifp6 l33gm7i ,0sll cp c9vvdl)j 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 g /t/lr tqk8pq8enerator 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 motor operates on 4suay 3wf.4f i$120 \; V$ 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 motor1 8khkxr*7 t0zj(xa/xr c+ bnp have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generc+kx0* 7rp8 takr1h xn(b/jxz ates 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 connex+-d k 4g 39u- v7ufslp7xhc.0lwcloljgvp76cted to a 24-V power supply. The operating current is 1.0 A. Wl+x39 v-k-lgh sd0c 7 6gulvp4l7 wuf.cxpoj 7hat 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 conr 9u4oe9v9ki pnected to a 24-V power supply. The operating curr9io9uvkp 4 e9rent 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 a/ o.o/ ztp8piis connected to a 24-V power supply. The . /z/t8popaio operating current 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 2ves-ga +fw1oneeded 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 primaryi rz:s7f xv: m8u(l*y-yoixj2 of a transformer causes 14 A to flow in the second* l:vi z:fmioj(-82yurx xsy7ary. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are ndvay;-s b --s 3ho:z4ha;vjdwecessary in a 110-V primary if the 24-V secondar:y-haob jds;-h d;savv34w z-y has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil anlvmwvld.c p6c(8n- :(pui 6n od a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the8c( dl: v6u onlvinp-6 c.(pwm 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 primarsae5i6urg2kjusq 7e5, c)g* e y of a transformer. Assuming 100% efficiency, how many amps at 24 Vi c7 )5segs e,ukr6 *ajgu5eq2 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 m fmt ,iz1njf)3q+iu;x A. The primary com ,fz;ftq n3i )x1jiu+il operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns +a6pqpq 4ypq+71ed u mon its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is ap7 4mqe6 p yaqp+pu+q1dplied 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 on its primary coil and 300 o/6joa3u 7 sx0mpd d(iturns on its secondary coil. If 120 V at 2.0 Ap3jix(0 o7mdu 6osa/d 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. 2ye4lwoljs2 ;k1: 5 fn0rhelg If the input current at the primary is 100 A, we can expect the outputsgh5 rky0ll 2fe1 wlej2;4on: 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 /rksa9*pz/1t zjav ji4f f,1jo1pp*xand its secondary has 200 turns. If the input voltage to the primary *pzia1*1pvj/t kff , xpzj1or94aj/s 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 ,caii dq /qhg2pj ;5ous,.t4e100 turns and its secondary has 200 turns. If the power input to the primaryashio,gi.c, 4djp; u /2tq5e q is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The l+x9k,n9dbb:ow k ho2en, l6vvoltage 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 thk neo v,nwbb9,kd 9 h6olx:l2+e 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 voltahoeu t0 yb4j m6 b.fw+gi,-d3cte1h2age is usually stepped up to 4500 V by a transformmo6 w0, h.y h2 3utecdajg14bftbe-+i er 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 current at 120 V. The voltage is usually y:xc eke2 kt50stepped up to 4500 V by a transformer and transmitted thry2 kce 5txke:0ough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanc0 g,, prigiif+3 e(zxke 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 stepi(xgi+, fk3r,0iezp g ped 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 line2w )l3wqq4jvj 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a tral3 4jwv qqwj)2nsformer 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. Ho-im rywz 4cldo e-(f/8w much less power would be lost if the power were transmitted at 308 w-emrl-c(/zofy4di00 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 20 A. It ihxzuj8a+ 5 xvf2p+(k10b ofvl s 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 1v x of05fux jl(hzab+v8p+k2is 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 carrie:x,3kc hg3ndzs a current of 5.0 A. How much energy is stored in the coil's magnetic g3d3h: xknzc,field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H indumk020h +yv(b mlaxbb+ ctor. What is this circuit's time consvkb 0+ lbyh+mmx0(a b2tant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 124plxqwhw (5, l0 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 1h3jfau m3 xyk;bqxltlj)12 0a 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 tlf her4+kwk 74he lampr+7wlk fkhe44?

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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 sqjn6ifb)xtt*n3 nu.o9z: 1q-vsdo- a upply. What is the peak current through the resist6 vn*):t bou1q-zanx .o-ij sqt9n3dfor?

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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 co/ zyw7re c/6pw;zkws; nnected to a 120-V ac power supply. What is the power dissipated in /yc pze w7wz;wkr6;s/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 zq-rg;om8-a sup b8w:50-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 resistoral (b +e.rs3wm is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is u6dz zv d8 6o*1k69mzud2 wyhn obt8(c$I = 0.80 \sin (240 t)$. 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 inductu upm.yu,8 48vntc mo 3w2zn+wnp y99for 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 reactan dww882o p wnkc6tce6(ce 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 wil)j,tu9tcw 9qa l a 14.0-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 necessary for 157 W of in dco 2d)7oq*qnductive 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-mnlxb lb u;7k lkabxcr+78)o: 9H inductor when 120 V AC at a frequency of 20 kHz is applicbn;bak blx8u9lor l+7 ):7x ked 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 110e 7yb z*l vw3..uzw(ne-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 cap uu0)386bd pr9 pcrvllacitor 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 reactan wudh-w*5dq 43k*3 sid ghaex6ce 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 capacito 2f9r(oy - 7qunkkk+/sagj5jk r 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 ,+pwhqch6f y *100 W? +h,h6y*cwfq p

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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 capacitorapdq)8 xl*fh/: xnkk, 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 circux o ho);bu2t5tit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 tx)obh5uo2t;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 15eywpd3awt:)n*7jwoilj gy 4,l -3(zh 00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are(37ji ,:old-yyng twp* 4e azwjh )lw3 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 r 3va-.w7/euv b:-0n rnqihzpbq bgh.fu:,r/f esistor, 20-mH coil, and 1.0-mF capacitor are fr .q7uqv3,r fhug/-b/- hn npiw:v .b:zba0econnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in serie hool t 2:/0k1av;j0 woczmok;s with a 20-mH inductor, what is the impedance at hkoo/w v; mok01toj20c:l z;a 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series w5zg u 5nm d37/xyuabb4ith a 20-mH inductor, what is the phase angle at 10/4muzn 7 35ydugxb ba500 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 witmzg3pqo w1w/ /h a 20-mH coil and 1.0-mF capacitor fo 3mwp 1goz/wq/r a total 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 series w8k.;vcf- jp2dby4de0nkvh* ghobj ,: ith a 100-W resistor and 15-mH coil to get a toc- h j8p4j.bnk2 b 0;gvk *ohyv,fded:tal 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 sk zl yc hfbm*6hx0qvvicf83 q-(.(ks (eries with a 450-mH inductor at 5000 Hz for a total impedance of 40000 s-(*cq vfizc6m 8kbx hq.0 kf(y(hvl3W?

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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 resisr.87wzkmgc- dqimy *p)dt,l.tor at 1.0-MHz for a total impedance of 150 k).,km7d tprdg z-yqwcm8 .*il W?

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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. y pcgt i-d3vvcab,c+vi16e37What is the impedance at tvgd+,bi pe icav v16-373yc c1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kz;/idm4d 9 hv:pfde q6Hz for a total i9;46 d:pvfmdz qih/ dempedance 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 neede70klii:55c;oyray:a3 py li ed in series with a 10-mF capacitor at 1.0 kHz for a phase angle o;pi 5kl 50lae:3ir iy 7ycayo:f $40^{\circ}$?

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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 303 ;-5jjxh) lw,a3d dqbv 7pl)l(swsro-W resistor at 1.0 kHz for a total impedance of 4b5xa lsrq-3;vow s3l(djw,plj)d7 )h 5 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 1 l9ong8vozl 7mdyc/k /y0j/9d k e+vv:00-mF capacitor at 120 Hz. What is the phase ang80+9d v/e/7gk n/ylojl :dyvczvm 9okle?

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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 150 g y;b-25aot gm-nl2yt0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conneg ybg a;m2-o5ty2n l-tcted in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, ano my1sigx,t7+ d a 0.350-H inductor. The cis+o1m ,7igxt yrcuit 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 capa ckr ,fk*gge-, 3jr/jqcitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in s,rg/ge*j qr3-fkk,jceries to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-;8d tx2 w kw 4daj-u:g8ufa8qeW resistor, a 10-mF capacitf2qdj:gtwx ue8udwk8a; 4a- 8or, 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 necfms mk72ua3*t essary in series with a 500-W resistor for a phase angle of2 sf*mamkt u73 $40^{\circ}$ 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; n jka-un4/9qhc; phh mF. At what frequency should the circuit be driven in order to have9;njhkcn4h u -;pa/ qh 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 resistkfois/yl k i* ck+2nez(-00kyance, 15.0 W inductive reactance, and 10.0 W0y2*fenkk k ii kz/ys(o0+l c- 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 AC ci,b/z vk4chb3e rcuit 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 impedanc)iewaof*.- jc5lt y 9ie of 60 W and a resistance of 30 W. What is the power faci.le)yfi*jt5 cwa-o 9 tor?

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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 f2q:gsyl0 ht 3uor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-: gy32slqh tu0Hz 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-j 8ul+hb 6qso-hb3)si mF capacitor and a 15-mH coil in series?i+3boshhqb) lj s-8u6

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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 s:l7d,zyc rxk,jhv36 r eries with a 4.7-mF capacitor for a resonant frequency of 10 kHz ,d hrk:7rjvy6,3 xzcl?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant frequi623 45vg.ldf4thh 7;lgthh anw e6kaency ohgfk34h t2a5t 47;lahnd hg v i6.ew6lf 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor) pur1,k 0domh)8vhew and a 40-mH coil if the resonant f1ew v h,o)pkhm du0r)8requency of the circuit is to be 1000 Hz?

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