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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 magnef8 owb)5zz /vqtic 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 that the wuej dqsp4 bi1g-5 rzg :0lb1,$emf$ 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 wha1xj.svdh5x8 at kind of change on the indvx h1d.j5s x8auced $emf$, 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 fiec3+dvy +j e4fo bw13hkh4g0jw)u ;wo gld through a loop of wire produces what kind of change on the gfwo+j3hv d 1hwgw u04)ok4;c+y3eb jinduced $emf$, 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 produce 6xo,;xr+.vjbdndqd y3e3 bjn3s0eg0s what kind of change on the indujnj.x0d; v gs b+033edyq6b,nxr deo3ced $emf$, 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 mnee)ozk :/ v5sc(o. pfagnetic 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 current in ay:x6 5z.wk aehqo rb84 conductor will be that which tends to produce which of the folq5k:byzhr 8ax 64.eow lowing 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 hx /px)dfm:,y hp.+ 2x lw/skkworizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viekkwm sf,p/)xyhl.d:/p2xx w+ wed 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 horizontal table. A bar magnet is held above d3:spa3tf ncvs/)a)s its center with its north p3 sa)dvfpnt:)/sc s 3aole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the uqo3go,k 7l vb;n17t umagnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sensebu7n gqkvu1lt;o3,o 7 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 )uwf6 d/,ccjym/ dj5(ujijy) field vector points straight )j5ujdf //yywui 6c)d c,j(jm up. The magnetic field suddenly grows stronger. When 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 h9b c *vqp) 0ez6:pyy biypi9o7orizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directio 9bpyv eqio:0czyb)* pypi967 n 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 horizonta.x.lfmdl8bu/y- y ;p r7 6dkzrb v0ee7l table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of tbl dexkfy8y/r7druv0-.mz elb67.; p he 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 througdpncn,e++1qj ;ejcsp.f3/h xe *cin-h a loop of wire with the north pole entering first. As the north pole enters th;3q+1x pehn f n/e* cjp-c+sni,.edjce wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an 7my cgg/;r3qwi6 ga8r 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 rotation if the /wagyr6c qgr;73 gim8induced $emf$ 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 rota rnu cdoo pe6jd88m l7m9/gz: -7doo)ated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what ma89m gddoz8/ )c u7onmpjelo-d 7r:6oust 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.-y 5g4eck :i+ycr wz+,sm2dbg
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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 8ig (td1c)hqh $emf$ 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 magnetics3nsw:q 2hm,dnvt bbxg)- :8 g 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 (5d6nsf:sy jdd 0t ,c.6i0fkpmocd+zmoved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrf6 c(0knd d:d0,i js+d5fcy.6 opztm soss 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 at4b5etl s /r+oz 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 tranmu8mi5fc)sxqo3+ k 9 ywuyhkq85/kg3sforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency of wgoh5e +6 /4sxzpxik7the6 zs57egkoxxp+hi/4 w $emf$ 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 tjl jpv6vk5 5*ao

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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 th fug704e-p istat

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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 pr) hgg5:egpnmi ;ohu cdwuuj 2q7( 10423qmhueimary coil then )g:m45euqwm2n1iu 3gdjc; huh uhq 0e( g72o pit 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 than the secsg 0ntcf w;o7+d1hc+h ondary coil then itht+071hdc of c+w;ngs 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 inputlh55d(b om/s i

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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 resonanvwxos:dp*u2) cet1s- t circuit,

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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 con, o4l;k t*w;(elyrd :rhuwv8 it +sw-xnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, t8r,(t-yw+:kw v 4l* wo ;t idxhr;sleuhe voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an+-fdin j dxt,raz7hurj( 2y *1z5d q4d ideal battery of constant terminal v ,(qd5 a2hrzzrdddyj tx fn7*j i+u-41oltage. At the 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 w cu-xpu. c7c07q.8qqv9ojtkpf- 2 hyqith inductance 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 and7q xo,.ddxsjzc-) 8 k w,2ehjr 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. j:ja*t7hr4do x3 b7ng The time constant for the circuit represents the time required for the current tot 3 hjgd4rn *ba7jx7:o 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 battery. The battery n2ukk fnh *ga(.)r; mmis suddenly removed from the circuit. The .2a) nkhk;gm*urnfm ( time constant for of the 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 sf 9e; s0vhs3f;j j:pzyame 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 powezu 8( g9zk )7u,jjmmhir 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 supp, -*mm0g1j slr2umw3b -rw wdlly. In this circuit, the current *-0m rbw1w,3 uslwjml2grmd-

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor gt y9x60l4rj,n3nviidys *kpn)od.2when the frequency is tripleydjnv 6koiy4n.9 rts 0p3xi2 ,*dgn)ld?

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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 thefpy 8gh8 q*gbc6q,( tt AC voltage across an inductor is doubled, the inductive reb h( 8tg8 gtqy,f6q*pcactance 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 anmep ;;c7 b:dz v49wk)olsbm (k inductor approaches zero, the inductivcd v9m zwbp;;ol)e:sb mk4 (k7e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an ACx.m ;9bp 8vxjm1+ usb +hpj,zo power supply. In this circuit, the curreu o.;1+pmjbxx ms9p+8b jzh, vnt

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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 circu 9lubw w5ja((vit changes by what factor when the frequency is tripl a5u(( 9bljwwved?

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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 a3htvj :m: s mgh etv2ozo,d3,y./p 0ppcross a capacitor approaches zero, the capaciey p,h, 3vtvt /s2d:p ojm0pg mo:hz.3tive reactance 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 in55shfxt; 2f,p. r)el5c5rp t3 li6kg oz7rbvfductor and capacitor in a RLC s , sl 6.)xktcrzgi2t 5;prf7ebhv3ofr55 fpl5eries 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 ax7c60eoys-/ o9f(kqfoam l-zu ;) b pus $\cos M = R/Z$, 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 of51pg;tn5x0evoj3 g41mais wj the circuit increases if R increases.in1 pj1aog5m35wxv ;t0g4e j s When is this statement 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 ofd8cw54 )mr d/;y7gaajyj7a /fd d7j phnqu3f / 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 imped 9 :klc0/dxja-vi,ss dance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacittzk 2sa0 yiqu/5u zc/mh*0p (mance both double in an LRC series circuit, the resonant frequency of that circuimsk uq *m5i z/ (0yuapc/tz02ht 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(,crv4fu)j dplq+x ;udc tj6 *,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a serieyxvaa 7z5+rp 9t gles(k;;f7i s RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.)qf qm l4s;by;10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetl;b;yq4qms)f ic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform6gmta/cfni7- magnetic field of 0.20 T. Find the magnetic flux through tg/ m 7nictf-a6he 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 ins:i;yv* 2cq4+ga c9iis f8b wn a uniform magnetic field of 0.20 T. Find the magnetic fln9sygc4q;s :*bvii i c2 fwa+8ux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced frlqpbn386j;r8 mg4u koom $1.0 \; m^{2}$ 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 coif b-) -(prmfqtl changes 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 square frame with sidevl-u48wkj9.4f s:fq ph+hnj d s 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformllq:jn uh .s94 vkfjh-+pw48 dfy 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 turns and an arp5r5 cmhpm,k:ea 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 ands ymo *gxksm7(h *g7f,bo7o p; 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 m flies horizontally ao),hz6jh dyy4o-ih7 qt a location where the downward component of the Earhhoio4yjzy7 )- h,q6 dth'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 rotates at a constant angular velocaztr9,f*v5o4pf,jp 5wxx blp -2e p8 qity of 2.0 rad/s about a verb x ,t4jl-r9xf8f5a5pe ,2ppzp ov*qwtical 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 loops and a cross-sectionaa5 wr)nlshh7im: k2a0l 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 turns of wire3f p1q px(m3xj 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 rects7b2r( xhk pro(b2s 3x ls::ijangular 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 of rotation, what will be the maximum output voltage of this(3xxbsk7:j2bl hs2(rrpoi:s 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 tuiz,-w 2k3odnr rns 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 ;5yewxc),j uq c):h vsrh7gyba91 j+ msimple AC generator with an output of 12 V maximum when rotated at 60 Hz. q xg ry+bh1 cua)v;j)yjsh,w7m:c95e A magnetic field of 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 generatcb uq6w8zzeab xkknq 6h+r:k252kk.4or 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 j0c/r 2in1kmd motor 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 W. The motor opbn gll+hw; v959mk3cferates on 120 V AC, and when running at full speed it generates a backw 9 km9v3f;clb g+h5nl $emf$ 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 cazy: /dz4lh4v- nv;/m -nk ofqonnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current:;44lvydvm- z /z anfhk on-/q?

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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 xd 5wswcs3(c/rn3hxs ;g;et( connected to a 24-V power supply. The operating current is 1.0 A at full s3ccsg( txrds ( ;ex/wh;nws53peed. 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 supqzza, qrb k700qf a60dply. The operating current is 1.0 A at full speed. What is the ba0z7zk,ab 0 qrdq q6a0fck $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltag,ef4ryxdt r u03ja5k7e 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 * bgoe+w7ua1 egafv4m(6 vh4tof a transformer causes 14 A to flow in the secondary. How many turns are in the sec e gmoa4*vh(6v fau7 gtbew14+ondary?

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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 pxpo9 d.nww+7td5 rp 9wds.en0 rimary if the 24-V secon7swe t nxp9dw5o.0. dw9pnr d+dary 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 /p4z9mg1y(se bti69 hvfa mo. of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primab m toge4 61hvyzi(9 a.ms/p9fry?

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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 prim8 /60lp n1gd6ovp3mb um-frb lary of a transformer. Assuming 100% efficiency, how ma lr 6/p0f-vd1lg b6mou3np8m bny 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 transformer provides 7500 V at 1x/9ysl88-:xu v 9yy p2vdn e:l vtk4eu0.0 mA. The primary coil operates on 120 V. What doesntexvye9:8llkx /vvy psy48 9 2:-duu 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 )lc z/0zf)jd f2* x*qb rhqp6kturns on its primary coil and 300 turns on its secondary p **f 0hzb q)rjck/x2ql)z6fdcoil. 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 on its primary ub4,.p rc osoibx24t,coil and 300 turns on its secondary coil. If 120 V at 2.obtx.4rs2 c ,bi4 upo,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 seconda jnlhhi5w3l*, zf-ua5ry has 200 turns. If the input flh l*a,w3n j5-iu5zhcurrent 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 has 100 turns and its secondary has 200 turns. If 2jkstuh 0os )n y.0g07ggjjs3the input voltage to the primary is 100 V, we can expect the output voltage of 3sk0.y7jg)tj 00osgnujshg 2 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 zqji z4htdbg8+c qclvz9:30 5turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecctld izzb4 39h+5cgqqvz8 :j0ting 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 cu;l *u6,j).dhieuvo 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 i)u;v u6u* o ecjh,d.ilf 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 volm+3y w,uffoz 1tage is usually stepped up to 4500 V by a transformer and transmitted through a power line of to ow1 ,fm+z3fyutal 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 i ;-(t )zzv*n+4ontf jvbl )hzas usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is nnnza+)b jh zz*4tot vv(-;fl)ot stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A g )5r d5 woa40xu/jazrlenerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission linelrd54 waau zj/o)r05x, 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 i9dtgh)cy0 he xj:1gb)n +2fc 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 original energy is lost when thc) 1):ht2c+e djh90fiyg gbxne 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.k( cnbym25tvn -xo3 o3 How much less power would be lost if the power were transmitted at 3000 V inso2cnb5y3(nk3 t mvx -otead 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 generator7k b(murg0 (sr is 440 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 po ubkg(rrs0m7 (wer loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in t47sqvz2zt/t(m- s r qjhe coil's magnetitqssjq t4z2- m(r7zv /c 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 conu p+ndkb0;phz 64+)onyl;ik n tains a 6.0-W resistor and an 18-H inductor. What is this circuit's time consta ;zi;6bpnd++nl k) ph 4kn0yount?

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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 voltaido kd0u(yd; ,ge 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 into1(qb36 8qtm r8uw5jq kq4bpr e 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 resisk / tjd4 mf.gdqxxgi2.wqim28cy( 05ctance of the lafd g 5mg0(/q.xmdjc2yxqic8 .kw2t4i mp?

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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 pap)qsrtmh 4j+ (j;or8 eak currem4at( o;rrj+s8 pj)qhnt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is tj o- .(.lz)my pjaj3e:xy7nvr2ve9z bhe power dissipated in the resi -7.vy:)3n zerm(ay oj.lp9 v 2jxbezjstor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through at1li2 hh-jd a* kn-tn0 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 resistor isx8bnelipg;akw 2o v(f0: y95j $I = 0.80 \sin (240 t)$. 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 res 3-u3spw8tqlc istor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hzc q6on8+1k-0 9 oqnh;eg w xwa;xcazl4?

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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 l6e5*j8 6i8rvpj6z dnayq .dm 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-mH coil have 14.0 W of inductivo,e:s2bt jgb7 e reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hzge) bqg75ikwzrzlcq( 5( a6y;?

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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-mHksai7.6h mdn 5 inductor when 120 V AC at a frequency of 20 kHz is applied tak7 mid.h s56no 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 /vjy7sorkd9o v oe 52 hxr(-d4110-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 reacta2 z(xqd rjmi8/nce of a 4.7-mF capacitor 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 i ze4r* 1b7ns:bm czlpwwej 6:(+zxb+f s needed to 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 have a reactance d vgjbz0d/v6x;fxu/ :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 capacito5;kbg pjjx-a n+ 4sj0xr be 100 W?a-+gbxp0; 5 xjjjnk4s

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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 8f-ja)ni;mg2 o jj z,wthrough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series cfabqrt u(),vh.xr 7s(in bl )rd(p(2xircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanc) .q(npbf7iusl(, )a2(xhbrvx rr t(de?

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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 im)6q9.11 emnfteryf;t i fssd0pedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mf esq1)f1mdy est 60;r9f.tinF capacitor 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 1005 s3 rd6 k,uf*f.tfxnd-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?fddr5 s3 xu f.,6fntk*

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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 with a 20-mH inductor, what iaoweoum- * e.lqeo;0 qn0 /ba*s the impedanceleaanmw eqo;0*/b oe0 u-*qo. at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is) uben jwhs27ou1taz o9+7pl7 /ae bv- connected in series with a 20-mH inductor, what is the phase angle at 1000 Hz?bhel ) 9s-7v1uew2u7t b/z7oapnoj+a

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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 izg04c0g.-6 yiv nj tywn a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at -izy0tjn6 gy. wgv40c 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 mb 0: m6xdki+acapacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hzimx 6adbmk0+: ?

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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 asrre5 nc*ie2 9+fl8 iz 450-mH inductor at 5000 Hz for a total im*er+sr59 zniice 28f lpedance 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 series with a 100-kW resistor at 1.0-MHz s:+p(i m wlr0hfor a to 0wm:+hsplir( tal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series wi1wg phxq48-g9y-shy qth a 20-mF capacitor. What is the imped14 8xspqyy 9gqhh-g-wance 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 capacitor a+z3ib aky.1; 7n fok,jrr.jcu t 1.0 kHz for a total .zoj +7bk3j,nr;ka1c ui y .frimpedance 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 sny rxv m-cscptq 7) :c9p-5a0 dl1wjy(eries with a 10-mF capacitor at 1.0 kHz for a phase ympn 7 ws) vtqxpy(ra:jc91cd l-c05- angle 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 resb-w(8hdud-, i6 /rea nvnlb9listor at 1.0 kHz for a total impedancnvd(drl8ba9n ,uewi -6/ b hl-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 1007kv+wq* r tii8-mF capacitor at 120 Hz. What is the phase anglv i8kiq +wr*t7e?

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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 ir3i.* shla v/8xo*nbdf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cona ho3*xiv*l8d .bs /rnnected 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 resistorec kszr;sn(5m,9a 86ln u rp(z, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the r8r p6nunza5(l;,m9 zksscr (ems current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and u*6+mj/kn;uh/ay p i(desag2an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sourcenu ;pgmkde a2j +iasy/h* /6u(. 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 sy0vp.js5 v5w, laem (heries RLC circuit containing a 50-W resistor, a 10-mF ewa,(5pl0 .sj myvvh5capacitor, 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 serip0dq+- btj we8es with a 500-W resistor for a phase angle obj8pd-qte+0 wf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frlhx, s 4: v+cwq00gsicequency should the circuit be driven in order t0ixl qvs+w 0c:hgs ,4co have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuitr7dp 4sw 4t1hb with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is cons 4r wt7db4p1hnected 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 x gssu/i r+eqjp:n5- +circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has a9. -q5+yldje i28ot2eqdly len impedance of 60 W and a resistance of 30 W. What is the+o25qyeql2e .i 9j ldedt8-y l power 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 circui) f,a:kkhpxb8t containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz,fxh bk):a 8kp 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 we64w(do -erkvjzi *) y9zzw5frequency of a 1.0-mF capacitor and a 15-mH coil in series? 9w)kow ij z4(y65ezvrdzwe* -

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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(az7cv nc4, 9p.mzkkt.7-mF capacitor for a resonant frequency of nk(7t4zcavpm, zck 9. 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant fpf(pi7vn3px;:e hc d: requency of 10dfp(n:pexi: cvp;3 7h00 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 t )mwn 74za9j es vh1z:j,3sew30-W resistor and a 40-mH coil if the resonan)h7ssa jn 1:e3zj, 4met zv9wwt frequency of the circuit is to be 1000 Hz?

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