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习题练习:Physics Unit20: Magnetism



 作者: admin发布日期: 2022-08-20 20:38   总分: 81分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 20:38  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  
  If the north poles of two bar magnets are brought close to sf oj3) q:vh5ueach other, the magnet5 3ovuqjf:h s)s will

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the south pole of one bar magnet is brought near the north pole of a sec-l9pd b c-dj(yond b- bcp-yd(9 jldar magnet, the two magnets will

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a bar magnet is divie1bbbh 55bxy *ded into two equal pieces,

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Earth's geographic Nor1gc6s2:iovqp oa 8y9 eth Pole is magnetically a

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The south pole of a magnet points toward thefz7qft cyf+qq v2s716 Earth's

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric current proz ysra yw*tr(y) 76tn o4f2r;nduces

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is correct?leh96wdgh k( s0ysfohl,j2-ai x fn)k:na 159

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A vertical wire carries a current straight down. m+6v z+:w9eacl3wz mr To the east of this wire, the magnetic field poize+cvr 93zal+mm w6w:nts

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal wire carries a cu15fe eg l2t,:zvdf;wkrrent straight toward you. From your point of view, thee1zk2 ,gfd5tv ;we :lf magnetic field caused by this current

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A current carrying loop of wire lies flat on a table top. n op*as sjd463When viewed from above, the current moves around the loop in a counterclockwise sense. What is the direction of the magnetic field caused by this current, outside th*6jdspo 43 snae loop? The magnetic field

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A current carrying circular loop of wire lies flat on a table top. When viewed nghab11yhj*z nf+f 3xhk:k-n+2ccl +6 ts*n efrom above, the current moves around the loop in a counterclockwise sense. What is the direction of the magnetic field caused bhe1njznf6+lxac*s +n1cyk :tn 2g bkfh*h3+-y this current, inside the loop? The magnetic field

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The SI unit of magnet(;)2 eyzv ,,fotblyx cic field is the

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  1 T is equivalent to()x xk fls*58fwqi. pehn n4b+

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The direction of the force on a current-carrying wire inwe9*bq)pjz8j a magnetic field is described by which of the following*bq 9j)p jw8ze?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The force on a current-carriaf*vzz z6d;rgg,d )1ying wire in a magnetic field is the strongest when

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The force on a current-carrying wire in a magnetic fp dpae 2enk.34vu4po w kps/7 4/m-psbield is equal to zero when

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A vertical wire carries a current st n)d:3.jl q4gglj-( skgn 8 j.shfu/pqraight up in a region where the magnetic field vector points due north. Whatql(g8djs4 -lqgu /..)pg fk nnj:hsj3 is the direction of the resulting force on this current?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charged particle moves and experiences no magnetic forgo4 nxmel94vte x9)o/vkq* .hce. From this we can conclude /v*4xmeoql4 okhe)v99gxnt.that

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charged particle moves with a c;s 8bpu5rur8;io x(y constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on tri8u(bxoyrc;p ;su 5 8his particle will be maximum when the particle moves

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charged particle moves across a constant magnetic field.0l sp3dt ad.b8vn;t*f The magnetic force o8v .ds*n0p bftd 3tla;n this particle

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charged particle is injected into a uniform magnetic field such that itghnm39 -z/ ezsx vht+ xa7p/(fs velocity vector is perpendicular to the magnetic field vector. Ignoring the particle's weight,f(93vhnz t-zxe/ha /m+p sxg7 the particle will

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charged particle is observel:6yg/g x1o amd traveling in a circular path in a uniform magnetic field. If the particle had been traveling twice as fast, the radius of the circular path woul / 1gyx6lgoam:d be

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A particle carrying a charge of +e trl z/qnc ciadp2 a:1 hoj33;i2lavels in a circular path in a uniform magnetic field. If instead the particle carried a charge of +2e, the32 a1li pc:ozj;d/l2 qahcin3 radius of the circular path would have been

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a particular instan:tmndn:t 8g/ zt, an electron moves eastward at speed V in a uniform magnetic fiel/mn t:t z:gnd8d that is directed straight downward. The magnetic force that acts on it is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron has an initia an9:cx22d (wlegvf/ al velocity to the south but is observed to curve upward as the result of a magnetic dn9/w2c x vlg:afe2( afield. The direction of the magnetic field is

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron moving along the +x axis enters a region where there is7:1sf (qkxtit.;v70u :ro e1a enm qjbt)lh-y a uniform magnetic field in the +y direction. What is the dkm; th)f i.tu1qev- 7: o0bnalqy(sx: 7j1treirection of the magnetic force on the electron? (+x to right, +y up, and +z out of the page.)

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The magnetic field producedr kr8o5g g1q+l by a long straight current-carrying wire is

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At double the distance from a long current-carrying wire, the strength off 5vnht45)f sn the magnet5s5 4nf )hnvftic field produced by that wire decreases to

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires placed side-by-side on ayczq. m6c*zg/h3e (mf horizontal table carry identical size currents in opposite directions. The wire on your right carries current toward you, and the wire on y(hcz q 3/mfyegz cm.*6our left carries current away from you. From your point of view, the magnetic field at the point exactly midway between the two wires

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires placed side-by-side on a horizontal table carry identd54fef*meng ;jz si: 56+ikn4l rju jnje3 ,5rical current zfn d5nrui f ,e4emrjs*e+jj; ng3 j5:l564kistraight toward you. From your point of view, the magnetic field at the point exactly between the two wires

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires carry equal currents. The magniteypd0 wd lu,*9 ,tre1vude of the force between the wires is F. The current in each wire is now doubled. What is t 9pvd,0 *e1 w,dlrtueyhe magnitude of the new force between the two wires?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire carri c3s)/crw6)jv 9zsnzjes current toward the east. A proton moves toward the east alongside and just south of the wire. What is thws z)vc/sn) c936jjrze direction of the force on the proton?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire lying in the plane of the page2sjk kzkgoo 8 /gke7 p4)1x6jz carries a current toward the bottom of the page. What is the direction of th/78jo6)gkz1 g2pzs4 k kejkox e magnetic force it produces on an electron that is moving perpendicularly toward the wire, also in the plane of the page, from your right?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires are placed side-by-side on a ho9bzr1 +w1raqerizontal table. If the wires carry current awb9zq r +r11ein the same direction,

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires are placed side-by-side on a horh82a2v zb4cpcv)m +no* m+(ga7g mzqeizontal table. If the wi(z gg4bva qc+vo2zm chmma7e2 *8+) npres carry current in opposite directions,

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two current-carrying circular loops. Both are made fchw3xw: /8lshw8r t:x rom one strand of wire and botw8xw 8w3tc:s /rlhhx: h carry the same current, but one has twice the radius of the other. Compared to the magnetic field at the center of the smaller loop, the magnetic field at the center of the larger loop is

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two current-carrying circular .:baupaei il +0k7n f (;sk.itloops. Both are made from one strand of wire and both carryu0.7ai.tibs+p n;: ak(l feki the same current, but one has twice the radius of the other. Compared to the magnetic moment of the smaller loop, the magnetic moment of the larger loop is

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The maximum torque on a current carrying loop occurs when the angle between ta sal(f3vs*c) f.n 9ujhe loop's magnetic mom a9c *f(.nl3fs )vuasjent and the magnetic field vector is

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When placed askew in a mag1bhr*py11j 4:bk6cfu9j b xuhnetic field, a current carrying loop that is free to rotate in any direction wil:j1jfcxp r4y19*b 1bh 6uubkhl experience a torque until its magnetic moment vector

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What fundamental fact underlies the operation ot haohx*8g(d:4bi0j of essentially all electric motors?( goxbdhj4a h:8i0 t*o

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular wire loop lies in a horizontal plane on a table and cai;svci15t+alr;5f y e rries current in a counterclockwise direction when viewed from above. At this point, the Earth's magnetic field points to the north and dips below the horizontal. Which side of the coil tends to ati icey1v5l5r;s ;f+ lift off of the table because of the torque caused by the currents interaction with the magnetic field?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a mass spectrometer a particle of mass9d1hz ff *.rp:cuwl2 t m and charge q is accelerated through a potential difference V and allowed to ente1 *u:d.ztwcffph29rlr a magnetic field B, where it is deflected in a semi-circular path of radius R. The magnetic field is uniform and oriented perpendicular to the velocity of the particle. Derive an expression for the mass of the particle in terms of B, q, V, and R.

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A velocity selector consistd1mt j 5d0r89 cpljuq*s of a charged particle passing through crossed electric and magnetic fields. The forces exerted by these f9mdq 058jjld1pc t *urields are in opposite directions, and only particles of a certain velocity will move in a straight line. In the following, disregard the magnitudes of the fields. In a velocity selector, the particles move toward the east, and the magnetic field is directed to the north. What direction should the electric field point?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-m wire carrying a current of 0.60 A is oriented parallel to ay 8ef9r2su2-e dq; zqs uniform magnetiq9r8dqyf 2s e-u2se; zc field of
0.50 T. What is the magnitude of the force it experiences?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire carries a current of 10 A in a +qc1 zft2vk9z direction of $30^{\circ}$ with respect to the direction of a 0.30-T magnetic field. Find the magnitude of the magnetic force on a 0.50-m length of the wire.

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the force per meter on a 799htjn scevt71n (ujstraight wire carrying 5.0 A when it is placed in a magnetic field of tsvhuj 1ce7 9 tn7j(9n0.020 T? The wire makes an angle of $27^{\circ}$ with respect to the magnetic field lines.

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A thin copper rod 1.0 m long has a mass9tmyrl(jtp 6 )a+jns 5t:uj0s of 0.050 kg and is in a magnetic field of6a5) 0jy:tttn (jlm pju+ss9r 0.10 T. What minimum current in the rod is needed in order for the magnetic force to cancel the weight of the rod?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stationary proton is in a uniform magnetic field of 0.20 T. What is the ; f)a(i/t xzd19xjkwqmagnitude of the maf1wk)ajqi (/x ;d9xt zgnetic force on the proton?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton moving at $4.0 \times 10^4 \; m/s$ horizontally enters a region where a magnetic field of 0.13 T is present, directed vertically downward. What force acts on the proton?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron moves with a 7zv,nis.3rtsw(yd uiz :4+dgspeed of $5.0 \times 10^4 \; m/s$ perpendicular to a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the electron?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton travels at a spee (eu. wpt+h/mego6c2ud of $5.0 \times 10^7 \; m/s$ through a 1.0-T magnetic field. What is the magnitude of the magnetic force which acts on the proton if the angle between the proton's velocity and the magnetic field vector is $30^{\circ}$?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron traveling due north with speed np /jhv 1psn) 1nnt3 ccm9o-a5$4.0 \times 10^5 \; m/s$ enters a region where the Earth's magnetic field has the magnitude $5.0 \times 10^{-5} \; T$ and is directed downward at $45^{\circ}$ below horizontal. What force acts on the electron?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron moves with a speed of v x9joq m6av1c *q7mgxd(62-wg6js a w$8.0 \times 10^6 \; m/s$ along the +x axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of $60^{\circ}$ to the +x axis and lying in the $xy$ plane. Calculate the magnetic force of the electron.

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron moves with a sp3u kyaqk /ipo41ht )1peed of $8.0 \times 10^6 \; m/s$ along the +x axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of $60^{\circ}$ to the +x axis and lying in the $xy$ plane. Calculate the acceleration of the electron.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton has a speed swo:joeb ;8 6qwj4/zfk( x 7cjof $3.0 \times 10^6 \; m/s$ in a direction perpendicular to a uniform magnetic field, and the proton moves in a circle of radius 0.20 m. What is the magnitude of the magnetic field?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A very long straight jw)k5adcv)7aoc6o: iqff d 8a/tc, 3swire carries a current of 25 A. What is the magnitude of the magnetica: c 8s joifv/7d)dq3)akwf5 6oac ct, field at a distance of 0.15 m from the wire?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A high power line carrying 1000 A generates what magnetic field at the groun 0g6c4ybxchq 9d, 10 m away 690g x4chqbyc?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much current must flos9 ;/2lldpqkx/ xdqy.w for $1.0 \times 10^{-3} \; T$ of magnetic field to be present 1.0 cm from a wire?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what distance from a long straight wire carrying a current of 5.0 A is the mpb5qkvfb3,,v sxh:1 eagnitude of the magnetic 15fe skvh, v,3qbx p:bfield due to the wire equal to the strength of the Earth's magnetic field of about $5.0 \times 10^{-5} \; T$?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires carry currents of 10 6)(pezn h nju9cuw /6aA in opposite directions. They are separated by 40 cm. What is the magnetic field in the plane of the wire/np6 6 c(u) nhzae9juws at a point that is 20 cm from one wire and 60 cm from the other?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires carry currents of 20 A and 5.0 *,h*7c bdpua1ax u/eu A in opposite directions. The wires are separated by 0.20 m. What is the magnetic field midu*/ape1 du,hx*ab7 ucway between the two wires?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires carry curre0ks w8 /d) en )fpwc(2tbjphw.nts of 20 A and 5.0 A in opposite directions. The wires h .kn80w2) / w)fbs(jdpewp tcare separated by 0.20 m. At what point between the two wires are the contributions from the two wires the same?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Four long parallel wires each carry 2.0 A in the same direct/sdfov8n-7ew(31goiom y m c9ion. They are parallel to the z-axis, and they pass through the corners of a square of side 4.0 cm positioned in the x- -o1(3ef 7cgimn vmso9ow/8y dy plane. What magnetic field does one of the wires experience due to the other wires?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires carry cud3egi5 mi /pyp;0i7fmsq9f +mrrents of 5.0 A and 8.0 A in the opposite direction. The wires are m; epqmpf3/f+s 7d5 m 0ii9yigseparated by 0.30 m. Find the magnetic force per unit length between the two wires.

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the magnetic field at the center of a circular loop of wire of radiusldzz (hbeb/27 b r*mi2 4.0 cm when a current of 2.0 A2bl*z imzhb2 b ed(r/7 flows in the wire?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solenoid 20 cm long is wound with 5000 turns of ww58y6q pog *f g 0x7ivl1xo;cwire. What magnetic field is produced atq0 o cg7 pvx*x8foyil5ww6;1g the center of the solenoid when a current of 10 A flows?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solenoid with 500 uy4p5 soih;1+r p9gxr.rvwb 3turns is 0.10 m long and carries a current of 4.0 A. What strength of magnetic field will it have at r4h.;9 rg5w ps uiyxp3ov1r+ bits center?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much current must pass through a 400 ow- iy q0cm3m1turn coil 4.0 cm long to generate a 1.0 co-1m wiqy30m-T magnetic field at the center?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many turns should a 10-cm long solenoid ha e ejsk/2ms;1 nbd95b4vxvvr/ ve if it is to generate a $1.5 \times 10^{-3} \; T$ magnetic field on 1.0 A of current?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the magnetic moment of a rectangular loop of w1lgr zrs1j ll;8 j+s6120 turns that carries 6.0 A if its dimensions are 4. j1rl+ ;jzs81 6swllrg0 cm x 8.0 cm?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire of radius 0.50 m is in a uniform magn j7r/zwa5o/nhma6q u)etic field of 0.30 T.zmuoah5nq/7 6 a/rj)w The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is perpendicular to the magnetic field?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire of cr1uvuqkj+tx k *t mt/1(oss-sectional area $0.12 \; m^{2}$ consists of 200 turns, each carrying 0.50 A current. It is placed in a magnetic field of 0.050 T oriented at $30^{\circ}$ to the plane of the loop. What torque acts on the loop?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop carrying a current of 2.0 A is in a magnetic field of 3.5 ofubg4rvj 3z;6)0 skc T. The loop has an3j0sf vczbk 4g)6ur;o area of $0.12 \; m^{2}$ and its plane is oriented at a $37^{\circ}$ angle to the field. What is the magnitude of the magnetic torque on the loop?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire of radius 0.50 m is in a uniform magnetic field of ) vr2u0fqavmi e5()fp,ar- tp(sn gz( 0.30 T. The current in the loop z qt,gv2)( pe 0afm)rvf(n(a5 -suirpis 2.0 A. What is the magnetic torque when the plane of the loop is parallel to the magnetic field?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire of radius 0.50 m is in a uniform magnetic fie qmpcqtf9,r;f;*81gz,:l tgcxjw z8old of 0.30 T. The current in the looprq:o x,l8z ftw8;gf m;1*tzc9 c ,qgjp is 2.0 A. What is the magnetic torque when the plane of the loop is parallel to the magnetic field?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular wire loop qaxo2rvmv9 ncsnx jp1v ef8-t5n942 0of area $0.25 \; m^{2}$ carries a current of 5.0 A. The coil lies in a horizontal plane with the current flowing in the counterclockwise direction when viewed from above. At this point, the Earth's magnetic field is $1.2 \times 10^{-4} \; T$ directed $60^{\circ}$ below the horizontal. What is the magnitude of the torque which acts on the loop?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a mass spectrometer, a single-charged particle (charge e) has x nf-e rb;.6(lj5d x2fu tdg(ea speed of $1.0 \times 10^6 \; m/s$ and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit is 0.020 m. What is the mass of the particle?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A doubly charged ion withft: ay ,ttk4j59f s ts)uirj+/ velocity $6.9 \times 10^6 \; m/s$ moves in a path of radius 30 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton travels through a potential of 1.0 kV and ;tq 2x bl/31zrv3a wwtthen moves into a magnetic field of 0.040 T. What is the ra3 t3x2wql /zrvab;1 twdius of the proton's resulting orbit?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton is accelerated from rest through 500 V. It enter7r6wg g wmj: ;u4ok+hl.rgv9hkbbf1 7s a magnetic field of 0.30 T orb 17glgbw6m9j+rfw ;hg7r.:u 4o kh vkiented perpendicular to its direction of motion. Determine the radius of the path it follows.

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A beam of electrons is accelerated thro7 bey9 f7g8ghbugh a potential difference of 10 kV before entering a velocity selector. If the B-field of the velocity selector ggy7f9ehb 8b7 has a value of 0.010 T, what value of the E-field is required if the particles are to be undeflected?

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