09.18: A wire has a conventional currenj7w 11epyvgi 7 h8bdq4t I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. Theywj1v7d 1g4h 8beqip 7 magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figureude6v25ix szvd49no oh4q 42n, which choice best describes the direction of the magnetic field at the point P located directly above the center of the magqz 924 u 2vs464nn hoeov5iddxnet?

  11.34: A wire lies in the p pfq3kzst)nhs 36;d)p*x svh :lane of the page with conventional current I shown. At the instant shown, what is the direct6qzs f t*d)3h 3pnk:xsvs)hp;ion of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to th erar4(ss )yqpv+e2n+ e left in a wire as shown. For the proton moving toward the top of the pageasy2 ( + res)+qven4pr at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upwardstjy27 pjk6ssxz jh -x/j/,6a direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heading directlyp z/hjj,7/tj6j sx ay -kxs2s6 toward it, the force on the proton is:

  95.16: A charged partl5*ikx/rd *upicle with constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle wil/ rk**xu5 idpll:

  98.10: A charged particle with constant velocity enters a uniform magnetic f,m8jz .0fch8yr rrz suiq) 43mield whose direction is ryj 0s8mr4)3hiuq .f8zr, m czparallel to the particle’s velocity. The particle will

  03.34: A positively charged particle o t(nd..ri b/ubf mass M is at rest on a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane of the table. What is true about the magnituu(.r/ib. ntbdde of the electric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero ve+fm/orvv ,xx*dvr7z)locity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the pafxovdzx * r)rv+vm/7,ge. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is rx0+ jrmg nu/0peleased from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetgp r/njx0m0 u+ic field?

  10.26: An electron moving in the plane of the page at an anglef 2jru4kup j+ r(d)kl; of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the instant that the electk)j+p;jkurrd u(24l f ron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with speed jo/u s/j1wmx/i akr78 $1.00× 10^3\: m/s$ as it enters a region of space that has only a uniform magnetic field. The electron is accelerated because of this field with a constant magnitude of $8.00× 10^5\: m/s^2$ for the entire time of $1.00× 10^{−3}s $ that it is in the field. With what speed would the electron exit the field? Ignore gravity.

  14.29 An electron with charge −e and ma:r wj29iwk2z: i4b jqass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the el4b2i9 wa::q jwkj2zirectron travels halfway around the circle. What is the amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and spea(y,k/p qhk/f4izt,+ q,cjt red v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a secon,/4/qpr ifjcq y,tkkt(,+zha d ion has speed 2v, while m, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic l+)cqqhqf a9 .ioyo13 field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic force during its motion, what is the ratio of the speed of the hel qlo3cqy q9) a.oi1f+hium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magn+...qm6pfxu q .ume+ fr(rzatetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of tzfp+. u6tf ..mrq . axu(emr+qhe following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. Itjaob2+/c8 05ck y7q8 0jcgxutrb6pti enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction do 7 6y2ug8p0jk bxr0j8ct5+aic ctoq/bes a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic energy /h-nhl *a+ejo w(h a*idoo*5p$E_k$ passes undeflected through a region with electric
and magnetic fields perpendicular to each other. The electric field has magnitude E. The magnitude
of the magnetic field B is:

  04.25: The speed of electrically charv9 uwa b3+ra.pgtfk(/ry9u5kged beta particles is commonly determined byy9rpa 3rtfk aug uw/.+ v(9b5k

  09.27: A proton moves straight up the plane of this page into a region tha/jb ( n 8jk/ cc2lnz 6onx*fpj)dent8,t has a magnetic field directed to the right.8 6bcnn n jn j8tdk)c /*lj/o,(xepfz2 If the particle is undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page tjz; -osyl05hohrough two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Reszyjo5o -l0h; gion I directed into the plane of the page (as shown). There is no electric field in Region II. What is a necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity thro*8+jugo; + sje;eq avyugh a region of space containiny ev u+;je+a;sgo8*q jg both an
electric field and a magnetic field. The electric field is directed out of the plane of the page.
Ignoring any gravitational field, which one of the following choices represents possible directions
of both the particle’s velocity and the total magnetic field in the region of space?

  15.29: An electron moves at constant non-zero velociw7 + lt+srtu )mq,oq.gty directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite directions as shown in the figure. Ignoring gravity, which choice best reflects the direct+w.7) sgo+qtq,t l rmuion of the magnetic field and the direction of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.