09.18: A wire has a conventional current I directed to the rw rm8+9ty,ug uight. At the instant shown in the figure,ym+u9 uwr,t8 g an electron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice b(7cyp c/1 uslsest describes the direction of the magnetic field at the point P loc/lssu 7cp c1(yated directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I shown. A(dt1e cn)cz ;dt thd cc1t)enzd; (e instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton movinjb qlp+b4kgi7*n rv 94g towabr 7+n4blk* q4gi9vpjrd the top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional currentbk55 ub obi+2o(dhm(b I in a long straight wire flows in the upward direction as shown in the hikou+bbm5( o(b2b5d figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic fi 053vhwhoq:qz eld whose direction is perpendicular to the particle’s velocity.qqz:h3 5v woh0 The particle will:

  98.10: A charged particl .0h-:mlchmgzn 5nr2se with constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particl- lr :mn0gz 5h.2shcnme will

  03.34: A positively charged particle of mass M is at rest on a table:kcq q+ceb 5a54g :3zc4 gtcfv. A non- zero electec c54gvqz 5 :ab4c+tfqck:3gric 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 magnitude 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 velocity in 0s 7dsh3:lv cwxx8u;l wkw 26sa 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 page. What is the direction of the electric field in this region of space? Ignore8 6 s2wwsckx:l73v ulwhxsd 0; gravity

  04.14: A positive electric charge of negligible weight is released from ovm+a hboutft. ;a :u2a+kz* -rest between the poles of a horseshoe magnet as shown. What would be the directi:ovb2h-fa*k. u+ oz +ta ;tmuaon of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page a xqv-kts2709bg k dvz5t an angle of 300 to the horizontal ent-kxv vq9zs2g50t db7 kers a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the instant that the electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron movt1 97r9tm,y;iheag kmy+3l pdes with speed $1.00× 10^3\: m/s$ 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 mass m travels at a spee(x (gufq :r1u.m7edl ed 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 electron travels halfway around the circle. What is the amount of work done by the magnetic force on the electron in this te:ul1 fx r.dgm7 e(q(uime?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic fieldy++h35ekw(yl 9 lsfw5izyh. t B and is deflected into a path with a radius of cifw lz+hw+(9hl yes t.y3k55yurvature R. If a second 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 h e41ai qxa:buo8dgruo .9ze9j6;0rf a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiguf0d1u ro .b:; eja a oxhrqi6ze4899ences the same magnitude magnetic force during its motion, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel p-hp2l4ou hpr 9erpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radlpo492 hu-hpr ius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a regiou fl,o ,tp*5ihn of space in which there is an electric field directed up the plane of the paper (see figure). In which di5up*f, l ti,ohrection does 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 h7pb fskl9hv o::dj:0$E_k$ 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 charged beta particles is commonly b516pl bnq, k6wxu pb9determined by,b6xb61b ulp 5kq9pn w

  09.27: A proton moves straight up the plane of this page into a region z; j4.nm .aywbthat has a magnetic field directed to the right. If the particle is undeflected as it passes through. mya.;bzwn j4 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 through two regions ldu tu*d.j5e.r 17f veof space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed into the plane of the page (as shown). There is*ved ujur1lt57 e. .fd 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 mn 9( jd2ct3auwb)ez. poves with constant velocity through a region of space containd9 j wzu2.pn3)bteac( ing 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 velocity directly betju/lk ) l+zku *;jar 8g+ai(jrween 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.;+zr/alua)lig k8 r+*kujjj ( Ignoring gravity, which choice best reflects the direction 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.