09.18: A wire has a conventional current I zmtg, di1z3 0cdirected to the right. At the instant shown in the figure, an electron has a velocity diretzcg,0 13imzdcted to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the fi-6 w o;1eyp7w,;4yc fvao) bje4uq5 moewgik/ gure, which choice best describes the direction of the ;fw6mu c4qyjp,a e14-ow5g bev y)/7; eiokowmagnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional cpuz, ,h5k 0 g-uav1yzfurrent I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right tow yp,uazgkhvf ,1u- 5z0ard the wire?

  13.30: Electrons flow to the left09 ozrud6dv 70 :dhwsc in a wire as shown. For the proton moving toward the top of the p0:d d760zdu wr9h vcosage at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional c 2s7z;:d5ky rsmzii)fneu- ,g urrent I in a long straight wire flows in the upward direction as shown in the yzn f -ekz, isi)s2:5 ;ugrdm7figure. (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 c;u+m69tyqeynx - bck9rztv wb p9w1;6onstant speed enters a uniform magnetic field whose direction is perpendicular to the particlet9;9rmt9nkec1bwvb qz-yp6 ;x6uw+y ’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform maa*bikj z80i+pk0 krp 5bv4,cwgnetic field whose direction is para j+vk0p4wb8r 0cb5i*zp,ik kallel to the particle’s velocity. The particle will

  03.34: A positively charged pa g5:r z: ry gz4rhqnid-c4+ky9rticle of 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 magnitude y4+:5g: n4k-rrq y gzhzc9dirof 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 bk;zi)a fr+y o(mlc7jx9o3z -ba/d rp6jfy 29locity 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 page. What is the direction of the electric field in this bmalajc f +d /r2 9jz)k 7xpfoyz;ib3o(y r96-region of space? Ignore gravity

  04.14: A positive electric charge of negzu iotm7 +)6(fq se(bgligible weight is released from rest between the poles of a horseshoe magnet as shown. Wh iztq7(( uf)ogsm b+6eat would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in t*qn) 6; vqnwrlhe plane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page asnqql6vn* ; rw) 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 moves pf1 v++vxb8c 6ybxem7 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 r;,wzgeo7 * kcu:mh6wm travels at a speed v in a plane perpuw:k;ogh7w *e z6 ,crmendicular 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 time?

  97.28: An ion with charge q, mass m, ang 7ylj7 4y4bo5j71oxasrmiu. d speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchanged, w7rol7j 4 s4 gybma1y.iux5oj7hat will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a unyu7.v mazi6,pcza : 5eiform magnetic 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 ofa .izpyeamu 6 ,c5z7:v the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetcv9 7y 6regcv2ic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantrgv6ec97c y v2ities must be the same for the two ions?

  02.15: A positively charged parp5:dgp* kxf gtf;x6 0lticle moves to the right. It enters a region of spac:fgp x; *pfgdk05ltx6e in which there is an electric field directed up the plane of the paper (see figure). In which direction does a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass ev,bc(5ued2 zk09:t b2hpty k M and kinetic energy $E_k$ 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 3g.a kqh3ooi, g15tr echarged beta particles is commonly determined byoqi3eh. grk 1atog5,3

  09.27: A proton moves straight up the plane of ib;6n,)yd94. ybb :fkvao2zj.suf p n this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must there be a cooj:afibfn 6 y);.n4.v2yu dbbk9,zps mponent of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the pagow pr*ow9t;a;e through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electow; tw 9ra;o*pric field in Region 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 chargqo5 l;y/n,lk: m5o+ki 3ckggce moves with constant velocity through a region of space containll5kg 5koc;nigm +qkc3/o, :ying 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 +-m5yy ih r6ty7i.mi lconstant non-zero velocity 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 direction of the magnetic field and the direction -li.hr6y tim7+ yimy5 of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.