09.18: A wire has a conventional current I directed tow lv3nxwf+- f. the right. At the instant shown in the figure, a f.3-nvlf+wxwn 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 best describes ts , s*(,ovufysl+n k9ul/ztr*he direction of ,oyn/u lf+,krus9* vs(s*zlt the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the phoj5ph3x (vkb+oyn /1age with conventional current I shown. At the instant showy5nxok1vh+ o/ 3(pbj hn, 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 t;nn6e6v w o*eho the left in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is t6o;* eehw vnn6he direction of the magnetic force on the proton?

  94.30: The conventional curr4uf;rudb8 h.a tmq)0dent I in a long straight wire flows in the upward 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 headinuqr bf at .8)dmd0h;4ug directly toward it, the force on the proton is:

  95.16: A charged par,uv dl7j f4i1lticle with constant speed enters a uniform magnetic field whose direction is perpendicular to the 7lujv dfl,4i1particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic fl7fika rv*8;) adren;ield whose direction is parallel to the particle’s velocity. The p*aavef ; ;r)in dl7k8rarticle will

  03.34: A positively charged particle of mass M is at rest on(imhj9 q)ct-sr w1uv. vdq u50 a table. A non- zero electric field E is directed into the plane of.qrcjv )15qsutv-m (wdh9i u 0 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 velocitaces g3z2 3pw q24 yldxevok, 64.pi5iy in a region of space that has a uniformewq k e i,24 ospg4z2acix.6dl3vp53y 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? Ignore gravity

  04.14: A positive electric chalmpe pd/n/+ w9m i c)6iojmn ,7tecj-*rge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the directt 6 wj*n,djmm- p+po/nm9i/cel)7c eiion of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 355p:a6 +r earg05chhow 9hpn y00 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of ty:rr5o6h wp+g9a5hhn pa5e c0he 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 moves 9l l2i ;zc x4kdnvc34wwith 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 mas l3//mxra/yp obhxr+ka// q v5s 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 electron travels halfway around the circle. What is the amount of work done by the magnetic force on tl//qxbax/av k 3pyo rr/ m/5h+he electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnet07 ) lagpugr (/9hm+ ozeumvakk:1uu+ ic field B and is deflectpuluvou1h r+ /a 0emg7a(m)+ gk9zu:ked into a path with a radius of curvature 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 a uniform magnetic fie5tzbxoygg );)ld 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 heli g)5o )tgb;zxyum to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic fieldvi3cj3 h9w-jdjii)r77kg; wby:b 8ua . The ions carry the same charge and have the same path radius in the magnetic field. Wbvu);3cwak -i79gjh:jbw37idy8r j i hich of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. I-n r+lxg1w pa qvpg,cix y1:(:t enters a region of space 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 thv: xi-glc npyw: x+rapq1g,1 (is region so that the particle maintains a constant velocity?

  96.40: A proton of mass M an av:t)o/olz;g88kpm b d 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 charged beta particles ;6 2.ygtnlxzjvnej2y:aq( p6 is commonly determined bvex2(.jqny;g6na tlj6 py2z: y

  09.27: A proton moves straight up the plane of this page intky8t / .a/e9pjvi jhq0o a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what taijj9 8yvhq.//0 pk edirection must there be a component of electric field? Ignore gravity.

  08.36: An electron mz+j jn5nxtk7) oves in the plane of the page through two regions of space along the dotted-line traznkj 75jtn)x+jectory shown in the figure. There is a uniform electric 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 charge moves with constant velocity thrzz:bi) qkkbfy5(n 0m 6s.zs4yough a region of space containiks4yb5z nz:mzbqyk if0 .( )s6ng 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 1h5ttin6d 4lanr okwm90 s,1c directly between two long str wr ,4im1tth1c 06l9do5nksanaight 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 of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.