09.18: A wire has a conventih c-(+lz z1wc(:j.zky6niw ajonal current I directed to the right. At the instantjz1zai l(n -w( j+wh.zkcy:6 c shown in the figure, 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 be:m3wc. ny/ pjh : hehki3f2m:wst describes the direction of th h32 /pnmk h:c:.iw:wjfmehy3 e magnetic 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 current I shown. A,ze 3e -q ydnl.tw8x u51n:xqct the instant shown, what is the direction of the z.x: 3yc n8q ,e5tduwl-x1qenmagnetic 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 prot9op8j /k 2z0zsz 2laooon moving toward the top of the page at the instant shown, wha82ozloz9sa z 2j0/po kt is the direction of the magnetic force on the proton?

  94.30: The conventional current I 0qqg*6wk6y brt mc7x,ak 8k5kin 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 heading directly toward it, the force on the proton i0k t k5,g ywxmcq7aqkb 6*86rks:

  95.16: A charged particle with constant speed enters a uniform magnetic fiuqxllkx :8ny;ji+udx 2*t 6b6eld whose direction is perpendicular to the partic + i6xy*xl86ut2:xldk;bq unjle’s velocity. The particle will:

  98.10: A charged particle with constant velociqv386l q 8 vb*asyn2yvty enters a uniform magnetic field whose direction is parallel to the particle’y vvyl 36*qbn8v2 qsa8s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A :zd.ddb7- 7bwwpo8mt non- zero electric field E is directed into bd:7p -ddwomt. w87bzthe 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 a region lk w9xdt-:pc hq;3n;rof space that has a uniform magnetic field directed into the plane of the page. The proton movrpx hncd q;kw-t 93;:les 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 electricw+ yk;89qv4wl fqf ,db charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of t dfkww8yf4qql, +;b9v he charge caused by the magnetic field?

  10.26: An electron movgc6xf9dq: qykhvqar;l- y b;c 0 e9.;ving in the plane of the page at an angle of 300 to the horizontal enters a regk; qyf:0-q.c a;;vld9 y6 rqhgce9vbxion 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 mo)6ira bs /3i)ew *vu*dynta3 (bxjw(rves 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 and0ynl*edfrabt( 94 m6f mass 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 the electron in this time? 0be4ym(n *ff9l6ard t

  97.28: An ion with charge q, mass m, and spe) rpaj/ ehs8yk9jqt8:li au24 ed 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, what will be the radius of the second i2kj:pae/q ri4uja8stl 9y8 )hon’s path?

  16.44: A proton moves in a circular b(of.x:h/t9e-myo vz orbit in a uniform 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 motiy hm(vx.-b/fezo :to 9on, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendq*yqcy 8g5idqh7 .a *ticular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic fitaq*c 8y.g q*yd5qh7ield. Which of the following quantities must be the same for the two ions?

  02.15: A positively charge 2ie0e;zi.jfhd particle moves to the right. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In whie02hiz i;jef .ch 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 M and kinetic energye.t,qi g 4x rgt *atx0+)4l)eo6dpnr c $E_k$ 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 chabk aa(0;b sd:orged beta particles is commonly determined bya(0soab ;bd k:

  09.27: A proton moves straight up the plane of this page into a regionnzp3j dz;lu83 kd,cm* that has a magnetic field3n,c3 d8*; jzzulmk pd directed to the right. 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 taz-8f qzuz nx).8 b-zdhrough two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I direz)xzzqnd u-.b8a z-f8cted 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 hsvn:an v l n8wg:e4-. jur0 z9d8xi9ewith constant velocity through a region of space containinr9uexnsan8 w:nh egv4 :98j z-dv.0ilg 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 dir)( ;gp,4m5qhpl zij(oy6mlq eectly between two long straight wires. The conventional current in each wire hhz (i(6py5lgm,l;p j e4qmqo )as 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.