09.18: A wire has a conventional currensi r.m1e;.6 pjk5rqo:i fk-* hro-t(syqo (vnt I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at this insta1qmskq:riooh6 v;p*t--(.r( i rfys5e jkon .nt is

  14.24: For the bar magnet shown in t2+xqx n7 olee7he figure, which choice best describes the direction of the magnetic field at the point P located directly above thex7 eqxlneo+ 72 center of the magnet?

  11.34: A wire lies in the plane of the page with conventional xhek9eb94bv49r ;j nocurrent I shown. At tx j94 4v9h noebe9bkr;he 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 sh p2nz6qs jw xr y;n875lm4h2xzown. For the proton moving toward the top of the page at the instant shown, what is the direction q p 2y n5x;4zmx6lwjhz2ns7r8of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upward dk3azdn iw:scnj5q /.*sxu)w3irection as shown in the figure. (Electron flow is downs.wxn) :uqw *jck3/z5d3 anisward.) 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 uniq9j ciwx+.s3nform magnetic field whose direction is perpendicular to the particle nq9.sx+3j icw’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic f*dfiqv l 7+h(p 6v1 6ks*qqukhield whose direction is parallel to the particle’s velocq*(* vv7 fpklihk+q 1h6qsdu6 ity. The particle will

  03.34: A positively charged particle of mass M is at rqnhdr 82. ,gd 1trs;rmest 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 on,rd21.hgq r m;8tsr df 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 re tezlzcc, ;:yynj/k7r nn(b u-3f6f2hgion 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 regi(23 ; c6 :ntrfle-,zfnhyyn b 7ku/cjzon of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from re7s v8ds wit/5vst between the poles of a horseshoe magnet 7issd/8 5wtvv as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the wt g, iuhm,p.qqe spw/2. e1kloxsd- b65i7o(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 ,tide/ w12o hqlsspu6i,.o- .g ke7 q(mwxbp5as 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 wi jt7h0vg)s*idth 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 a1/i14ul6glvcs8 cubmt a speed v in a plane perpendicular to a magnl11 ug cvi 64m8/ulsbcetic 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, and speed v enterss6nygu;9t7h 9w9ke d 2) rsraed4+vzo a magnetic field B and is deflected into a pa+ k4edyws7;e2grutszhr 9dnv 99ao 6)th 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 4.ff- d, qizhnvkl 33korbit in a uniform magnetic field B. A heliukff,3h- nq3k dizv4.lm 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 helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the sameku (b ube)wk99atf7n8 uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities mu 7tnk)u 9e9a8w bfkb(ust be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a regyz uaa(aa q( u;:r9xz7 7ucq2eion of space in which there is an electric field directed up the plane of the paper (see figure). In which (a:a zxrzuqeacu(y q27au97; 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 energybwe icc.. m.cra9o 8y8 $E_k$ 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 commonlzu +c) )0 gzhg 7fvn/yyc9fu:jy determined by9f:n c v+zz h7)cfy/j0y gugu)

  09.27: A proton moves straight up the plane of this page intx(.qtxw4( ,2weul jtio a region that has a magnetic field directed to the w4.uwi x( ,le(t jq2xtright. 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 uca dm.m9kae5j7hah/bq 8u3 l+px7s4through two regions of 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). The4387xmk ae 7aal9m.5/hpsuqchd+ ujbre 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 constana4iw0cq0h 5(c1e6. lji xl brvt velocity through a region of space containing both aner( b4 lc5h ic6 xvjl0iqwa.01
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 j3a0ji (p obc*constant 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 of the electric field that exist at the location of the electron? Any electric field in the reji*bcoj 3 0(pagion originates from an unseen external source.