09.18: A wire has a convenw)(jq-un xse2tional current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the ju qn- (s2w)exleft. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown iuwkm 8o*i6c4cstu.4 in the figure, which choice best describes the direction of the magnetic field at the point P located d68mi*ci c4o stkuw u4.irectly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I shown7yda 6 r/97eszz9rhct. At the instant shown, what is the direction of the magnetic force on the electron that is movih99 yde t6z/ar7sz cr7ng directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton mov l6yenr 42lu4sing toward the top of the page at the instant shown, what is the direction of the mag4462un lesr ylnetic force on the proton?

  94.30: The conventional cur* (6)du o;y0u je: 6riarwsymwrent 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 a66yr y( e0u:s mi;)wo wradu*j distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with cv* 7rt2+pt ;o 44. tipnxiytaoonstant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s ve 7ptv.;* t4itn4iax oyt+po2rlocity. The particle will:

  98.10: A charged particle with consuw9 zj,ja0xfh* g0z/ mh/x:zmtant velocity enters a uniform magnetic field whose direction is parall m*/ gj0,uhhfzz/j9ma0wx: zxel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a tabl4er6kprm w-;m9nj-7u kvl: co e. 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 is7wl mpek9uv;kcj rm -6nro:4- 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 cw m4 f7:gweud2onstant non-zero velocity 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 region of space? Ignore grav2mgufew7 d4 w:ity

  04.14: A positive electric charge o*j n-gr :zvrl4;ahz) tf negligible weight is released from rest between the poles of a hor:rr );hz*lva -ztn gj4seshoe magnet 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 plane of the page at an angle of 300 to the er6q/4u +y3sng2wj/ loz as(zhorizontal enters 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 w3/rz 2 u+6sl4ng(q/ez yajsothe resulting magnetic force on the electron?

  11.29: An electron mokz-+xt+0 w dq.xqda( bwmd,a:ves 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 z3x/9ses;f amcharge −e and 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 tremazxfs; 9s/3avels 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 cr47 blutr l-z:harge q, mass m, and 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, what will be the radius of the seconrrltu7 blz4-: d ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic fieldwy7.wr xy,0q:y2eou kqe+-o3 chkr8y B. A helium nucleus moves in a circular orbit in the ,y.w7qo- k: 2k+eyy83uxrcrowh eqy0 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;9jxjq/ v./n4dstx ) e eijmbpc,)y*m perpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the , tm.4nem;ie*9dbvsjjxx)cj //yp)q two ions?

  02.15: A positively charge5d-xn2:yc z cc0.lnv fi( a/oxd particle moves to the right. It enters a region of space in which there is an electric field directed up the plane of the ncc v (lonxyi 5:.20df-a zx/cpaper (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 Mo +h1az+v,g cm 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 charged beta particli: gm f)j7mw*4rcv12 -ylmhwces is commonly determined b)m4vr w-c: gl2i1cf7ymjhw *m y

  09.27: A proton moves straight up the plane of this page into a(,k *hdr -il/dpn:hun1m pl: m region that has a magnetic field directed to the right. If the particle is undeflected as it passes through d- 1dh* pn:imh(mu nl,pr/ :lkthis region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron movej b0uzl v9r-938enhyh s in the plane of the page through 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 planv09h3-lbn y ujrh9z8 ee 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 through a region of spacj0ct0pag 78 jwe contac8tw jjgap070ining 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-zero58,vf rfrp wv. 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 fielfvr.v5f8pr, w d 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.