09.18: A wire has a conventi0yi9fx*mgy )gxzo2: nonal current 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 instant isz0*fomx:y 9gnxy )g2i

  14.24: For the bar magnet shown in the figure, which choic (bme46u4ag lyh ,ya0me best describes the direction of the magnetic field at thlgmuyea m44ah,by(06 e 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 sh5er9: -e/4-xahl00 n nxyiuuke3bsxdown. At the instant shown, what is the direction of 45i/x-n0e03-e s9lbexndh auy :k xruthe magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow tocyi82xx r cybgmivs51b 5)o7fy gk0/6 the left in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is ty5f iyyxxb2 )icg07 6vgk1br8 o s/5mche direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upwb si+1t*n( sqjard 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(*ist 1nsjq +b it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform ma*fg,- cy9c zj ltvoa0/gnetic field whose direction is perpendicular to the partfc0/y* 9vog la,j-tz cicle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniformsx,4 q;npy3hv magnetic field whose dirn 4;h3q ,yvspxection is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particleseyt3ja (yiva0s h0xc7 (wm2 6 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 mag6aciea0mx7y s3 2(w(jsvy h0tnetic 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 c52ri xp/p;ag wonstant 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 pw5a;xgri2 p/gravity

  04.14: A positive electric charge of negl gnaw15lb00i betl-5eigible weight is released from rest between the poles of a horseshoe e-w50bg5tbl0an 1lie 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 anglu,qt-eh-)h9kqe)8 gfy( x wqge of 300 to the horizontal 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 the resulting magnetic fghqqeh 8)g9yu(xe-tfw),qk- orce on the electron?

  11.29: An electron moves sc z0sup3d 0*uvev5 7vwith 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 at a speed v in a plane :j* c5:cam z j/gbz1fdperpendicular 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 zbgm/da*cfj5c:z j1: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 enters a magnetic fie dx;hiq 4l) z96efsn1ild 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 th ;ds6ienf9 iz1h xq)4le radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a unif (n2wan89-qsr -rd qnworm magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If ea wnsr2nw-d 9a(q q-r8nch 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 same unifor; ;g08nhdax(ip +bmr 8lzj+wk fr,+ ikm magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must ;,ijwk0 dziakx( 8 +8nh+lg ;br+pmrf be the same for the two ions?

  02.15: A positively charged pavifc79e hi,s w(0i d6ilna6+urticle moves to the right. It enters a region of space in whi+,a(7cuiis9vf w 6ne0iihd6 lch 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 malzonf:ung3 m7zdfo2 3z/v(cl17xw u5 ss 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 charged beta particles is commonly determine +hdrr7hn ugo6.sf i6;a(:tf kd b:fsn +(ia h du7gt;o. krr6h6fy

  09.27: A proton moves straighg1;/ d)nln1d8o w z7+8bdh fyav qlhk;t up the plane of this page into a region that has a magnetic field directed to the w1dhfa7+8y l8d)1/zvg;hnbol;d k qn 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 throughv1c 9:)f2fs10.szvt v yvflag two regions of space along the dotted-line trajectory 0z1 1 vas) 2.fscf:9ftgy vlvvshown 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 consthg js5,qub, c/ant velocity through a region of space containing both anj 5/, sgqhucb,
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 directly b9upfu/ c0xkd8 etween 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 at8u90x /kpdcu f the location of the electron? Any electric field in the region originates from an unseen external source.