C.12Each of the diagrams (a), (b), (c), and (d)
represents a negatively charged particle
moving at velocity v through a magnetic field
B whose field lines are not shown. In each
case the field exerts a force F on the particle
in the direction shown. In what direction must
the field be pointing?
(a) i. Right
ii. Left
iii. Up
iv. Down
v. Toward you
vi. Away from you
(b) i. Right
ii. Left
iii. Up
iv. Down
v. Toward you
vi. Away from you
(c) i. Right
ii. Left
iii. Up
iv. Down
v. Toward you
vi. Away from you
(d) i. Right
ii. Left
iii. Up
iv. Down
v. Toward you
vi. Away from youC.13In each part of this problem, you know a charged particle is moving at a constant velocity, and you are asked to draw
conclusions about the electric and magnetic fields around the particle. Consider each of the cases independently, and ignore
any gravitational effects. In each case, check all of the configurations consistent with the situation, and explain your answer.
(a) There is no magnetic field present. (b) There is no electric field present. (c) There is a magnetic field present, with a
component perpendicular to the particle's motion.
(a) There is no electric field
There is an electric field parallel to the velocity
There is an electric field perpendicular to the velocity
None of these are possible
(b) There is no magnetic field
There is a magnetic field parallel to the velocity
There is a magnetic field perpendicular to the velocity
None of these are possible
(c) There is no electric field
There is an electric field parallel to the velocity
There is an electric field perpendicular to the velocity
None of these are possible
C.14The picture shows the paths of some neutral
and charged particles in a bubble chamber,
which contains an undisturbed liquid heated
above its boiling point. The idea is that
bubbles begin forming on nucleation centers
such as surface irregularities, or particles
moving through the liquid. These bubbles
allow you to see the trails of the particles.
Particles enter the chamber from the left. A
uniform magnetic field is directed out of the
screen toward you. A certain incoming particle