Question

3. A uniform magnetic field of magnitude B = 0.400 T is
directed along the positive x axis (see figure). A positron
(anti–electron) moving at a speed of v = 3.00 × 103 m·s-1
enters the magnetic field along a direction that makes an
angle of 37.0o with the x axis. The mass of the charge is m
= 9.1×10-31 kg. a) Write the Lorentz force (in vector form)
for the general case and the actual case shown in the figure
. b) Do you expect the trajectory to be a helix and
is the sense of motion depicted in the figure correct?
Explain . c) Calculate the radius r of the trajectory
as defined in the figure . c) Calculate the pitch p
of the helix.

Answer 1