is subject
to a magnetic field of 
normal to the beam
velocity. What is the radius of the circle traced by the beam, given elm for
electron equals 
.
(b) Is the
formula you employ in (a) valid for calculating radius of the path of a 20 MeV electron
beam ? If not, in what way is it modified ?
Answer:
(a) 
and 
For tracing
out a circle, 
or 
(b) The formula
employed in part (a) is not valid because with the increase in velocity, mass
varies and in the above formula we have taken m as constant. Instead, m 
is
to be considered.
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