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Dear Veeru,

For the electron to travel in a straight line, the net force must be zero. This means that the electric
force equals the magnetic force
q E = qvB
B = E
v
We can now find the field and velocity in terms of given quantities.
V2 = Ed
E = V2
d
= 100V
20 ×10−3m
= 5000V / m
1
2
mv2 = qV1
v = 2qV1
m
=1.87 ×107m / s
B = 5000V / m
1.87 ×107 = 2.675 ×10−4 T

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