An electron in a vacuum tube starting from rest is uniformly
accelerated by an electric field so that it has a speed of
6 x 10Ⓡm/s after covering a distance of 1.8 cm. Find the
force acting on the electron. Take the mass of electron as
9.1 x 10-3kg.
(Ans. 9.1 x 10-6N)
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Asked on December 20, 2019 by
Arpan Dugar
An electron of charge e at rest is accelerated in a uniform electric field of strength E. The KE attained by it as it travels through a distance S is :
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ANSWER
Force on electron =eE
Acceleration a=
m
eE
Initially it was at rest
v
2
=2as=
m
2eES
KE=
2
mv
2
=eES
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