Question

An electron has mass m and charge e if the electron is accelerated by electric field of E, then velocity of electron after traveling a distance d is?

Answer 1

Simple

By equations of motion,

$v ^{2} = u {}^{2} + 2as$

u=0

a=eE/m

s=d

v=sqr(0+2eEd/m)

v=sqr(2eEd/m)

=>v=sqr(2eV/m)

where e-charge of electron

d-distance travelled

E- external electric field.

V-potential difference

sqr() -squareroot of

Hope this helps you