A charges particles particle is kept in equilibrium in the electric field between the plates of millikan oil drop experiment. If the direction of the electric field between the plates is reversed, then calculate acceleration of the charged particle.

Explanation

Let mass of the particle =m, Charge on particle =q
Intensity of electric field in between plates = E, Initially mg=qE
After reversing the field `ma=mg+qE rArr ma=2 mg`
`:.` Acceleration of particle `rArr a=2g`