When a charged particle is released in an electric field, it experiences an electrostatic force due to the field. This force is given by,
So, if a charged particle of mass ‘m’ is released in the electric field it will experience a force in accordance with the above equation.
Now we know that
F = ma —— (b)
Equating equations (a) and (b),
Since m and q are constant for a given charge, therefore E ∝ a. This means the charged particle having charge q and mass m will undergo motion with acceleration ‘a’. The acceleration will be linear along the electric field lines. Similarly, as the field is non-uniform the acceleration of the motion will also be non-uniform.