Answer and Explanation:
When a particle is placed in an Electric field having a charge Q and mass M, then it experiences an electric force on it. and it is given by:

This force is the overall force which is responsible for the acceleration of the particle.
We know, from Newton's second law:
F = Ma
and the force on a particle in electric field:

Therefore, from these two forces:
Ma = QE
a =

In case of uniform Electric field, the particle moves with constant acceleration.
This acceleration is also capable of bending the object and to move it in a circle.