Answer :

Since electric field is a conservative field, the total mechanical energy will always remain conserved.

When charge is at rest, the initial Kinetic Energy (K.Ei)

When charge starts moving, the final Kinetic Energy (K.E.f)

Here, m is the mass of the charged particle and v is the velocity of the charged particle.

Ui denotes initial potential energy while Ufdenotes final potential energy.

Since total mechanical energy is conserved

We know that the LHS of the above equation is greater than zero. Thus, the RHS is also greater than zero.

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