Question

With a pithball lying against a wall we can change its potential by applying the electric field,please say its procedure

Answer 1

Suppose the pith ball has charge q .

As you know electric force is charge into electric field,so simply put another charge near it.

You can apply force on it.

Thanks.
Tripathy

Answer 2

As we know electric force is charge into electric field,so add another charge on it.now u can apply force...