Question

If electric field in a point is zero, is it possible that the potential of the point is also zero?

Answer 1

Yes. That's very much possible.

Explanation:

The electric field can be expressed as the negative of the gradient of a potential function ,

`vec E = -nabla V`

Where `V` is the potential function.

A zero electric field at some point implies,

`nablaV = 0 implies V = Const.`

Well, the potential is a constant which may be zero or non zero.