Question

find the potential of point a​

Answer 1

We know that, electric field decreases with increase in distance of the point from the charge (V = (1/4 πε0).q/r2).

So, at r = α,electric field (E) = 0;

⇒ E = Force (F)* charge (q) = 0

But, q ≠ 0 ⇒ F = 0

So, at r = α no force is exerted on the charge.

We know,

Work done = Force * displacement

So, r = α,

W = 0.

dW/q = V = 0