Question

A series of concentric spheres are equipotential surfaces due to
a) Uniform electric field
b) Non uniform electric field
c) dipole
d) Isolated point charge​

Answer 1

Answer:

I think it's d) isolated point charge

Answer 2

Answer:

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Explanation:

Isolated point charge​

The equipotential surfaces of an isolated charge are concentric spherical shells.Since the electric field(gradient of potential) decreases with the distance from the charge, the distance between the shells increase with the decrease in electric field and vice versa.