The equipotential surface of an electric dipole is :

A sphere whose centre coincides with the centre of the electric dipole

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A plane surface inclined at an angle of

45^{o}

with the axis of the electric dipole

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A plane surface passing through the centre of the electric dipole and perpendicular to the axis of the electric dipole

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Any plane surface parallel to the axis of the electric dipole

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Solution

The correct option is C A plane surface passing through the centre of the electric dipole and perpendicular to the axis of the electric dipole
Equipotential surface is a surface over which the potential due to any charge configuration is same throughout.
The equipotential surfaces of an electric dipole are shown in the figure.
Since the distance of each point on a plane passing through the centre of the electric dipole and perpendicular to the axis of the electric dipole is equal, the potential throughout the plane is zero. Hence it is one possible equipotential surface.

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