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Equipotential surface is a

(a) Real surface

(b) Complex surface

(c) Imaginary surface

(d) Not existing surface

I got this question in an interview for job.

This is a very interesting question from Electrostatic Energy in division Electrostatic Fields of Electromagnetic Theory

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Correct choice is (c) Imaginary surface

For explanation I would say: Equipotential surface is an imaginary surface in an electric field of a given charge distribution in which all the points on the surface are at the same electric potential.

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