Equipotential surface: In electric field surrounding a charged body, there exist points which are at the same potential. A surface on which all such points lie which have the same potential is called an Equipotential surface.
For example :-
In the case of the spherical charged body, any number of points situated at the same distance from its center will have the same potential.
The locus of all such points will also be a sphere and the surface of the sphere will be equipotential surface and obviously, there will be an infinite number of equipotential surfaces in such field.
A particular surface may contain all points having a potential V₁, another surface may contain all points having a potential V₂, and so on.
Thus surface A, B, etc as shown in above figure are equipotential surfaces.
Thus surface A, B, etc as shown in above figure are equipotential surfaces.
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