Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately

Options

A. spheres
B. planes
C. paraboloids
D. ellipsoids

Answer

A

Explanation

In this problem, the collection of charges, whose total sum is not zero, with regard to great distance can be considered as a point charge. The equipotentials due to point charge are spherical in shape as electric potential due to point cahrge q is given by
`V=k_(e)(q)/(r)`
this suggest that electric potentials due to point charge is same for all equidistant point. the locus of these equidistant poins, which are at same potential, form spherical surface.