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 charges are spherical in shape as electric potential due to point charges `q` is given by
`V = k_(e) (q)/(r )`
This suggest that electric potentials due to point charge is same for all equidistance points. the locus of these equidistance points, which are at sam epotential, form sphere surface.