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

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

 1393  205 Electrostatic Potential and Capacitance Report Error

Solution:

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 charge is given by

This suggest that electric potentials due to point charge is same for all equidistant points. The locus of these equidistant points, which are at same potential, form spherical surface.