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

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

Electrostatic Potential and Capacitance

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 $q$ is given by
$V=k_{e} \frac{q}{r}$
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.