Answers

2015-06-12T21:35:27+05:30
Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately (a) spheres.
It is because if the potential is considered at very great distance, then the collection of charges can be considered as a point charge situated at the centre of the sphere. 
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2015-06-12T21:39:50+05:30
Equipotentials at a great distance from  a collection of charges whose total sum is not zero are approximately (a) spheres .
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