Question

A metal sphere with its centre at A and radius R has a charge 2q

Answer 1

Explanation:

A metal sphere with its centre at A and radius R has a charge 2q on it. The field at a point B outside the sphere is E. If another metal sphere of radius 3R and having a charge –3q is placed with its centre at point B, then resultant electric field at a point mid way between A and B.

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