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Q.

Answer given question

Two identical conducting spheres carrying different charges attract each other with a force \(F\) when placed in air medium at a distance \(d\) apart. The sphere are brought into contact and then taken to their original positions. Now, the two spheres repel each other with a force whole magnitude is equal to that of the initial attractive force. The ratio between initial charges on the spheres is

(a) \(-(3 + \sqrt 8)\) only

(b) \(-3 + \sqrt 8\) only

(c) \(-(3 + \sqrt 8) \) or \((-3 + \sqrt 8)\) 

(d) \(+ \sqrt 3\)

(e) \(- \sqrt 8\)