In a liquid of dielectric constant k and specific gravity 2 , two identically charged spheres are suspended by threads of same lEnglish. The angle between them is 90°.in another medium of constant k' specific gravity is 4 angle becomes 120°.if density of material of sphere is 8g/cc find K'

Ans:- k/√3

 

Similar question for practice 

Two small objects x and y are permanently separated by a distance 1 vm . Object x has a charge of +1.0 and y has a charge of -0.1 . A certain no. Of electrons are rem0ved from x and put onto y to make the electrostatic force between the two objects an attractive force whose magnitude  is 360N. 

 

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Arun (askIITians forum expert)