• in a liquid of dielectric constant k and specific gravity 2,two identically charged spheres and suspended from by threads of equal lenghts.the angle between them is 90.in another medium of unknown dielectric constant k2,and specific gravity4,the angle betweenthem becomes 120 degrees.if density of spheres is 8gm/cc then k2 is

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. Number of electrons removes is ??