Prove that the force exerted by one hemisphere on other of a uniformly charged sphere is F=K(3)(Q^2)/16(R^2).?

Prove that the force exerted by one hemisphere on the other of a uniformly charged is F=K(3)(Q^2)/16(R^2) where “Q” is the total charge on the sphere & “R” is its radius and K is 1/4π(ϵ0)