A sphere S₁ of radius r₁ encloses a net charge Q. If there is another concentric sphere S₂ of radius r₂ (r₂ > r₁) enclosing charge 2Q, find the ratio of the electric flux through S₁ and S₂. How will the electric flux through sphere S₁ change, if a medium of dielectric constant K is introduced in the space inside S₂ in place of air?