We have two charges q 1 and q 2 at a distance d in a di-electic medium with dielectric constant k. What is the force applied by q 2 on q 1 ?

We have two charges q1 and q2 at a distance d in a di-electic medium with dielectric constant k. What is the force applied by q2 on q1? Is there any effect on the force applied by q1 on q2 because of medium?