A container is partially filled with a liquid of density ρ2. A capillary tube of radius r is vertically inserted in this liquid. Now another liquid of density ρ1(ρ1 < ρ2) is slowly poured in the container to a height h as shown. There is only denser liquid in the capillary tube. The rise of denser liquid in the capillary tube is also h. Assuming zero contact angle, the surface tension of heavier liquid is