Two solid spheres and of equal volumes but of different densities and are connected by a string. They are fully immersed in a fluid of density. They get arranged into an equilibrium state as shown in the figure with a tension in the string. The arrangement is possible only if
Since tension is developed in the string, we conclude that B has a tendency to sink and A has a tendency to float individually.
⇒dA<DF<DB
Also since system is in equilibrium
dA.V9dB.V=2V.DF⇒dA+dB=2dF
Archimedes Principle on system in equilibrium