Sol:

As given options:

(A) $$2\Pi \rho_{2}gh$$

(B) $$\frac{r\rho_{2}gh}{2}$$

(C) $$2\Pi r(\rho_{2} – \rho_{1})gh$$

(D) $$\frac{r}{2}(\rho_{2} – \rho_{1})gh$$

The correct answer is (D) $$\frac{r}{2}(\rho_{2} – \rho_{1})gh$$

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