Consider a vessel filled with a liquid upto height $H.$ The bottom of the vessel lies in the $X-Y$ plane passing through the origin. The density of the liquid varies with $Z$-axis as $\rho \left(z\right)={\rho }_0\left[2-{\left(\frac{z}{H}\right)}^2\right]$. If $P_1$ and $P_2$ are the pressures at the bottom surface and top surface of the liquid, the magnitude of $\left(P_1-P_2\right)$ is :

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.