Physics (AS & A Level) · Oct / Nov 2025 · Paper 14 · Question 12

The diagram shows a stationary sphere that is just fully submerged in a liquid. The radius of the sphere is r and the density of the liquid is ρ. The acceleration of free fall is g. The air exerts pressure P_A on the surface of the liquid. What is the pressure at the lowest point of the sphere?

1. A$P_A + \frac{4}{3}\pi r^3 \rho g$
2. B$P_A - \frac{4}{3}\pi r^3 \rho g$
3. C$2r\rho g + P_A$
4. D$2r\rho g - P_A$

As printed in the paper