Question

An empty glass jar is submerged in tank of water with open mouth of the jar downwards, so that air inside the jar is trapped and cannot get out. As the jar is pushed down slowly, the magnitude of net buoyant force on the system of volume of gas trapped in the jar and the jar.

A. increases
B. decreases
C. remains same
D. information is insufficient to draw inference

Answer 1

Correct Answer - B
As the jar is pushed down, due to increases in hydrostatic pressure, volume of gas trapped decreases. Hence net bouyant force decreases.