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.

Options

A. increases
B. decreases
C. remain same
D. Information is insufficient to draw inference.

Answer

B

Explanation

As the jar is pushed down, due to increase in hydrostic pressure volume of gas trapped decreases. Hence net buoyant force decreases.