Figure shows water filled in a symmetrical container. Four pistons of equal area `A` are used at the four openings to keep the water in equilibrium. Now an additional force `F` is applied at each piston. The increase in the pressure at the centre of the container due to this addition is

Options

A. `F/A`
B. `(2F)/A`
C. `(4F)/A`
D. `0`

Answer

A

Explanation

The four pistons are initially in equilibrium. As additional force `F` is applied to each piston, the pressure in the fluid at each point must be increased by `F.A` so that each piston retains state of equilibrium.
Thus the increment in the presure at each point is
`/_\P=F/A` (by Pascal's law)`