The pressure at the bottom of an open tank of water is 3p where p is the atmospheric pressure. If the water is drawn out till the level of water remains one fifth, the pressure at the bottom of the tank will now be

Options

A. `2P`
B. `(13//5)P`
C. `(8//5)P`
D. `(4//5)P`

Answer

B

Explanation

`P+hrhog=3P" "....(1)`
`hrhog=2P`
`P=P+(4)/(5)hrhog" "....(2)`
From (1) and (2)
`P=P+(4)/(5)xx2P" "impliesP=(13P)/(5)`