There are two identical small holes of a...

There are two identical small holes of area of cross section a on the opposite sides of a tank containing liquid of density `rho`. The differences in height between the holes is `h`. The tank is resting on a smooth horizontal surface. The horizontal force which will have to be applied on the tank to keep it in equilibrium is

`gh rho `

`(2gh)/(rho a)`

`2 rho agh`

`(rho gh)/(a)`

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