Water stands upto a height h behind the ...

Water stands upto a height `h` behind the vertical wall of a dam what is the net horizontal force pushing the dam down by the stream if width of the dam is `sigma`? `(rho=` density of water)

`2hsigmag`

`(h^(2)sigmarhog)/(2)`

`(h^(2)sigmarhog)/(4)`

`(hsigmarhog)/(4)`

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