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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)

A

`rho g sigma H^(2)`

B

`1/2 rho g sigma H^(2)`

C

`2rho g sigma H^(2)`

D

`4rho g sigma H^(2)`

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