$A$ large vessel of height $H$ is filled with a liquid of density $\rho$ up to the brim. $A$ small hole of radius $r$ is made at the side vertical face,close to the base. The horizontal force required to stop the gushing of liquid is ...........
- A$\rho g H \pi r^2$
- B$\rho g H$
- C$\rho g H \pi r$
- D$\rho g \pi r^2$
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