In the bottom of a vessel with mercury there is a round hole of diameter `d=70mum`. At what maximum thickness of the mercury Layer will the liquid still not flow out through this hole ? `[rho_("mercury")=13600(kg)/(m^(3))]`
A. `T/(r rhog)`
B. `T/(2r rho g)`
C. `(2T)/(r rhog)`
D. `(4T)/(r rho g)`
