A glass capillary of length l and inside radius `r(r lt lt l)` is submerged vertically into water. The upper end of the capillary is scaled. The atmospheric pressure is `p_(0)`. To what length h has the capillary to be submerged to make the water levels inside and outside the capillary coincide. Assume that temperature of air in the capillary remains constant. (given, surface tension of water = T, angle of contact between glass water interface `= 0^(@)`)

Options

A. `(l)/(1+(p_(0)r)/(T))`
B. `(l)/(1+(p_(0)r)/(2T))`
C. `(l)/(1+(p_(0)r)/(4T))`
D. `(l)/(1+(2p_(0)r)/(T))`

Answer

B