A glass capillary tube of inner diameter 0.28 mm is lowered vertically into water in a vessel. The pressure to be applied on the water in the capillary tube so that water level in the tube is same as the vessel in `(N)/(m^(2))` is (surface tension of water `=0.07(N)/(m)` atmospheric pressure `=10^(5)(N)/(m^(2))`

Options

A. `10 ^(3)`
B. `99xx 10 ^(3)`
C. `100 xx 10 ^(3)`
D. `101 xx 10 ^(3)`

Answer

B

Explanation

`(2T)/( r) = (2 xx 0.07)/(0.14 xx 10 ^(-3)) = 10 ^(3) N//m ^(2)`
Pressure applied, `= p _(a) - (2T)/(r ) = 10 ^(5) - 10 ^(3) = 99 xx 10 ^(3) N//m^(2)`