A capillary tube of diameter 0.20 mm is lowered vertically into water in a vessel. What should be the pressure inN//m^(2)to be applied on the water in the capillary tube so that water level in the tube is same as that in the vessel ? (surface tension of water is 0.07 N/m and atm pressure is10^(5)N//m^(2))

A capillary tube of diameter 0.20 mm is lowered vertically into water

1.	A capillary tube of diameter 0.20 mm is lowered vertically into water in a vessel. What should be the pressure inN//m^(2)to be applied on the water in the capillary tube so that water level in the tube is same as that in the vessel ? (surface tension of water is 0.07 N/m and atm pressure is10^(5)N//m^(2))
Answer» <P>`10^(3)` `99xx10^(3)` `100xx10^(3)` `101.4xx10^(3)` Solution :Consider the MENISCUS of SURFACE of water in capillary as bubble , `P_(i)=P_(o)+(2T)/(R)` `=10^(5)+(2xx0.07)/(0.1xx10^(-3))` `=10^(5)+14xx10^(2)` `=1,00,000+1400` `=10.1.4xx10^(3)Nm^(-2)`