A ring is cut from a platinum tube having 10 cm internal and 11 cm external diameter. It is supported horizontally from a pan of balance, so that it comes in contact with water in a glass vessel. What is the surface tension of water if an extra, 4.752gwt is required to pull it away from water ? (g=10m//s^2)

A ring is cut from a platinum tube having 10 cm internal and 11 cm ext

1.	A ring is cut from a platinum tube having 10 cm internal and 11 cm external diameter. It is supported horizontally from a pan of balance, so that it comes in contact with water in a glass vessel. What is the surface tension of water if an extra, 4.752gwt is required to pull it away from water ? (g=10m//s^2)
Answer» `7.2 xx 10^(-2) "N/m"` `72 "N/m"` `14.4 xx 10^(-2) "N/m"` `144 "N/m"` Answer :A