A liquid is contained in a vertical tube of semi-circular cross-section. The angle of contact is zero fig. What is the ratio of the force of surface tension on the curved part and the flat part of the tube?

Options

A. `2 : pi`
B. ` 1 : pi `
C. ` 3 : pi `
D. `2.7 : pi`

Answer

A

Explanation

On curved surface ` sigma (pi r ) ` , On flat surface ` = sigma (2r ) `, Hence ratio ` = 2 : pi `