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Question: A liquid is contained in a vertical tube of semi circular cross – section. The contact angle is zero...

A liquid is contained in a vertical tube of semi circular cross – section. The contact angle is zero. The force of surface tension on the flat part to curved part is

A

(a) 1 : 1

A

(b) 1 : 2

A

(c) π : 2

A

(d) 2 : π

Explanation

Solution

(d)

F = T.l = zFFlatFCurved=T(2R)T(πR)=2π\frac{F_{Flat}}{F_{Curved}} = \frac{T(2R)}{T(\pi R)} = \frac{2}{\pi}