First slide

Surface tension

Question

A liquid is filled into a semielliptical cross - section with a as semi major axis and b as semi minor axis. The ratio of the surface tension forces on the curved part and the plane part of the tube in vertical position will be

Moderate

A

$\large \frac {\pi (a+b)}{4b}$
B

$\large \frac {2\pi a}{b}$
C

$\large \frac {\pi a}{4b}$
D

$\large \frac {\pi(a-b)}{4b}$

Solution

Length of curved boundary = π(a+b)/2; Length of straight boundary = 2b

$\large F_1=T\frac {\pi (a+b)}{2};\;F_2=T.2b$

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