A square wire frame of size L is dropped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, force acting on the frame will be
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a
2T.L
b
4T.L
c
8T.L
d
10T.L
answer is C.
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Detailed Solution
As there are two sides of the film created, the total boundary of the film would be 8 L. Hence, force of surface tension will be 8 L×T
A square wire frame of size L is dropped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, force acting on the frame will be