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
(a) 2 T. L (b) 4 T. L (c) 8 T. L (d) 10 T. L
Correct option (c) 8 T. L
Explanation:
As there are two sides of the film created, the total boundary of the film would be 8L. Hence force of surface tension will be 8L x T.
