15. A square frame of side L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, the force acting on the frame will be
(a) 2 TL
(b) 4 TL
(c) 8 TL
(d) 10 TL
Ans. (c) Force on each side =2TL (due to two surfaces)
Force on the frame = 4(2TL)=8TL
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a