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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

 

(8)

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