A square frame of each side ' $\mathrm{L}$ ' is dipped in a soap solution and taken out. The force acting on…

A square frame of each side ' $\mathrm{L}$ ' is dipped in a soap solution and taken out. The force acting on the film formed is $(\mathrm{T}=$ surface tension of soap solution)
  1. 2 TL
  2. 8 TL
  3. 12 TL
  4. 16 TL

Solution

Length of four sides $=4 \mathrm{~L}$ $\therefore$ Force due to surface tension $=4 \mathrm{~L} \times 2 \mathrm{~T}=8 \mathrm{LT}$

Asked in: MHT CET 2020 (16 Oct Shift 2)

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