A square wire frame of length l is dipped in a solution. When the frame is taken out, a liquid film is formed. What is the algebraic sum of all the force acting on the
frame due to surface tension of the liquid? (Given: $\mathrm{\sigma }$ = surface tension of the liquid).

• A

  $4\mathrm{\sigma l}$

• B

  $8\mathrm{\sigma l}$

• C

  $10\mathrm{\sigma l}$

• D

  $12\mathrm{\sigma l}$