The surface tension of soap solution is $0.03 \,N/m$. The work done in blowing to form a soap bubble of surface area $40 \,cm^2$ (in $J$) is:
- A$1.2 \times 10^{-4}$
- B$2.4 \times 10^{-4}$
- C$12 \times 10^{-4}$
- D$24 \times 10^{-4}$
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