Work done in increasing

Question:

Work done in increasing the size of a soap bubble from a radius of $3 \mathrm{~cm}$ to $5 \mathrm{~cm}$ is nearly (Surface tension of soap solution $=0.03 \mathrm{Nm}^{-1}$ ) :-

  1. $2 \pi \mathrm{mJ}$

  2. $0.4 \pi \mathrm{mJ}$

  3. $4 \pi \mathrm{mJ}$

  4. $0.2 \pi \mathrm{mJ}$


Correct Option: , 2

Solution:

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