# 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: