Work done in increasing the size of a soap bubble from radius \( 3 ...

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Work done in increasing the size of a soap bubble from radius \( 3 \mathrm{~cm} \) to \( 5 \mathrm{~cm} \) is nearly (surface tension of soap solution \( \left.=0.03 \mathrm{Nm}^{-1}\right) \)
(a) \( 0.2 \pi \mathrm{mJ} \)
(b) \( 2 \pi m J \)
(c) \( 0.4 \pi \mathrm{mJ} \)
(d) \( 4 \pi m J \)
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