Work done in increasing the size of a soap bubble \( \mathrm{P} \) ...

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Work done in increasing the size of a soap bubble
\( \mathrm{P} \) from radius of \( 3 \mathrm{~cm} \) to \( 5 \mathrm{~cm} \) is nearly (surface tension

W of soap solution \( =0.03 \mathrm{~N} / \mathrm{m} \) )
(1) \( 0.2 \pi \mathrm{mJ} \)
(2) \( 2 \pi \mathrm{mJ} \)
(3) \( 0.4 \pi \mathrm{mJ} \)
(4) \( 4 \pi \mathrm{mJ} \)
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