A soap bubble of radius \( r \) is blown up to form a bubble of radius \( 3 r \) under isotherma...

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A soap bubble of radius \( r \) is blown up to form a bubble of radius \( 3 r \) under isothermal conditions. If \( \sigma \) is the surface tension of soap solution, the energy spent in blowing is
(a) \( 3 \pi \sigma r^{2} \)
(b) \( 6 \pi \sigma r^{2} \)
(c) \( 12 \pi \sigma r^{2} \)
(d) \( 64 \pi \sigma r^{2} \)
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