Q 1580891717.     A soap bubble of radius `r` is blown up to form a bubble of radius `2 r` under isothermal conditions. If `T` is the surface tension of soap solution, the energy spent in the blowing

BITSAT 2009
A

`3 pi Tr^2`

B

`6 pi Tr^2`

C

`12 pi Tr^2`

D

`24 pi Tr^2`

HINT

Energy spent `W = T × Delta A`

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