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The radius of a soap bubble is r. The su...

The radius of a soap bubble is r. The surface tension of soap solution is T. Keeping temperature constant, the radius of the soap bubble is made doubled. The energy necessary for this will be

A

A. `24pir^2T`

B

B. `8pir^2T`

C

C. `12pir^2T`

D

D. `16pir^2T`

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A
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