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Two soap bubbles, each of radius r, coal...

Two soap bubbles, each of radius r, coaleses in vacuum under isotermal conditions to from a bigger bubble of radius R. Then R is equal to

A

`2^(-1//2)` r

B

`2^(1//3)`r

C

`2^(1//2)` r

D

2r

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The correct Answer is:
C
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