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Two separate air bubbles of raddi 0.002 ...

Two separate air bubbles of raddi 0.002 m and 0.004m formed of same liquid of surface tension `0.7 N//m` come together to form a double bubble. The radius of the internal film surface common to both the bubbles is,

A

0.004 m

B

0.004 m

C

0.002 m

D

0.02 m

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