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Question

Two separate air bubble (radii 0.002 m and 0.004 m) formed of the same liquid (surface tension 0.07 Nm1)come together to form a double bubble. The radius and the sense of curvature of internal film surface, common to both the bubbles is:

A
0.002 m concave towards smaller bubble
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B
0.003 m concave towards smaller bubble
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C
0.004 m concave towards smaller bubble
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D
None of these
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Solution

The correct option is C 0.004 m concave towards smaller bubble
Since both are same liquid , therefore net radius will be

4Tr=4Tr14Tr2

r=r1r2r2r1

=0.002×0.0040.002

= 0.004

Hence (c) option is correct

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