When two soap bubbles of radii a and b (...

When two soap bubbles of radii a and b `( b gt a )` coalesce, the radius of curvature of common surface is `:`

A

`(ab)/(a+b)`

B

`(ab)/(a-b)`

C

`(a+b)/(ab)`

D

`(a-b)/(ab)`

Verified by Experts

The correct Answer is:

B

Excess pressure at common surface is given by,

`P_(ex)=4T(1/a-1/b)=(4T)/(R)implies 1/R-1/b-1/a, R=(ab)/(b-a)`

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