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Two soap bubbles of radius R(1) and R(2)...

Two soap bubbles of radius `R_(1) and R_(2) (lt R_(1))` are joined by a straw. Air flows from one bubble to another and a single bubble of radius `R_(3)` remains.

(a) From which bubble does the air flow out ?
(b) Assuming no temperature change and atmospheric pressure to be `P_(o), find the surface tension of the soap solution.

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