A soap - bubble with a radius ‘r’ is placed on another bubble with a radius R (figure). Angles between the films at the points of contact will be –
Text Solution
Verified by ExpertsThe correct answer is:
A
Look at a very small element at the junction of 3 bubble surfaces.
All 3 forces of same magnitude ( 
surface tension is same) are acting along the tangential directions on
the small element.
From the law of parallelogram of forces or LAMIE’s theorem
θ 1 = θ 2 = θ 3 = 
= 120º
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