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A soap - bubble with a radius 'r' is pla...

A soap - bubble with a radius `'r'` is placed on another bubbles with a radius `R` (figure). Angles between the film at the point of contact will be -

A

`120^(0)`

B

`30^(0)`

C

`45^(0)`

D

`90^(0)`

Text Solution

Verified by Experts

The correct Answer is:
A
Look at a very small element at the junction of `3` bubbles.
All `3` forces of same magnitude (`:'` surface tension is same) are acting along the tangential directions on the small element.
Now any LAMIE's theorem `theta_(1) = theta_(2) = theta_(3) = (360)/(3) = 120^(@)`
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