Question

A soap -bubble with a radius 'r' is placed on another bubble with a radius R(figure).
Angles brtween the films at the point of contact will be:

• A. ${120}^{\circ }$
• B. ${30}^{\circ }$
• C. ${45}^{\circ }$
• D. ${90}^{\circ }$

Answer 1

The correct option is A ${120}^{\circ }$