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A soap bubble with a radius 'r' is placed on another bubble with a radius R . What angles are formed between the films at the points of contact?

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120⁰

60⁰

150⁰

90⁰

answer is A.

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Detailed Solution

Contact angle is angle between the tangents of two surfaces at the point of contact. To maintain the bubble at equilibrium, the angle between all the surfaces must be equal. Since, there are 3 angles, each of them will be $120^{°} .$

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