Question

One soap bubble A has radius R, another bubble B has radius 2R. The two come in contact to
have a common wall. The radius the curvature of the common wall would be
1) 2R concave towards B
2) 3R concave towards A
4) 3R convex towards B 4) None​

Answer 1

Option 4 is the answer

Explanation:

• Soap bubble A has radius R, another bubble B has radius 2R. The Radius of the curvature of the common- wall when they come in contact is 2R concave towards bubble A. So option 4 is the answer.

• When two soap-bubble of A and B will come in the contact then the contact area will become bulge towards the bigger-sphere. air-pressure inside the bigger soap bubble B will be lesser as compared to the smaller soap bubble A.