45. If two soap bubbles of equal radii r coalesce then the radius of curvature of interface between two bubbles will be
(a) r (b) 0
(c) Infinity (d) 1/2r
Ans. c
(15)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)