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4. When two soap bubbles of radius

r1 and r2(r2>r1) coalesce, the radius of curvature of common surface is

(a)    r2-r1

(b)  r2-r1/r1r2

(c)  r1r2/ r2-r1

(d) r2  +r1

Ans. c

(8)

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