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12. The radii of two soap bubbles

are r1 and r2. In isothermal conditions, two meet together in vaccum. Then the radius of the resultant bubble is given by

(a) R= (r1+r2)/2

(b) R=  r1 (r1 r2+r2)

(c)  R2 = r21+r22

(d) R= r1+r2

Ans. c

(9)

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