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39. A drop of mercury of radius 2 mm is split into 8 identical droplets. Find

the increase in surface energy. (Surface tension of mercury is 0.465 J/m2 )

(a)    23.4 μJ                           (b) 18.5 μJ

(c)    26.8 μJ                        (d) 16.8 μJ

Ans. a

(12)

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