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13. A spherical drop of oil of radius 1 cm is broken into 1000 droplets of equal radii. If the surface tension of oil is 50 dynes/cm

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13. A spherical drop of oil of radius 1 cm is broken into 1000 droplets of equal radii. If the surface tension of oil is 50 dynes/cm, the work done is

(a)  18 π ergs (b)  180 π ergs (c)  1800 π ergs (d)  8000 π ergs Ans. c (6)
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