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21. A spherical drop of water has radius 1 mm If surface tension of

water is 70 x 10-3 N/m difference of pressures between inside and out side of the spherical drop is

(a)   35   N/m2

(b)    70 N/m2

(c)    140  N/m2

(d)  Zero

Ans. c

(21)

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