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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a