38. The force required to separate two glass plates of area
The force required to separate two glass plates of area 10-2m2 with a film of water 0.05 mm thick between them, is (Surface tension of water is 70 x 10-3 N/m)
(a) 28 N
(b) 14 N
(c) 50 N
(d) 38 N
Ans. a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a