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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

 

(20)

5/5 - (1 vote)

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