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What is the force required to separate t...

What is the force required to separate two glass plates of area ` 3 xx 10^(-2) m^(2)` with a film of water of thickness 0.07 mm between them ? (Surface tension of water `= 7 xx 10^(-2)` N/m )

A

50 N

B

60 N

C

20 N

D

80 N

Text Solution

Verified by Experts

The correct Answer is:
B
`T = W/A or E/A`
` :. W = F xx d = 2TA`
` :. F = (2TA)/d = (2 xx 7xx10^(-2)xx3xx10^(-2))/(0.07 xx10^(-3))`
` = 6xx10^(1) = 60` N
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