A metal plate of area 103 cm2 rests on a layer of oil 6 mm thick. A tangential force of 10-2 N is applied on it to move it with a constant velocity of 6 cms-1 .The coefficient of viscosity of the liquid is:
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a
0.1 poise
b
0.5 poise
c
0.7 poise
d
0.9 poise
answer is A.
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Detailed Solution
Viscous force F=ηA∆vx∆y⇒η=F∆yA∆vx =10-2×105×6×10-1103×6=0.1 poise