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In a liquid, the force required to maintain the flow of layers is 5N, velocity gradient in du/dx, area of contact is 20m^2. Then what is the value of viscosity?(a) 6.25 dz/du(b) 0.15 dz/du(c) 0.2 dz/du(d) 0.25 dz/duThis question was addressed to me during an online exam.I'd like to ask this question from States of Matter topic in portion States of Matter of Chemistry – Class 11

Answer»

The CORRECT choice is (d) 0.25 dz/du

To explain I WOULD say: The formula of force required to maintain the flow of LAYERS is given by the formula F = ηAdu/dz, where η is the coefficient of viscosity, A is the area of contact and du/dz is the velocity GRADIENT. So by substituting we get an ANSWER as0.25dz/du.



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