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What is SI unit of viscosity coefficient...

What is `SI` unit of viscosity coefficient `(eta)` ?

A

Pascal

B

`Nsm^(-2)`

C

`Km^(-2)s`

D

`N m^(-2)`

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The correct Answer is:
B
is the correct answer.
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The coefficient of viscosity (eta) of a fluid moving steadily between two surface is given by the formula (f) = etaA dV//dx where f is the frictional force on the flluid, A is the area in the fluid, and dN//dx is velocity gradient inside the fluid at that area. The SI unit of viscosity is given as :