The coefficient of viscosity `n` of a fluid moving steadily between two surfaces is given by the formula, `f = nA(dV)/(dx)` where f is the frictional
The coefficient of viscosity `n` of a fluid moving steadily between two surfaces is given by the formula, `f = nA(dV)/(dx)`
where f is the frictional force on the fluid, A is an area in the fluid and `dV//dx` is the velocity gradient inside the fluid at that area. The SI unit of viscosity coefficient `n` is given as.
A. `kgm^(-1)s^(-1)`
B. `Nm^(-2)s^(-2)`
C. Nil, it is dimensionless constant
D. newtons
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Correct Answer - A
`f = eta A(dV)/(dx)`
`eta = (f)/(A).(dx)/(dV)`
Units of `eta = (N)/(m^(2)).(m)/(ms^(-1))=Nm^(-2)s`
`=(kgms^(-2))m(-2)s=kgm^(-1)s^(-1)`
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