The force $F$ on a sphere of radius $'a'$ moving in a medium with velocity $'v'$ is given by $F = 6\pi \eta av$. The dimensions of $\eta $ are
$M{L^{ - 1}}{T^{ - 1}}$
$M{T^{ - 1}}$
$ML{T^{ - 2}}$
$M{L^{ - 3}}$
The force $F$ on a sphere of radius $'a'$ moving in a medium with velocity $'v'$ is given by $F = 6\pi \eta av$. The dimensions of $\eta $ are
$\eta = \frac{F}{{av}} = \frac{{[ML{T^{ - 2}}]}}{{[L]\,[L{T^{ - 1}}]}} = [M{L^{ - 1}}{T^{ - 1}}]$
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