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
- A$M{L^{ - 1}}{T^{ - 1}}$
- B$M{T^{ - 1}}$
- C$ML{T^{ - 2}}$
- D$M{L^{ - 3}}$
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