The viscous force on a small sphere moving slowly through a fluid is expressed as

PHYSICS · Single correct · CBSE · Physics · Units and Measurements · Units and Measurements

Problem

The viscous force on a small sphere moving slowly through a fluid is expressed as F=6πηrvF = 6\pi \eta r v, where rr is the radius of the sphere and vv its speed. The dimensional formula of the coefficient of viscosity η\eta is (a) [M L−1 T−2][M\,L^{-1}\,T^{-2}] (b) [M L T−2][M\,L\,T^{-2}] (c) [M L−1 T−1][M\,L^{-1}\,T^{-1}] (d) [M L−2][M\,L^{-2}]

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