The force F on a sphere of radius a moving in a medium

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The force F on a sphere of radius a moving in a medium with velocity v is given by F = 6πηav. The dimensions of η are

1. [ML^{– 3}]
2. [ML^{– 2}]
3. [ML^{– 1}]
4. [ML^{– 1}T^{– 1}]

Correct Option: D

F = 6πη av

η =	F	=	[MLT^-2]	= [ML^-1T^-1]
	6π av		[L] [LT^-1]