Turpentine oil is flowing through a tube of length L and

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Turpentine oil is flowing through a tube of length L and radius r. The pressure difference between the two ends of the tube is p. The viscosity of oil is given by
η = p(r² - x²)
4vl

where v is the velocity of oil at a distance x from the axis of the tube. The dimensions of η are

1. [M⁰L⁰T⁰]
2. [MLT^{– 1}]
3. [ML²T^{– 2}]
4. [ML^{– 1}T^{– 1}]

Correct Option: D

h =	p(r² - x²)	=	[ML^{– 1}T^-2] [L²]	= [ML^{– 1}T^{– 1}]
	4vl		[LT^{– 1}] [L]