What is the viscosity of a liquid that flows at the rate of 11 * 10⁻6 m³/s through a tube of length 1m and radius 1 * 10⁻3m under a pressure difference of 8 * 10⁵ N/m²?

a) 0.001 Pa.s
b) 0.002 Pa.s
c) 0.003 Pa.s
d) 0.004 Pa.s