A natural feed journal bearing of diameter 50mm and length 50mm operating at 20
revolutions/sec carries a load of 2kN. The lubricant used has a viscosity of 20mPa-s. The radial
clearance is 50$\mu$m. The Sommerfeld number for the bearings is
(a) 0.062
(b) 0.125
(c) 0.250
(d) 0.785