A journal bearing sustains a radial load of 3672 N. The diameter of the bearing is 50 mm and the length is 0.1 m. The diametral clearance is 0.1mm and the shaft rotates at 500 r.p.m. If the absolute viscosity of the oil is 0.06 kg/m-s, the value of sommerfeld number is
(a) 5.2 x 106 (b) 10.3 x 106
(c) 15.2 x 106 (d) 20.3 x 106