The displacement of the shaft at a speed which is 90% of critical speed in microns is

Question

A shaft of 50 mm diameter and 1 m length carries a disc which has mass eccentricity equal to 190 microns. The displacement of the shaft at a speed which is 90% of critical speed in microns is                      

(a) 810                            (b) 900

(c) 800                         (d) 820