A spherical ball of iron of radius 2 mm is falling through a column of glycerine. If densities of glycerine and iron are respectively 1.3 × 103 kg/ m3 and 8 × 103 kg/m3 , h for glycerine = 0.83 Nm– 2 sec, then the terminal velocity is
(a) 0.7 m/s
(b) 0.07 m/s
(c) 0.007 m/s
(d) 0.0007 m/s