Spot welding of two 1 mm thick sheets or steel (density = 8000kg/m3) is carried out successfully by passing a certain amount of current for 0.1 second through the electrodes. The resultant weld nugget formed is 5 mm in diameter and 1.5 mm thick. If the latent heat of fusion of steel is 1400 kJ/kg and the effective resistance in the welding operation is 200μW, the current passing through the electrodes is approximately
(a) 1480 A (b) 3300 A
(c) 4060 A (d) 9400 A