Q 67. Spot welding of two 1 mm thick sheets of steel (density=8000kg/) 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 in 200Ω,the current passing through the electrodes is approximately
(A) 1480 A
(B) 3300A
(C) 4060 A
(D) 9400A
Answer: (C)
Explanation:
