Energy stored in an iron cored coil is 500 Joules when carrying a cert – McqOptions

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1.	Energy stored in an iron cored coil is 500 Joules when carrying a certain current and at that current its copper loss is 1000 W. Time constant of the coil in seconds is:
A.	4
B.	2
C.	1
D.	0.5
Answer» D. 0.5

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