Question

1. An electromagnet has stored 648 J of magnetic energy when a
current of 9 A exists in its coils. What average emf is induced
if the current is reduced to zero in 0.45 s?
(a) 320 V (b) 620 V (c) 260 V (d) 230 V​

Answer 1

Answer:

A. 320 I guess OK jahshjsjshshjhsuyvshdbdbcjxjjshshyjajjaiaoaonw