Q.

An electromagnet has stored 648J of magnetic energy when a current of 9A exists in its coils. What average emf is inducted if the current is reduced to zero in 0.45s?

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a

320V

b

620V

c

260V

d

230V

answer is A.

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Detailed Solution

energy stored in the coil is 12Li2=648                   i=9A L=16 H induced emf = -Ldidt= 1690.45=16×20=320 V
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An electromagnet has stored 648J of magnetic energy when a current of 9A exists in its coils. What average emf is inducted if the current is reduced to zero in 0.45s?