Q.

When current through a coil is 0.2A, the magnetic potential energy stored in it is 5μJ. If the current in it decreases at a rate of  2×103As1  then the emf induced in it is

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a

0.05V

b

5V

c

0.5V

d

5mV

answer is B.

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Detailed Solution

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U=12LI2L=2×54×102×106H

ε=LdIdt=250×106×2×103V=0.5V

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