In the network shown, magnetic energy stored in the inductor a long time after the switch S is closed, is
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a
30 mJ
b
10 mJ
c
20 mJ
d
40 mJ
answer is C.
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Detailed Solution
A long time after S is closed, the capacitor allows no current to pass through it as it is fully charged. But inductor allows full current to pass through it∴ i=123+3A=2 AU=12Li2=12 x 10 x 10-3 x (2)2 J=20 mJ