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Q.

If the current is halved in a coil, then the energy stored is how much times the previous value?

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a

12

b

14

c

2

d

4

answer is B.

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Detailed Solution

U=12Li2, i.e. U2U1=i2i12=122=14⇒U2=14U1
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If the current is halved in a coil, then the energy stored is how much times the previous value?