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  4. A 100 millihenry coil carries a current of 1 A. Energy stored in its magnetic field is

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Q. A 100 millihenry coil carries a current of 1 A. Energy stored in its magnetic field is

AIPMTAIPMT 1991

Solution:

$E=\frac{1}{2}Li^2=\frac{1}{2}\times(100\times10^{-3})\times1^2=0.05 \, J$