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Physics-

General

Easy

Question

When induced emf in inductor coil is 50% of its maximum value then stored energy in inductor coil in the given circuit will be : -

2.5 mJ
5mJ
15 mJ
20 mJ

The correct answer is: 2.5 mJ

$table row cell E equals fraction numerator 1 over denominator 2 end fraction L to the power of 2 end exponent end cell row cell E equals fraction numerator 1 over denominator 2 end fraction L fraction numerator V to the power of 2 end exponent over denominator R to the power of 2 end exponent end fraction equals fraction numerator 1 over denominator 2 end fraction cross times 5 cross times 10 to the power of negative 3 end exponent cross times left parenthesis 1 right parenthesis to the power of 2 end exponent equals 2.5 m J. end cell end table$

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