For a series RL circuit having L = 5 H, current = 1 A (at an instant). The energy stored in magnetic field is ___________(a) 3.6 J(b) 2.5 J(c) 1.5 J(d) 3 JThe question was posed to me during an interview.My question comes from Advanced Problems on Network Theorems topic in division Useful Theorems in Circuit Analysis of Network Theory

For a series RL circuit having L = 5 H, current = 1 A (at an instant).

1.	For a series RL circuit having L = 5 H, current = 1 A (at an instant). The energy stored in magnetic field is ___________(a) 3.6 J(b) 2.5 J(c) 1.5 J(d) 3 JThe question was posed to me during an interview.My question comes from Advanced Problems on Network Theorems topic in division Useful Theorems in Circuit Analysis of Network Theory
Answer» Correct choice is (b) 2.5 J Easiest EXPLANATION: We know that, Energy, E = 0.5 LI^2 Or, E = 0.5 X 5 X 1^2 = 2.5 J.

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