A coil has an inductance of 2 H and resistance of 4 Ω . A 10 V is applied across the coil. The energy stored in the magnetic field after the current has built up to its equilibrium value will be _____

Question

A coil has an inductance of 2 H and resistance of 4 Ω . A 10 V is applied across the coil. The energy stored in the magnetic field after the current has built up to its equilibrium value will be _____ × 10 - 2 J

TestHub · Accepted Answer

The data given is L = 2 H R = 4 Ω V = 10 V Using Ohm's law, V = I R , I = 10 V 4 Ω = 5 2 A The energy of an inductor is given by E = 1 2 L I 2 = 1 2 × 2 × 25 4 = 625 × 10 - 2 J

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