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Find the energy of a coil of inductance 18mH and current passing through it 1.25A.(in 10^-3 order)(a) 14.06(b) 61(c) 46.1(d) 28.12The question was posed to me in an international level competition.Question is from Magnetostatic Properties in portion Magnetostics of Electromagnetic Theory

Answer»

Correct answer is (a) 14.06

Easiest EXPLANATION: The magnetic energy possessed by a COIL is given by E = 0.5 x LI^2. PUT L = 18 x 10^-3 and I = 1.25, thus we get E = 0.5 x 18 x 10^-3 x 1.25^2 = 14.06 x 10^-3 UNITS.



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