Question

Calculate the magnetic energy when the magnetic intensity in air is given as 14.2 units(in 10^-4 order) (a) 1.26 (b) 2.61 (c) 6.12 (d) 1.62 I got this question by my college professor while I was bunking the class. Asked question is from Magnostatic Energy in chapter Magnetostics of Electromagnetic Theory Select the correct answer from above options Electromagnetic Theory questions and answers, Electromagnetic Theory questions pdf, Electromagnetic Theory question bank, Electromagnetic Theory questions and answers pdf, mcq on Electromagnetic Theory pdf,electromagnetic theory book pdf,electromagnetic theory pdf notes,electromagnetic theory lecture notes,electromagnetic theory of light,maxwell electromagnetic theory,electromagnetic theory proposed by,electromagnetic theory engineering physics,electromagnetic theory nptel

Answer 1

The correct option is (a) 1.26 Easiest explanation: The magnetic energy is given by E = 0.5 μ H^2. Put H = 14.2 and in air μ = 4π x 10^-7, we get E = 0.5 x 4π x 10^-7 x 14.2^2 = 1.26 x 10^-4 units.