Question

Find the power of an inductor of 5H and current 4.5A after 2 seconds. (a) 25.31 (b) 50.62 (c) 102.4 (d) 204.8 I had been asked this question during an interview for a job. My doubt is from Magnostatic Energy topic in portion 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) 25.31 Explanation: The energy stored in an inductor is given by E = 0.5 LI^2. Thus, put L = 5 and I = 4.5 and we get E = 0.5 x 5 x 4.5^2 = 50.625 units To get power P = E/t = 50.625/2 = 25.31 units.