Question

The mass of a specimen of a ferromagnetic material is $0.6kg$ and its density is $7.8\times {10}^{3}kg/m^3.$ If the area of hysteresis loop of alternating magnetising field of frequency $50Hz$ is $0.722MKS$ units then the hysteresis loss per second will be :-

• A. $277.7\times {10}^{-5}J/sec$
• B. $277.7\times {10}^{-6}J/sec$
• C. $277.7\times {10}^{-4}J/sec$
• D. $277.7\times {10}^{-3}J/sec$

Answer 1

The correct option is A $277.7\times {10}^{-5}J/sec$

$\begin{array}{c}Accorrdingtoquestion.......................\\ Here,\\ Hysteresisenergylostpersecondis:\\ E=nA\frac{m}{p}=\frac{50\times 0.722\times 0.6}{7.8\times {10}^3}\\ \therefore 277.7\times {10}^{-5}J/S\\ SothecorrectoptionisA.\end{array}$