Electrical Circuit Theory and Technology 6th Edition by John Bird

Exercise 6

The core of an inductor has a hysteresis loss of 25 W and an eddy current loss of 15 W when operating at 50 Hz frequency. Determine (a) the values of the losses if the frequency is increased to 70 Hz, and (b) the total core loss if the frequency is 50 Hz and the laminations are made three quarters of their original thickness. Assume that the flux density remains unchanged in each case.