IRON UNDER PERIODIC MAGNETIZING FORCES. 



103 



t)emg dissipated as heat. To effect this &, the amplitude of the 

 magnetic oscillatioii is made greater than its value due to B^ alone — 

 that is, than its value if H were of pure sine form=H, sin o)t without 

 upper harmonics. 



In the case of L some of the energy received from B, is sent out, 

 and so less magnetic energy is dissipated in the iron, and this is 

 effected by the amplitude of A, being reduced. 



