Explain  the  difference  between  a Ferromagnet  and a  paramagnet on the  basis  of macroscopic  measurements.  What is the  saturation  magnetization  and  how  does  it  differ  as  a  material  is  heated  through its  Curie  point? What  criteria  are  used  to  distinguish  between  hard  and  soft  magnetic  materials? In  deciding  on  a  material  for  use  in  (a)  an  electromagnet  (b)  a  transformer  what magnetic  properties  would  you  take  into  consideration?