Question

When a ferromagnetic substance goes through hysteresis loop,magnetic susceptibility___________
a)remains constant
b)may be zero
c)may be infinite
d)may be negative

Answer 1

It's positive and so as per me "C" should be the answer. Just read on wikipedia. And also if it's pure feromagnetic then it has to have infinite suscepitance.

http://en.wikipedia.org/wiki/Magnetic_susceptibility

Answer 2

But the answer given is b,c,d

Answer 3

i did not know it was multiple choice. I took it to be, one right answer. and I assumed an Ideal feromagnet. you know the hysteresis loops curve?

Answer 4

yup