Question

What is value of B called, when H = 0 is in the hysteresis loop?

Hint:

{Retentivity} = {Retained} magnetism. It's the memory of the magnetic field that was applied.

Answer 1

In a hysteresis loop, when the external magnetizing field (H) is reduced to zero, the remaining magnetic flux density (B) in the material is called Retentivity or Remanence. It represents the ability of a magnetic material to retain its magnetism after the external magnetizing field is removed.