Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
The problem is that $ M = \chi_mH $ applies only in diamagnets and paramagnets. But my rod is made of iron, a ferromagnetic material. Do you have any idea of the link between $M$ and the H field with ferromagnetic materials?
