Lets say you have an uniform prism magnet of Iron for example. How would you calculate the demagnetization field H which the bar magnet produces? As I understand, first you need the magnetization M which is the magnetic moments per volumen. But then what ? Or would you apply and external field to the bar magnet and see how it reacts, if this is the case, how does this work ?

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Cristal Obrien · Accepted Answer

If you know M then H is just       M          χ      m       where       χ    m   is the magnetic susceptibility. This only holds for paramagnets and diamagnets, however. In the case of a ferromagnetic material like iron, you would have to refer to the hysteresis curve. If you know the net (= applied+induced) magnetic field B in the material, then you can use any of these relations                    H        =                                          B                          n              e              t                                μ                                    H        =                                          B                          a              p              p              l              i              e              d                                            μ            0                                              H        =                                          B                          n              e              t                                            μ            0                          −        M                            H        =                                                        B                              a                p                p                l                i                e                d                                      +                          μ              0                        M                    μ                                  (          ∵                      B                          i              n              d              u              c              e              d                                =                      μ            0                    M          )                    where   μ  =permeability.

Lets say you have an uniform prism magnet of Iron for example. How would you calculate the demagneti

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