1. The problem statement, all variables and given/known data find the derivation of χm=μr-1 where Xm is the magnetic susceptibility and μ is the relative permeability. 2. Relevant equations M=Xm.H M is the magnetization,H is the magnetic field μr=μ/μo where μo is the permeability of a vacuum, 3. The attempt at a solution I don't know how to start ,I know some equations related to magnetic properties but i cannot connect them to each other to find the derivation.