Magnetic susceptibility and relative permeability

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.

http://ift.tt/1jmc2g1

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