B=μ0μmNlI,B=\mu_0\mu_m\frac NlI,B=μ0μmlNI,
μm=1+χm,\mu_m=1+\chi_m,μm=1+χm,
Nl=n,\frac Nl=n,lN=n,
B=μ0(1+χm)nI.B=\mu_0(1+\chi_m)nI.B=μ0(1+χm)nI.
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