Limits of applicability of the formula for tan(δ) from ηB

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Δ(tan(δ)) = ηB•ΔB•µe gives increase of tan(δ). But what are limits of applicability in terms of B and in terms of H ?
In partcular I want to use ferrite with µi = 2100 (CF139 ferrite or similar).
 

It should be: Limits of applicability of the formula for tan(δ) from hB

Δ(tan(δ)) = hB•ΔB•µe gives increase of tan(δ). But what are limits of applicability in terms of B and in terms of H ?
In particular I want to use ferrite with µi = 2100 (CF139 ferrite or similar).
 

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