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as you know according to ampere's law ∫B.dl=μ_{0}I

but why μ_{0}that appears in Maxwell's equations is exactly 4π *10^{-7}?

for example in electric field ε_{0}is 8.85 *10^{-12}

and μ_{0}like ε_{0}is a constant that is related to material properties and why this constant is a special number as π that B is special ?

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# Magnetic field and π

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