According to Wikipedia we now have $$ \mu_0= 4\pi × 1.00000000082(20)×10^{-7} {\rm H⋅m^1} $$
mike stone
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According to Wikipedia we now have $$ \mu_0= 4\pi × 1.00000000082(20)×10^{-7} {\rm H⋅m^1} $$