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Click symbol for equation magnetic constant  Value  4pi x 10-7 = 12.566 370 614... x 10-7 N A-2  Standard uncertainty  (exact)   Relative standard uncertainty  (exact)  Concise form  4pi x 10-7 = 12.566 370 614... x 10-7 N A-2       Click here for correlation coefficient of this constant with other constants Source: 2006 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant     or