Biot-Savart Law
A steady current I flowing in a wire will produce a magnetic field at some point P (referred to as the field point) given by
where m0 = 4p x 10-7 T m /A, and r points from the current element ds to the field point P. In principle, the Biot-Savart law may always be used to solve for B, but it is not always the easiest approach.
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