Hence if we know the magnetic intensities I and I' due to unit current in each circuit we may obtain M by integrating <s>[mu]<s>1/4[pi] [capital sigma] [mu]II' cos[theta] dV over all space where [theta] is the angle between the directions of I & I'
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J. C. Maxwell’s, ‘Dynamical theory of the electromagnetic field’, 1864. From The Royal Society, PT/72/7
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