Abstract
It is impracticable to measure directly the magnetic field due to an electric current in a single long straight conductor, since a complete circuit is necessary. By using a narrow rectangular coil the field is, within reasonable limits of accuracy, the same as that due to the two long sides regarded as infinite in length. The formulae for the field are simple for points along two axes relative to the coil, provided the points are not too far removed from its centre. The linearity of suitable graphs of a series of observations constitutes a verification of the law derived for a single straight conductor, and from the graphs values of the horizontal component of the earth's magnetic field can be determined. Two experimental methods, involving the location of neutral points, are described.
Published Version
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