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The magnetic field strength of an electromagnet is therefore determined by the ampere turns of the coil with the more turns of wire in the coil the greater will be the strength of the magnetic field.
Field Strength at a Point Equidistant from the Two Masses. By symmetry, the field at P must point along the x-axis, so all we have to do is compute the strength of the x-component of the gravitational force from one mass, and double it.