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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.
As will be explained in the next episode, the unit for electric field strength can also be expressed as volts per metre, V m-1. Now, for the non-uniform field due to a point (or spherical) charge, we can use Coulombâs law to find an expression for the field strength. Consider the force felt by a charge q in the field of another charge Q, where the charges are separated by a distance r: by Coulombâs Law.