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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.
An electromagnetic field is the combination of two fields, an electric field and a magnetic field. They are oscillating, and are coupled together-an oscillating electric field causes an oscillating magnetic field, and vice versa. Electromagnetic radiation is the consequence of this-the fields move with the speed of light and 'radiate' from a source.