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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.
1 Magnetic fields arise from current flows. 2  Their strength is measured in amperes per meter (A/m). 3  Magnetic fields exist as soon as a device is switched on and current flows. 4  Field strength decreases with distance from the source. 5  Magnetic fields are not attenuated by most materials.