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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.
Magnetic fields. 1  Electric fields arise from voltage. 2  Their strength is measured in Volts per metre (V/m) 3  An electric field can be present even when a device is switched off.  Field strength decreases with distance from the 1  source. Most building materials shield electric fields to some extent.  Magnetic fields arise from current flows.