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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.
Use a multimeter to do this. The stronger the current, the stronger the magnetic field generated. Ampere-turn per meter is another metric unit for measuring magnetic field strength. This represents how if the current, the number of coils, or both are increased, the magnetic field strength increases.