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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.
For example, the unit volts per meter (V/m) is used to measure the strength of the electric field and the unit amperes per meter (A/m) is used to express the strength of the magnetic field. RF waves can be characterized by a wavelength and a frequency.