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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.
The field strength is the negative first derivative of the potential. For example, in Cartesian coordinates, with electric potential V=V(x,y,z), the electric field is: E=ââV=ââVâxiââVâyjââVâzk. Note that you can add or subtract an arbitrary constant potential to V and it will not affect the field strength, since its derivative will be 0.