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A Helmholtz coil consists of two round loops with \(N\) windings and with radius \(R\), which are placed at a distance \(d\) from each other. If an electric current \(I\) is now sent through these coils, a magnetic field is created around the loops.
If the current in both coils has the same orientation and the radius is the same as the distance between the coils, then the magnetic field between the coils is homogeneous.