Illustration of a solenoid with a circular shape of cross section. If the difference between the inner d and outer D diameters is very small then the magnetic field strength distribution H(x) as a function of position x along the axis of the coil can be calculated according to the equation of “thin solenoid”. If the difference between d and D is significant then the “thick solenoid” approach is more suitable.
solenoid_thin_thick_magnetica.png
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