For a solenoid of length L = m with N = turns,
the turn density is n = N/L = turns/m.
If the current in the solenoid is I = amperes and
the relative permeability of the core is k = ,
then the magnetic field at the center of the solenoid is B = Tesla = gauss.
The Earth's magnetic field is about half a gauss.
The relative permeability of magnetic iron is around 200.
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