Giant magnetic field Traditional Cache

I hope your GPS device works here at this giant magnetic field.

I found this explaining this particular device and how it generates a magnetic field. Maybe you can find something else stuck here.

The magnetic component of an EM field is how power can be moved from one circuit bound to the power source to another circuit bound to a power sink (aka, the load) so that useful work can be done.

Electricity travels as an electromagnetic wave rather than in a manner like a pile of electrons in a hose. The electrons don’t move very fast, but they carry the electric charge of the EM wave. The magnetic field is part of the EM wave we call electricity and together with the charge make up the EM wave. DC, by the way, is also an EM wave with a frequency of zero.

In the wire, the magnetic component of the EM wave is what excites the charge carriers, the electrons, to move and in moving, causes those electrons to also emit a magnetic field. The speed of the electrons and the EM wave are what are very slow and the speed of light in a medium, respectively.

The coils of a stator/rotor of a generator or primary/secondary of a transformer, stack up the magnetic force until it is large enough to handle the rated power for that device. The ratios of the coils windings are what allow the device to trade current for voltage, but always at a slight loss of power, so we can change the speed, voltage, current or any other aspect of the electricity at will.