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Add note to model.md about wire length and resistance - see #70
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@matthew-blackman
matthew-blackman committed Apr 3, 2024
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Expand Up @@ -50,8 +50,11 @@ points in these grids, scaled to match the strength of the bar magnet.
### Electromagnet
The electromagnet (see `Electromagnet`) is based on a coil magnet model. Its voltage source can be either a DC or AC power supply.
The strength of the B-field produced by the electromagnet is proportional to the voltage in the
power supply and the number of loops in the coil. (The diameter of the loops is fixed.) The normalized current in the coil
is proportional to the voltage of the power supply. **Note that there is no model of resistance for the coil or voltage source.**
power supply and the number of loops in the coil. (The diameter of the loops is fixed.)

The normalized current of the electromagnet is proportional to the voltage of the power supply, and is not affected by the
length of the wire in the coil. This current is unaffected by the number of loops or the loop area, behaving as if
the wires in the electromagnet coil have zero resistance.

The DC power supply (aka battery) has a maximum voltage, and its voltage
and polarity is varied by the user via a slider control. See `DCPowerSuply`.
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