Imagine an electromagnet. If you have a high current and low voltage vs a low current and high voltage which will create a stronger magnetic field? I understand the low current high voltage has to have a higher resistance but imagine it has a way of changing without changing the number of windings or anything else.
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Maxwell’s equations fundamentally define the properties of electromagnetic fields, and voltage isn’t a factor here. Current (specifically current density) is the main input into this equation. (Note: Ignoring polarization current for this discussion, which muddies the waters a little bit)
The premise of your question is what is misguiding the discussion a little bit. All other things held equal, a conductor with high current and low voltage applied across it will produce the strongest magnetic field.
You alluded to it a little bit, but increasing the number of turns in a current loop will produce a stronger magnetic field. This is one of the reasons why it is most useful for Maxwell’s equations to express current as current density (coulombs per second per square meter) rather than just current (coulombs per second). Even if we hold the current equal, increasing the number of turns in a winding increases the current density.
Source: Electrical Engineer / Electromagnetic transient simulation
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