B-Field Phase: AC Voltage vs. AC Current

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    B-field Phase
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The discussion centers on the relationship between AC voltage, AC current, and the magnetic field (B-field) generated by Helmholtz coils. It concludes that the AC component of the B-field will be in phase with the AC current rather than the AC voltage. This is based on the principle that currents induce magnetic fields, not voltages. The initial confusion is acknowledged, leading to a clarification about the phase relationship. Overall, the key takeaway is the direct correlation between AC current and the induced B-field phase.
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Imagine I take a pair of helmholtz coils and apply a DC current, modulated by a much smaller AC current so that the B-field between the coils varies sinusoidally about some fixed value. Will the AC component of B be in phase with the AC voltage, or the AC current?
 
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Waitaminute, it's obviously in phase with I. Currents induce magnetic fields, not voltages. Sorry guys, think it's past my bedtime...
 

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