B-field phase question

1. May 12, 2005

locke

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?

2. May 12, 2005

locke

Waitaminute, it's obviously in phase with I. Currents induce magnetic fields, not voltages. Sorry guys, think it's past my bedtime...