Say I've inserted a north pole of a bar magnet into a toroidal coil. When the bar is moving there will be an induced EMF in the coil which will lead to a magnetic field that opposes the initial magnetic field. From what I understand the B field in the toroidal coil is circular inside the coil. I don't see how to pick the B field in this coil so that it opposes the initial field due to the bar magnetic. Aren't they orthogonal to each other?