Hello, I was thinking about induced currents in a wire(coil). For example when a current from an external source passes through a wire - the changing magnetic field induces a current opposing the current applied (back emf) like a Newton's 3 law and nothing would ever pass through a wire, but the good part is that the magnetic field produces back emf only when the field is changing, which means that sooner or later there will be no change and no back emf. No back emf - current can flow. Which brings me to the things happening to the wire when the current is stopped: current is stopped, magnetic field collapses and produces current in the opposite direction, but then i think - shouldn't the current produced sort of oppose the collapse of the magnetic field? Or if it can't oppose the collapse of the magnetic field, maybe it can by being created by magnetic field create it's own magnetic field, which would create current, which would oppose the creation of the current creating it and so on, on and on creating back emf, which creates back emf and then a back emf creates again back emf and so on and nothing happens.... The first part has some logic, at least for me, because when a current is applied by external source sooner or later the will be no change in magnetic field- hence no back emf and a flow of current, but in the case of a wire, which has energy induced in it in the form of the magnetic field, shouldn't the magnetic field just fight it self and nothing would happen, because of no external current source- any ideas?