I understand why slowing the current, causing a decrease in the flux, momentarily increases the current (stabilizing). I can use the right hand rule and Lenz's law to picture what is happening in that case. But why does increasing the current add resistance? The induced magnetic field is dependent on the current, so adding current should just add flux in the existing direction, shouldn't it? Or is it that an inductor requires a ferromagnetic core, and this develops its own magnetic field, separate from the magnetic field produced by the current, and it is the core's field that wants to remain stable? Will a solenoid without a ferromagnetic core behave like an inductor? Even marginally?