# Q & A: low self-inductance

Q:
Hi, inductance is the property of a conductor by which a change in current in the conductor "induces" (creates) a voltage (electromotive force) in both the conductor itself (self-inductance). --wikipedia From what I understand, the inducing happens due to the resulting change in magnetic field from the change in current from a change in voltage. Also, from what I understand, the greater the current, the greater the magnetic field. However, the inductance of a coil is not dependent on the current. My reasoning behind that is that for every unit of current in the coil, there is a proportional amount of magnetic field which induces an opposing voltage (and in turn current. So if current increases, a proportional amount of opposing current will be there, therefore it cancels out in the formula just like this guy explains: watch?v=Ab0dJLdmApg My question comes here: If you have a second source of changing magnetism (external source), is it possible that the second magnetic source and the primary magnetic source (coming from the coil itself) have their net flux cancelled out within the same coil? If so, the self inductance of the coil would be zero and the coil would act as a regular wire with no inductance. No net flux, no induction right? This question has been really bugging me since I've learned in school that inductance of a coil cannot change no matter what. Thanks
- kevin (age 19)