What causes self inductance?
In the case of self-inductance, the magnetic field created by a changing current in the circuit itself induces a voltage in the same circuit. Therefore, the voltage is self-induced. This causes a voltage to be induced in the coil when the current is changing.
Does self inductance depend on current?
Self-inductance is proportional to the magnetic flux and inversely proportional to the current. This means that the self-inductance does not depend on the current. If the emf is induced across an element, it does depend on how the current changes with time.
Why are inductors designed to vary with time?
If an inductor is designed so that any one of these factors may be varied at will, its inductance will correspondingly vary. Variable inductors are usually made by providing a way to vary the number of wire turns in use at any given time, or by varying the core material (a sliding core that can be moved in and out of the coil).
How does the number of turns affect inductance?
Number of Wire Wraps, or “Turns” in the Coil. All other factors being equal, a greater number of turns of wire in the coil results in greater inductance; fewer turns of wire in the coil results in less inductance.
How does the core affect the inductance of a coil?
If the hysteresis of the core material is significant, this will also have strange effects on the inductance of the coil. Inductor designers try to minimize these effects by designing the core in such a way that its flux density never approaches saturation levels, and so the inductor operates in a more linear portion of the B/H curve.
How can mutual inductance be increased in a loop?
Mutual inductance can be increased by decreasing the distance between the traces (reducing the loop area) and by increasing the width. I believe this has to do with how the magnetic field is distributed around the trace, but this comes down to a physics question.