When you will get maximum inductance in the copper wire?

Answer 1

The inductance of a wire or coil is upon the length of wire and the permeability of the core material, if not air.

1. To maximise inductance, use more wire (and wind into a solenoid shape).
2. To maximise the inductance for a given volume, ensure that the winding cross-section is approximately square (i.e winding thickness = winding height).
3. Lastly, to maximise the inductance of a square assembly, use a core with higher permeability, such as iron for power frequencies, or powdered iron or ferrite for higher frequencies.

Answer 2

Maximum inductance in a copper wire occurs when the wire is wound into a tight coil or solenoid with many turns closely packed together. Additionally, using a ferromagnetic core within the coil can also increase the inductance.