The inductance of a coil depends on.

Number of turns

Resistance of the wire used

Type of insulation used on the wire

Voltage applied to the coil

Number of Turns: The inductance increases with an increase in the number of turns in the coil. More turns create a stronger magnetic field, which enhances inductance.

Explanation

Inductance ( $L$ ) is primarily influenced by the following factors:

Number of Turns:
The inductance increases with an increase in the number of turns in the coil. More turns create a stronger magnetic field, which enhances inductance.
Area of the Coil:
The larger the cross-sectional area of the coil, the greater the inductance, as it can enclose more magnetic flux.
Length of the Coil:
The inductance decreases with an increase in the length of the coil. A longer coil has a weaker magnetic field for a given current.
Core Material:
The material around which the coil is wound (the core) affects inductance. Ferromagnetic materials increase inductance due to their higher permeability compared to air or non-magnetic materials.