Adding a ferrite core to a coil will cause its inductance to increase or decrease?

Adding a ferrite core to a coil increases its inductance. This occurs because a ferrite core has a high magnetic permeability compared to air or other non-magnetic materials. When the coil is wound around this core, the magnetic field generated by the coil interacts more effectively with the core material.

The increased permeability allows the magnetic field to be concentrated within the core, which enhances the coil's ability to store magnetic energy. The inductance (measured in henries) of a coil is directly related to the properties of the core material used as well as the geometry of the coil. By inserting a ferrite core, the coil can store more magnetic flux per ampere of current, leading to a significant increase in inductance. Therefore, it is accurate to say that the inductance will increase when a ferrite core is added.