Air core and ferrite core inductors are used in

Air Core Inductors: The core material is air, so it has low permeability and hence lower inductance. ∴ It can be used for high-frequency applications.

Applications:

• It is used for constructing RF tuning coils.
• The air core inductor is used in filter circuits and Snubber Circuits.
• It is used to ensure a lower peak inductance.
• It is used in high-frequency applications including TV and radio receivers.

Ferrite Core Inductors:

• By winding a length of wire around a ferrite core will result in a ferrite core inductor.
• Ferrite core inductors have high permeability, high electrical resistivity, and low eddy current losses these characteristics make them suitable for many high-frequency applications.

Applications:

• It can be used at high and medium frequencies.
• It is used in switching circuits.
• Pi Filters.