Question

Which of the following inductor will have the least eddy current losses?A. Air coreB. Laminated iron coreC. Iron coreD. Powdered iron core

Answer 1

Answer:

Air cores inductor will have the least eddy current losses.

A is correct!

Answer 2

(a). Air core inductor the least eddy current losses.

Explanation:

• Eddy current loss is conductive $I2R$ loss produced by circulating currents induced in response to AC flux linkage, flowing against the internal resistance of the core.
• An air core inductor is a wire coil with no solid core inside the coil. Air has a low electrical conductivity, and so produces the weakest of all magnetic fields in opposition to current flow.
• With ferromagnetic cores such as iron, the core can become magnetically saturated when the magnetic field is too strong.
• The air core inductor is used in filter circuits. It is used to ensure a lower peak inductance, but also reduces the energy losses associated with ferrite inductors.
• It is used in high-frequency applications including TV and radio receivers.