Question

How does the Reactance of an inductor increase when an iron core is inserted into the coil? (AC chapter, CBSE Class 12)

Answer 1

Explanation:

Iron has high permeability compared to air. So, an iron core will help in linking the flux within it better than air. As inductance depends on permeability (which is constant for a material), the self as well as the mutual inductance increases. But you don't necessarily need to depend upon core material for inductance as you can increase or decrease inductance by tuning the number of turns hence mmf.

Self inductance is directly proportional to squared the number of turns. So, you can reduce or increase inductance with comparatively minimum effect on the mmf which is directly related to number of turns only.

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