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What happens to the effective inductance when a ferromagnetic core is introduced?

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What happens to the effective inductance when a ferromagnetic core is introduced?

(a) Increases

(b) Decreases

(c) Remains the same

(d) Becomes zero

The question was posed to me during a job interview.

This intriguing question comes from Ferromagnetic Cored Inductor in a DC Circuit in portion Inductance in a DC Circuit of Basic Electrical Engineering

1 Answer

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Best answer
Right option is (a) Increases

Easiest explanation: The effective inductance increases when a ferromagnetic core is introduced within an inductor because of the flux increases. Inductance varies directly with the flux hence it increases.

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