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Question

What happens to inductive reactance, when frequency increases?

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

It increases.

Inductive reactance \(X_L\), is the opposition to the flow of current offered by an inductor. It's directly proportional to the frequency (f) of the applied voltage and the inductance (L) of the inductor. The relationship is expressed by the formula:

\(X_L = 2\pi fL\)

From this formula, it's evident that if the frequency (f) increases while the inductance (L) remains constant, the inductive reactance (\(X_L\)) will also increase proportionally. Therefore, when the frequency increases, the inductive reactance increases.

In summary: An increase in frequency leads to a greater opposition to current flow in an inductor.

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