15. Inductor Basics

Question.2

Shantanu is designing an input EMI filter for a device powered by 12 V DC.

He chooses a standard wire-wound inductor (10 µH, 3 A) and places it in series with the input supply line to reduce noise.

However, he notices that common-mode noise is still high, and EMI test fails.
What is the most likely reason?

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