A soft iron piece in an electromagnet, on which an insulated copper wire is wound, is called,

Insulator

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Stem

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Core

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Solution

The correct option is C
Core

An electromagnet is made up of a soft iron core insulated by copper wire.
It behaves like a magnet when current is passed through it and loses its magnetism when current is stopped.
Insulator is a material whose resistivity is so high that it doesn't conduct electricity.
Hence, option (C) is the correct option.

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