For what purposes is an iron core placed inside an alternating current coil (electromagnet) not made from a solid solid piece of iron

For what purposes is an iron core placed inside an alternating current coil (electromagnet) not made from a solid solid piece of iron, but assembled from thin plates isolated from each other by a layer of varnish?

The core is recruited from thin plates to reduce its heating. In an alternating magnetic field, an iron core composed of thin insulated plates will heat less than a solid core, since its electrical resistance will be greater.

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