why are electromagnets better to use than regular magnets for picking up wrecked cars in a junkyard?

Question by : why are electromagnets better to use than regular magnets for picking up wrecked cars in a junkyard?

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because they are only magnetic when electrical current is applied to them, So they can apply the power to turn them on to lift scrap metal, then turn it off to release the objects after they have moved it to where they want to drop it.
They are stronger, also, when activated, than a regular magnet, so they can lift more.

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