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Wrapping a number of coils of insulated wire around an iron nail, and a passing a current from a battery through it, turns the iron nail in to an electro-magnet. While the current flows, the nail will attract metal objects. It is a standard demonstaration in science classes in schools. The more turns the stronger the attraction.

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Q: Why do the iron nail attracts more number of pin when wrapped with a cool of more number turns?
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