Magnets and magnetic fields

Magnets can pull or push on certain objects without touching them, and the strength of that pull or push depends on how close the magnets are and how they're facing each other. This happens because every magnet creates an invisible magnetic field in the space around it, and effects like a compass needle turning or iron filings lining up nearby are evidence that field is really there. Engineers use magnets to solve real problems, like designing a latch that holds a door shut.

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