Magnetic Proximity
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Magnetic Proximity The pulling force a magnet exerts follows an inverse-cube law: doubling the distance to a magnet reduces its force to one-eighth the previous amount. This means a magnetic switch is sensitive to the movement of a nearby magnet. A burglar alarm, for example, has a small permanent magnet mounted to a door and the magnetic switch mounted next to it on the door frame; opening the door actuates the switch immediately. |
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