Like in a dc dynamo where permanent magnets are used, do they eventually get demagnetized?
Or is magnetism like gravity, and never gets drained?
In: Physics
As long as they don’t get too hot or hit with too much impact or magnetism, magnets never lose their power. It is a property, like mass, but unlike mass (which can only be destroyed in nuclear reactions) magnetism can destroyed by high heat and a few other types of abuse. This also allows you to “add magnetism” to some metals to make them magnetic thereafter.
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