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Question:

How long does the magnetism in a magnet last?

How long does the magnetism in a magnet last?

Answer:

It will last till the end of time but the intensity of its magnetism will decrease continually in a specific proportion with respect to time. I am talking about Permanent Magnet. In an electro magnet the story is different. Its magnetic property lasts till current flows through its conductor coils.
In a permanent magnet permanent is the key word unless the magnet is violently jolted or moved through a strung magnetic field in the wrong way.

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