Can you put a magnet in the microwave?

Microwave ovens are not designed to operate with metal in them. If your magnet is metal it causes the microwave energy to be reflected back into the emitter (voltage standing waves) and can quickly overheat and kill it.

Source: https://www.quora.com/Using-a-magnetic-lid-in-the-microwave-can-the-magnets-harm-the-microwave#:~:text=Microwave%20ovens%20are%20not%20designed,quickly%20overheat%20and%20kill%20it.

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