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A comment on A noise two percent of people can hear. Parent comment

Re:A noise two percent of people can hear by opwieurposiu on Friday July 19, 2019 @11:11AM (#20479264)
Magnetostriction is what makes transformers hum. The magnetic field changes the shape of the material turning it into a sort of loudspeaker.

https://eng.libretexts.org/Bookshelves/Materials_Science/Sup...

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