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In honor of tariq.ahmad 's emphasis on magnetism this month, I thought I would do a little experiment involving the Magnetostrictive Phenomenon. Magnetostriction is a property of a ferromagnetic material whereby it changes shape when it is subjected to a magnetic field. Anyone who has worked with transformers is familiar with the low frequency 50 or 60 Hz hum that can usually be heard coming from the transformer. This is an undesirable magnetostrictive effect that is causing the hum and a subse ...