What will be the result of tapping or shaking a magnetized nail if there is no external magnetic field?

Tapping a magnetized nail will cause demagnetization from the waves that travel through the nail. Plus, you can keep in mind the fact that the Steel of the nail is quite soft and has a weak magnetic permeability, therefore it loses its magnetic properties from impacts. An even more effective demagnetization can be from ultrasound.



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