Present participle of demagnetise; the process of removing magnetic properties.
From 'demagnetise' (verb) + '-ing' (present participle/gerund suffix). British English spelling; American English uses 'demagnetizing.'
The ongoing '-ing' form in 'demagnetising' suggests an active process—which is accurate. Demagnetization happens over time through heat, vibration, or electrical pulses, not all at once.
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