Hammering
Heating it
Rough handling it
Solenoid method
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The best method of demagnetizing a steel bar magnet is D. Solenoid method. This method involves passing alternating current through a solenoid (a coil of wire) in which the magnet is placed. The alternating current creates a changing magnetic field which effectively demagnetizes the magnet. Other methods like hammering, heating, or rough handling can also demagnetize a magnet, but they are not as effective and controlled as the solenoid method.
The method of demagnetizing magnet is by 3 method: electrical; mechananical and by heating
all the options are correct but the best answer is by electrical method that is thermally. please my school u poeple should look into this question very well ooo
