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Permanent magnets can be made using hard magnetic materials.
Which of the following is not the correct method to make permanent magnets?
Using a bar magnet to stroke a steel bar
Using two bar magnets to stroke a steel bar
Placing a steel bar in a solenoid that connects to a DC supply
Placing a steel bar in a solenoid that connects to an AC supply, then slowly withdrawing the steel bar away from the solenoid in West-East direction
The AC supply will mix up the direction of the magnetic domains. In fact, this is one of the methods to demagnetise magnets.
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