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प्रश्न
How can you demagnetise a bar magnet by employing alternating current?
दीर्घउत्तर
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उत्तर
- Step 1: Place the bar magnet inside a solenoid through which a high alternating current (A.C.) is flowing.
- Step 2: The rapidly reversing magnetic field of the A.C. disturbs and randomizes the alignment of the internal magnetic domains of the magnet.
- Step 3: While the current is still switched on, slowly withdraw the bar magnet far away from the solenoid along its axis.
As a result, the magnet gets completely demagnetized.
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