Question

To demagnetise a given magnet by electrical method, the ends of the insulated copper wire wound round the bar magnet should be connected to a source of

• A. $DC$
• B. $AC$
• C. $DC$ or $AC$
• D. Depends on strength of the bar magnet to be demagnetised

Answer 1

The correct option is B $AC$

By passing an alternating current the magnetic property can be removed because the alternating current produces a reverse magnetising field which opposes the objects magnetism.