Question

Choose the incorrect statement among the following.

• A. A bar magnet loses its magnetic property when dropped from a certain height.
• B. A bar magnet that has been demagnetised can't be converted to a magnet again.
• C. A bar magnet which is heated beyond a certain temperature loses its magnetic property.
• D. A bar magnet loses its magnetic property when hammered repeatedly.

Answer 1

The correct option is B A bar magnet that has been demagnetised can't be converted to a magnet again.

It is possible to magnetise a demagnetised magnet again by various methods like rubbing with another magnet , using two magnets for stroking ,etc.
A bar magnet loses its magnetism when:
1. Its hammered repeatedly
2. Dropped from a certain height
3. Heated at and beyond its curie temperature.