Physics
Which is not a method of demagnetising a magnet?
- Heating
- Hammering
- Suspending
- Alternating current
Answer
Suspending
Reason — Demagnetisation of a magnet is achieved by following methods :
- By rough handling
- By dropping the magnet on the floor or on a hard surface a number of times
- By hammering the magnet repeatedly
- By heating the magnet to a very high temperature
- By passing alternating electric current around the magnet
Related Questions
Which of the following is an example of permanent magnets?
- Door of the refrigerator
- Door bell
- Generators
- Electric cranes
Which of the following is made when electricity is passed through it?
- Lodestone
- Natural magnet
- Permanent magnet
- Electromagnet
Which of the following is an example of a magnetic keeper?
- Steel
- Nickel
- Soft iron
- Electromagnet
Match the columns.
Column A Column B 1. Artificial magnets (a) Giant magnet 2. Poles (b) Strong magnets 3. Electromagnet (c) Maximum strength of magnet 4. Self-demagnetisation (d) Temporary magnet 5. Earth (e) Poles left free