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प्रश्न
Answer the following in detail.
How can a magnet be demagnetized?
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उत्तर
A magnet can be demagnetized in the following ways :
- rough handling
- hammering the magnet several times.
- passing an alternating current around the magnet.
- dropping the magnet on the floor several times.
- heating the magnet to a very high temperature.
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संबंधित प्रश्न
Fill in the blank
To light a table lamp and to run a refrigerator, we use ______ as the source of electricity.
Match the following
| Column A | Column B |
| (a). Human body | (1). electric bell |
| (b). Silk thread | (2). current |
| (c). Charge in motion | (3). conductor |
| (d). soft iron | (4). electromagnet |
| (e) . Electromagnet | (5). insulator |
“Poles exist in pair”. Comment on this statement ?
Tick the most appropriate answer.
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Give scientific reason:
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Maximum iron filings stick in the middle of a bar magnet when it is brought near them.
The south pole of a bar magnet and the north pole of a U-shaped magnet will _______.
The magnetic poles always exist in pairs.
Define artificial magnet.
