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प्रश्न
Answer the following in detail.
List four methods of magnetizing a magnetic substance.
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उत्तर
Methods of magnetizing a magnetic material are :
- Single-touch method – A magnet is rubbed along the magnetic substance from one end to another.
- Double-touch method – Opposite poles of two magnets are placed next to each other at the centre of the magnetic substance and rubbed in opposite direction along it.
- Magnetizing by induction – It is a method to make temporary magnets under the influence of a magnetizing force. The magnetic properties disappear when the influence of the magnetizing force is removed.
(A permanent magnet is brought close to the magnetic substance but not touched.) - Electric current – A magnet made by using electric current is called an electromagnet. It is a temporary magnet and stops behaving like a magnet when the current is stopped. Electromagnets can become permanent magnets if certain materials like steel and special alloys are placed in a coil and a very strong current is passed through the coil.
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संबंधित प्रश्न
Select the correct alternative
A freely suspended magnet rests in
Answer the following in short.
If a bar magnet is placed over iron filings, where will the attraction of the iron fillings be
- maximum?
- minimum?
There is repulsion between the _____ poles of a magnet and attraction between its _____ poles.
Write the answer in your word.
Write the properties of a magnet.
Describe two simple experiments to support the statement that magnetism is a property of the molecules of a magnet.
Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.
Name the metal used for E and F.
Define the following term:
Geographic meridian
Write a short note on lighting conductors.
An object that is attracted by magnet.
Give the uses of magnets in everyday life.
