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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
What is the magnetic induction? Explain with the help of a diagram.
State if the following statement is true or false. Correct the statement if it is false.
As we move away from a magnet, its attraction power weakens.
Answer the following in detail.
How is the single-touch method of magnetism different from the double-touch method?
Answer the following in detail.
How can a magnet be demagnetized?
When magnetic material is taken close to a magnet, the material acquires ______.
Distinguish between the two methods of making artificial magnets.
Give scientific reason:
Two steel needles hanging from the lower end of a vertical bar magnet do not hang vertically.
What is a neutral point?
Which is not attracted by a magnet?
