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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 a magnetic compass ? State its use.
Match the following
| Column A | Column B |
| A) Steel | 1) to store magnets |
| B) Soft iron | 2) temporary magnet |
| C) Use in electric bell | 3) permanent magnet |
| D) Magnetic keepers | 4) electromagnet |
Draw diagrams of the artificial magnets of four different shapes?
State if the following statement is true or false. Correct the statement if it is false.
Whenever a magnet is not in use, it should be stored along with other magnets.
If a magnet attracts a piece of metal, that piece must be made of ______.
The alloys called ______ and ______ are used for making industrial magnets.
Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.
Why are E and F placed in contact with the poles of the magnets as shown in the diagram?
Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.
Mark on the diagram the poles of the second magnet,
Differentiate between:
Primary and secondary cell.
The strongest natural magnet is ______.
