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प्रश्न
Give scientific reason:
Soft iron is used to make electromagnets.
उत्तर
Soft iron is used to make electromagnets because it has high susceptibility and low retentivity, it gets magnetized very faster and loses magnetism as soon as the inducing magnet is removed.
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संबंधित प्रश्न
Define the following term regarding a bar magnet:
Magnetic equator
If a bar magnet is hung by a thread tied at its center, its north pole becomes steady in the direction of the ______ Pole of the earth.
There is repulsion between the _____ poles of a magnet and attraction between its _____ poles.
If a magnet attracts a piece of metal, that piece must be made of ______.
Fill the blank spaces in the table given below:
| Nature of bar | Action of compass needle | |
| North Pole | South Pole | |
| Non-magnetic | No action | ________ |
| ________ | attracted | attracted |
| North pole of a bar magnet | ________ | _________ |
| ________ | attracted | repelled |
The figure shows a freely suspended magnet in the rest position. Copy the diagram and on its show:
- Angle of declination
- Angle in dip
Define the term Magnetic axis
Define the term Effective length of a magnet
Give scientific reason:
Two steel needles hanging from the lower end of a vertical bar magnet do not hang vertically.
