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प्रश्न
What is declination ? Draw a diagram to show the angle between the declination and true direction of geographic north.
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उत्तर
Magnetic declination is the angle of the horizontal plane between the magnetic North and the geographic North (or true North). This angle is shown in figure by symbol θ.
The angle of declination is different at different places on the earth surface and it also changes at a place with time. The declination is taken positive if the magnetic North is towards the east of the true North as in figure and is negative if the magnetic north if towards the west of the true North.
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संबंधित प्रश्न
How will you test whether a given rod is made of iron or not?
What is a magnetic compass ? State its use.
How will you do this?
Find the north pole of a magnet.
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 |
Draw lines of force surrounding a bar magnet when it is placed in the magnetic meridian with its north pole pointing geographic, north.
The figure shows a freely suspended magnet in the rest position. Copy the diagram and on its show:
- Angle of declination
- Angle in dip
Draw a clearly labelled diagram, to show how a steel bar is magnetised by a divided touch method. A written description is not required.
The south pole of a bar magnet and the north pole of a U-shaped magnet will _______.
Define natural magnet.
Define artificial magnet.
