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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
What is a magnet?
Fill in the blank.
Magnetic poles always exist in ...............
How will you do this?
Determine whether a material is magnetic or non-magnetic.
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 |
State three important properties of a magnet.
Give scientific reason:
Not attraction but repulsion is a sure test of magnetism.
With the help of a diagram explain the following:
Magnetisation of steel needle using electric current such that the pointed end should have north polarity.
The south pole of a bar magnet and the north pole of a U-shaped magnet will _______.
