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प्रश्न
Answer the following in detail.
Write a short note on the theory of magnetism.
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उत्तर
All substances are made of minute particles. In a magnetic substance whether magnetized or non-magnetized), each individual particle behaves like an independent magnet. In the unmagnetized state, these particles within the substance are present in a random fashion such that they cancel out the magnetic effects of each other.
In a magnetized state, these particles align in a particle direction and the substance behaves like a magnet.
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संबंधित प्रश्न
Fill in the blank
Like poles ______ each other and unlike poles _____
What is a magnetic compass ? State its use.
Fill in the blank.
Magnetic poles always exist in ...............
Define the following term regarding a bar magnet:
Magnetic field
If a magnet is carefully broken into two pieces as shown in figure (i), how does the magnetic strength of each piece compare with that of the original magnet? If another magnet is carefully broken in half along its long axis shown in figure (ii), how would the strength of each piece compare with that of the original magnet?
Draw a clearly labelled diagram, to show how a steel bar is magnetised by a divided touch method. A written description is not required.
What do you understand by the term magnetic declination?
State three important properties of a magnet.
Thamizh Dharaga and Sangamithirai were playing with a bar magnet. They put the magnet down and it broke into four pieces. How many poles will be there?
Give the uses of magnets in everyday life.
