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प्रश्न
How do you account for the following fact?
Soft iron keepers help to prevent the magnets from losing their magnetic properties.
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उत्तर
In magnets, external fields like earth’s magnetic field can randomize the domains. Perhaps stray fields caused by flowing currents in nearby electric circuits can also disturb i the alignment of domains lying inside a magnet. Given enough time, such magnets may find their domains randomly oriented and hence their net magnetisation may get lost. A keeper for magnets is just a strong permanent magnet that keeps all the domains pointing the same way and realign those that may have gone astray and hence magnet, can retain its magnetism for a long time.
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संबंधित प्रश्न
The magnetic field lines produced by a bar magnet:
(a) originate from the south pole and end at its north pole
(b) originate from the north pole and end at its east pole
(c) originate from the north pole and end at its south pole
(d) originate from the south pole and end at its west pole
If you hold a coil of wire next to a magnet, no current will flow in the coil. What else is needed to induce a current?
What is a lodestone?
Explain the method of plotting the magnetic field lines by using a small compass needle.
Which substances are used for making electromagnets?
Complete the following diagram of magnets to show the lines of force.
What are the properties of a magnet?
Inside the magnet, the field lines moves ____________.
______ is the number of magnetic field lines passing through a given area.
Assertion (A): Magnetic field lines never intersect each other.
Reason (R): If they intersect, then at the point of intersection, the compass needle would point towards two directions, which is not possible.
