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प्रश्न
What are magnetic keepers? What are they used for?
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उत्तर
Magnetic keeper: A magnetic keeper is a ferromagnetic bar made from soft iron or steel, which is placed across the poles of a permanent magnet. Magnetic keepers are used to preserving the strength of the magnet by completing the magnetic circuit.
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संबंधित प्रश्न
Define the following term regarding a bar magnet:
Magnetic field
Distinguish between the two methods of making artificial magnets.
Describe, how you will proceed to determine the position of the pole of a bar magnet.
State three important properties of a magnet.
Why it is not advisable to slide a magnet on an iron bar back and forth during magnetising it?
What will happen when we place magnets near cell phones, computers, and DVDs?
Observe the pictures A and B given in figure carefully.
Which of the following statement is correct for the above given pictures?
Match the following:
| 1. | Electricity and magnetism | a. | Step-down transformer |
| 2. | Force on the conductor | b. | Hans Christian Oersted |
| 3. | Electric bell | c. | I LB |
| 4. | Ns <Np | d. | Electromagnet |
Define artificial magnet.
