Advertisements
Advertisements
प्रश्न
What are magnetic keepers? What are they used for?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Match the following
| Column A | Column B |
| A) Steel | 1) to store magnets |
| B) Soft iron | 2) temporary magnet |
| C) Use in electric bell | 3) permanent magnet |
| D) Magnetic keepers | 4) electromagnet |
Define the following term regarding a bar magnet:
Magnetic field
Define the following term regarding a bar magnet:
Effective length
Which magnet will you use?
You are lost in a forest.
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.
Maximum iron filings stick in the middle of a bar magnet when it is brought near them.
One of the following is an example for a permanent magnet.
List out the uses of magnets.
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?
