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
You are given a magnet. How will you use it to find north-south direction at a place?
Fill in the blank.
The perpendicular bisector of the line joining the two poles of a magnet is called ...................
Distinguish between the two methods of making artificial magnets.
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 |
Draw lines of force surrounding a bar magnet when it is placed in the magnetic meridian with its north pole pointing geographic south.
Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.
Mark on the diagram the poles of the second magnet,
Match the following.
| Magnetite | Magnetic lines |
| A tiny pivoted magnet | Natural magnet |
| Cobalt | Compass box |
| Closed curves | Ferromagnetic material |
| Bismuth | Diamagnetic material |
You are provided with two identical metal bars. One out of the two is a magnet. Suggest two ways to identify the magnet.
What is the connection between electricity and magnetism?
Give the uses of magnets in everyday life.
