Advertisements
Advertisements
Question
How will you do this?
Find the north pole of a magnet.
Advertisements
Solution
- Tie a thread to the centre of the magnet and hang it freely from a stand.
- Wait for the magnet to settle. As it hangs, it will align itself along the Earth's magnetic field in a north-south direction.
- The end of the magnet that points towards the geographic north will be the south pole of the magnet (since opposite poles attract).
Therefore, the other end, which points toward the geographic south, will be the north pole of the magnet.


RELATED QUESTIONS
State two properties of a bar magnet ?
You are given two similar bars. One is a magnet and the other is of soft iron. How will you distinguish and identify them ?
Describe a simple experiment to illustrate that like poles of two magnets repel each other while the unlike poles attract ?
Name four appliances which work using electricity ?
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 |
Answer the following in detail.
List four methods of magnetizing a magnetic substance.
Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.

What is the material of darkened part?
With the help of a diagram explain the following:
Magnetisation of an iron bar by a single touch method.
Distinguish between
Natural and artificial magnets.
Match the following.
| Magnetite | Magnetic lines |
| A tiny pivoted magnet | Natural magnet |
| Cobalt | Compass box |
| Closed curves | Ferromagnetic material |
| Bismuth | Diamagnetic material |
