You are provided with an iron needle. How will you magnetize it?

Answer in Brief

Place the iron needle on the table.
Take a bar magnet and place one of its poles near one edge of the iron needle.
Rub from one end to another without changing the direction of the pole of the magnet.
Repeat the process 30 to 40 times. The needle will be magnetized.
If it will not attract pin or iron fillings continue the same process for some more time.

shaalaa.com

Uses of Magnets

Is there an error in this question or solution?

Chapter 1 Magnetism
Evaluation | Q IX. 1. | Page 13

What are the objects affected by a magnetic field?

What are the uses of magnets?

What is meant by a mag-stripe?

Write a note on:

Magstripe:

The arrangement to store two magnets is shown by figures (a), (b), (c) and (d) in the following figure. Which one of them is the correct arrangement?

Three magnets A, B and C were dipped one by one in a heap of iron filing. Figure shows the amount of the iron filings sticking to them.

The strength of these magnets will be

Four identical iron bars were dipped in a heap of iron filings one by one. Figure shows the amount of iron filings sticking to each of them.

Four identical iron bars were dipped in a heap of iron filings one by one. Fig. 13.5 shows the amount of iron filings sticking to each of them.

Which of the iron bars is not a magnet? Justify your answer.

Describe the steps involved in magnetising an iron strip with the help of a magnet.

Boojho kept a magnet close to an ordinary iron bar. He observed that the iron bar attracts a pin as shown in the following figure.

What inference could he draw from this observation? Explain.