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.

Justify

Among the four given magnets, the iron bar marked with (a) is the strongest magnet since many filings are attached to it.
The iron bar that has no filings attached to it is not a magnet. Such a piece is an iron bar (b).

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Uses of Magnets

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Chapter 13: Fun with Magnets - Very Short Answer Questions [Page 82]

Chapter 13 Fun with Magnets
Very Short Answer Questions | Q 10. | Page 82

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

Take a glass of water with a few pins inside. How will you take out the pins without dipping your hands into water?

______ will also get affected by magnetic field.

Analogy:

Electromagnet: Magnetic crane.
Ordinary magnet: ______.

What are the uses of magnets?

Write a note on the Mangle train.

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?

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.

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.