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प्रश्न
Take a glass of water with a few pins inside. How will you take out the pins without dipping your hands into water?
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उत्तर
If we keep a strong bar magnet above the glass of water, all pins inside the water come up and attract the magnet.
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संबंधित प्रश्न
Analogy:
Electromagnet: Magnetic crane.
Ordinary magnet: ______.
Give 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?
In a bar magnet, magnetic attraction is ______ near its ends.
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.
- Which of the iron bar is likely to be the strongest magnet?
- Which of the iron bars is not a magnet? Justify your answer.
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.
Suggest an arrangement to store a U shaped magnet. How is this different from storing a pair of bar magnets?
