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प्रश्न
Write a short note on lighting conductors.
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उत्तर
Lightening conductor is a device used to safeguard the large buildings against the lightening of the thunderstorm. Normally, they are fitted on the top of tall buildings as a safety device. It consists of few metal spikes fitted to the highest part of the building and connected to thick copper strip which is buried inside the earth.
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संबंधित प्रश्न
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 |
State four important properties of a bar magnet?
Define the following term regarding a bar magnet:
Effective length
Select the correct option:
The place around a magnet where its influence can be detected is called:
Describe two simple experiments to support the statement that magnetism is a property of the molecules of a magnet.
Match the following.
| Magnetite | Magnetic lines |
| A tiny pivoted magnet | Natural magnet |
| Cobalt | Compass box |
| Closed curves | Ferromagnetic material |
| Bismuth | Diamagnetic material |
Which is not attracted by a magnet?
What will happen when we place magnets near cell phones, computers, and DVDs?
