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प्रश्न
Write a short note on lighting conductors.
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
How will you test whether a given rod is made of iron or not?
Fill in the blank.
Magnetic poles always exist in ...............
Define the following term regarding a bar magnet:
Magnetic axis
How will you do this?
Explain that a magnet has a certain magnetic field.
Fill the blank spaces in the table given below:
| Nature of bar | Action of compass needle | |
| North Pole | South Pole | |
| Non-magnetic | No action | ________ |
| ________ | attracted | attracted |
| North pole of a bar magnet | ________ | _________ |
| ________ | attracted | repelled |
Explain the following:
Resistance of a conductor
Consider the statement given below and choose the correct option.
Assertion: Iron filings are concentrated more at the magnetic poles.
Reason: The magnets are so sharp.
What is the connection between electricity and magnetism?
