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प्रश्न
People who made mariner’s compass for the first time.
विकल्प
Indians
Europeans
Chinese
Egyptians
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उत्तर
Chinese
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संबंधित प्रश्न
Answer the following.
Why is it not possible to isolate a single magnetic pole?
Tick the most appropriate answer.
The surest test of magnetism is
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 |
Describe two simple experiments to support the statement that magnetism is a property of the molecules of a magnet.
Draw lines of force surrounding a bar magnet when it is placed in the magnetic meridian with its north pole pointing geographic south.
Define the term Effective length of a magnet
Write a short note on lighting conductors.
Explain the following:
Resistance of a conductor
Match the following.
| Magnetite | Magnetic lines |
| A tiny pivoted magnet | Natural magnet |
| Cobalt | Compass box |
| Closed curves | Ferromagnetic material |
| Bismuth | Diamagnetic material |
Why it is not advisable to slide a magnet on an iron bar back and forth during magnetising it?
