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प्रश्न
Earth acts as a huge bar magnet. Why? Give reasons.
उत्तर
- A freely suspended magnetic needle at a point on the Earth comes to rest approximately along the geographical north–south direction.
- This shows that the Earth behaves like a huge magnetic dipole with its magnetic poles located near its geographical poles.
- The north pole of a magnetic needle approximately points towards the geographic north (NG).
- The magnetic north pole of the needle is attracted by the magnetic south pole of the Earth (Sm), which is located at the geographic north NG.
- Also, the magnetic south pole of the needle is attracted by the magnetic north pole of the Earth (Nm), which is located at the geographic south SG.
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संबंधित प्रश्न
Fill in the blank.
A freely suspended magnet points in the ......................... direction.
Fill in the blank.
A magnet has ............. poles.
Fill in the blank.
A freely suspended magnet always comes to rest in the ................. direction.
You are provided with two similar bars, one is a magnet and the other is a soft iron. How will you distinguish between them without the use of any other magnet or bar?
[Hint : A magnet when suspended freely will rest only in the north-south direction, but the soft iron bar will rest in any direction]
Two like magnetic poles:
Define the geographical meridian.
Give short account of the earth’s magnetic field.
Define the terms magnetic declination and dip with reference to a freely suspended magnet.
Though Earth is acting as a huge bar magnet it is not attracting other ferromagnetic materials. Why? Give reasons.
Write a note on Magnetar.
