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Question
Earth acts as a huge bar magnet. Why? Give reasons.
Solution
- 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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