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प्रश्न
Give short account of the earth’s magnetic field.
उत्तर
When a bar magnet is suspended freely, then it aligns itself along geographical north-south direction i.e. north pole of the magnet points towards the geographical north and south pole of the magnet points towards geographical south direction. William Gilbert suggests that earth itself behaves as a huge magnet. It was assumed that:
- A huge magnet is burned at the center of the earth.
- The south end of earth’s magnet is towards the earth’s geographic north and vice-versa.
- The axis of the earth’s magnet is not in line with the geographical axis but makes a small angle with it.
The diagram on next page show the earth as a magnet and the magnetic lines of force around it
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संबंधित प्रश्न
Fill in the blank.
A magnet has ............. poles.
How are the north and south poles of a magnet located? Explain.
A small magnet is suspended by a silk thread from a rigid support such that the magnet can freely swing. How will it rest? Draw a diagram to show it.
State two evidences of the existence of earth's magnetic field.
Define the magnetic field.
Define the terms magnetic declination and dip with reference to a freely suspended magnet.
A freely suspended bar magnet is always pointing along the ________ north-south direction.
Consider the statement given below and choose the correct option.
Assertion: The Earth’s magnetic field is due to iron present in its core.
Reason: At a high temperature a magnet loses its magnetic property or magnetism.
Earth acts as a huge bar magnet. Why? Give reasons.
Write a note on Magnetar.
