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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
In which direction does a suspended bar magnet come to rest? Give reason.
Describe an experiment to illustrate that like poles repel while the, unlike poles, attract.
How are the north and south poles of a magnet located? Explain.
State if the following statement is true or false. Correct the statement if it is false.
If a bar magnet is cut in two pieces, then one piece will have only the north pole and the other will have only the south pole.
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]
A charge of 75 C is brought from infinity to a given point in an electric field, when amount of work done is 3.75 J. Calculate the electrical potential at that point.
Select the correct option:
Current in a circuit flows:
Define the magnetic meridian.
Earth acts as a huge bar magnet. Why? Give reasons.
Write a note on Magnetar.
