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प्रश्न
Write a note on Earth’s magnetism.
उत्तर
- Earth has been assumed or imagined by scientists as a huge magnetic dipole.
- The south pole of the imaginary magnet inside the Earth is located near the geographic north pole and the north pole of the Earth’s magnet is located near the geographic south pole.
- The line joining these magnetic poles is called the magnetic axis.
- The magnetic axis intersects the geographic north pole at a point called the north geomagnetic pole or northern magnetic pole.
- It intersects the geographic south pole at a point called the south geomagnetic pole or southern magnetic pole.
- The magnetic axis and the geographical axis (axis of rotation) do not coincide with each other.
- The cause of the Earth’s magnetism, are as follows.
- Masses of magnetic substances in the Earth
- Radiations from the Sun
- Action of the Moon
APPEARS IN
संबंधित प्रश्न
In which direction does a suspended bar magnet come to rest? Give reason.
Suggest one way to recognize the magnetic field of the earth.
How are the north and south poles of a magnet located? Explain.
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]
State two evidences of the existence of earth's magnetic field.
Two like magnetic poles:
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.
Define the geographical meridian.
Give short account of the earth’s magnetic field.
What is the diameter of the magnetar?
