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What will happen to the weight of the body at the south pole, if the earth stops rotating about its polar axis?
What will happen to the weight of the body at the south pole, if the earth stops rotating about its polar axis?
Updated On: Jun 27, 2023
- No change
- Increases
- Decreases but does not become zero
- Reduces to zero
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The Correct Option is A
Approach Solution - 1
As weight of body on pole $ =mg $ and g does not change at the pole due to rotation of earth, so there is no change in the weight of body.
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Approach Solution -2
The rotation of the earth at the poles has no effect on the body's weight at the pole, which is mg. Therefore, the body's weight has not changed.
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Notes on the earth's magnetic field
Concepts Used:
Earth’s Magnetic field
The Earth's magnetic field stretches millions of kilometers into space and resembles a bar magnet. The earth's magnetic pole is positioned between the Northern Pole and the North Pole's Antarctic magnets. That is why a compass magnet's north pole points north (north and south poles attract).
The Earth's magnetic field extends far and wide, but it is very small in terms of field power. It has a field power of merely 40,000 nT as compared to a refrigerator magnet which has a power of 107 nT.
Theory of Earth’s Magnetism
- The Dynamo Effect: The outer core of the earth has molten Iron and other heavy elements in liquid form. The inner core solidifies under the influence of gravity. Therefore, the motion of metallic fluids in the outer core of the earth causes an electric current. Thus, the earth gets its own magnetic field lines.
- Ionization of the Outer Layers: This theory tells us that the rotation of the earth in its own axis produces strong electric current due to the ionization of the outer layers of earth. This produces magnetism due to the movement of the ions. However, the magnetic field will be very weak. The Dynamo Effect is the more acceptable theory.
Components of Earth’s Magnetic Field
These are the components that are responsible for the magnitude and direction of the magnetic field of the earth at a given location:
- Magnetic Declination
- Horizontal Component of Earth’s Magnetic Field
- The angle of Dip or Magnetic Inclination
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