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State whether true or false. Earth is a big natural magnet.
(a). True
(b). False

seo-qna
Last updated date: 27th Mar 2024
Total views: 407.1k
Views today: 11.07k
MVSAT 2024
Answer
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- Hint- In order to comment whether this given statement is true or false, first we will understand the properties of Earth and then we will proceed further by understanding the magnetic properties of earth and we will conclude after comparing the property of magnet and earth.

Complete step-by-step solution -

There is a theory that the magnetic nature of the earth is due to the presence of metals in the core of earth.
Magnetic fields around planets behave in the same way as a bar magnet. But at high temperatures, metals lose their magnetic properties. So it’s clear that Earth’s hot iron core isn’t what creates the magnetic field around our planet.
Instead, Earth’s magnetic field is caused by a dynamo effect.
The effect works in the same way as a dynamo light on a bicycle. Magnets in the dynamo start spinning when the bicycle is pedaled, creating an electric current. The electricity is then used to turn on the light.
This process also works in reverse. If you have a rotating electric current, it will create a magnetic field.
On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet.
Thus, this leads to the fact that earth behaves like a big natural magnet.
Hence, the statement “Earth is a big natural magnet” is true.
So, option A is the correct option.

Note- The magnetic field is extremely important to sustaining life on Earth. Without it, we would be exposed to high amounts of radiation from the Sun and our atmosphere would be free to leak into space. This is likely what happened to the atmosphere on Mars. As Mars doesn’t have flowing liquid metal in its core, it doesn’t produce the same dynamo effect. This left the planet with a very weak magnetic field, allowing for its atmosphere to be stripped away by solar winds, leaving it uninhabitable.
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