AIIMS 2018 Physics Earth's Magnetism Assertion Reason Question
Assertion : The earth′s magnetic field is due to iron present in its core.
Reason : At a high temperature magnet losses its magnetism.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
Correct Answer
Detailed Explanation
The assertion that the magnetic field of Earth is due to moving charged particles in the atmosphere is incorrect; rather, it originates from the movement of molten iron and nickel in the Earth's outer core, which generates the geomagnetic field through the dynamo effect. Additionally, the statement about the magnetic moment decreasing with temperature is misleading; while thermal agitation can affect magnetic materials, the Earth's magnetic field is primarily influenced by geophysical processes rather than temperature changes in the atmosphere. Other options are not provided, but any alternative assertions would likely misinterpret the fundamental sources of Earth's magnetism. Understanding these concepts is crucial for grasping the dynamics of Earth's magnetic field and its relation to temperature and material properties.
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