Question
Download Solution PDFThe reason for Earth's magnetic field is-
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
- Earth's magnetism: The cause of the magnetic field at earth’s core is still not clear
- Initially, we assume, the magnetic field was caused by a giant bar magnet placed approximately along the axis of rotation of the earth and deep in the interior
- But now we consider the reason for the magnetic field to arise due to electrical currents produced by the convective motion of metallic fluids (consisting mostly of molten iron and nickel) in the outer core of the earth.
- This is known as the dynamo effect.
EXPLANATION:
- The magnetic field of the Earth is created due to the circling currents inside the core. This is also called the geomagnetic field. So option 1 is correct.
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