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Magnetism

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29 May 2009 21:02:33 IST

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why the earth is considered an electromagnet? what is the source of the current?

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why the earth is considered an electromagnet?what is the source of the current?

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SUJIT khandai

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Joined: 7 Jun 2009

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7 Jun 2009 11:30:49 IST

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the coz is....potential difference...in case of electric currentif u r talking abt water current..then it's difference in concentration ...if u r talking abt air current then it's the pressure difference...

edison

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29 Jan 2012 21:43:52 IST

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The simple question "how does the Earth get its magnetic field?" does not have a simple answer. It does seem clear that the generation of the magnetic field is linked to the rotation of the earth, since Venus with a similar iron-core composition but a 243 Earth-day rotation period does not have a measurable magnetic field. It certainly seems plausible that it depends upon the rotation of the fluid metallic iron which makes up a large portion of the interior, and the rotating conductor model leads to the term "dynamo effect" or "geodynamo", evoking the image of an electric generator.

Convection drives the outer-core fluid and it circulates relative to the earth. This means the electrically conducting material moves relative to the earth's magnetic field. If it can obtain a charge by some interaction like friction between layers, an effective current loop could be produced. The magnetic field of a current loop could sustain the magnetic dipole type magnetic field of the earth. Large-scale computer models are approaching a realistic simulation of such a geodynamo.

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