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TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.0what do you mean by 'straight' ? it does not go exactly from pole to pole, and has reversed a number of times in the history of the earth

Inopeki
 3 years ago
Best ResponseYou've already chosen the best response.1I know that its not aligned with the geographic poles but do we know that it is straight as a line and not curved?

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.0If you are imagining a physical pole that can be bent, then that's not accurate. We don't know what actually created the magnetic field of the earth, but it is hypothesized to be caused by electric charge in the earth's core. as the core of the earth rotates the moving charge creates a magnetic field, just like an electromagnet. here is a diagram of sorts:dw:1329925793919:dwthis is a circular wire carrying an electric current I. A current produces a magnetic field B that curls around the wire.

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.0here's my screwy attempt to draw in the induced Bfield:dw:1329925959495:dwso the molten core of the earth behaves like a circular current as it spins, which induces a unidirectional Bfield. Nor 'straightness' required

Inopeki
 3 years ago
Best ResponseYou've already chosen the best response.1So earth acts like a coil wrapped around some kind of core?

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.0yeah, more or less the outer core is like a liquid shell of electric charge, and as it spins it acts like a circular coil of current, so it creates a Bfield perpendicular to the plane of rotation
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