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Inopeki Group Title

How do we know that the earths "inner magnet" is entirely straight?

  • 2 years ago
  • 2 years ago

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  1. TuringTest Group Title
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    what 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

    • 2 years ago
  2. Inopeki Group Title
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    I know that its not aligned with the geographic poles but do we know that it is straight as a line and not curved?

    • 2 years ago
  3. TuringTest Group Title
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    If 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:dw|this is a circular wire carrying an electric current I. A current produces a magnetic field B that curls around the wire.

    • 2 years ago
  4. TuringTest Group Title
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    here's my screwy attempt to draw in the induced B-field:|dw:1329925959495:dw|so the molten core of the earth behaves like a circular current as it spins, which induces a uni-directional B-field. Nor 'straightness' required

    • 2 years ago
  5. Inopeki Group Title
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    So earth acts like a coil wrapped around some kind of core?

    • 2 years ago
  6. TuringTest Group Title
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    yeah, 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 B-field perpendicular to the plane of rotation

    • 2 years ago
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