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The earths rotation creates it. Or was this rhetorical.

• nyc111 2y ago
  No, it was a serious question. Does anything that rotates create a magnetic field even if it is not an electrical material?
  • pmontra 2y ago
    The iron core but there are many open questions https://news.mit.edu/2020/origins-earth-magnetic-field-mystery-0408 https://news.mit.edu/2020/origins-earth-magnetic-field-myste...
  • cyphax 2y ago
    In case of Earth, Wikipedia describes [1] it as being "[..] generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in Earth's outer core". This makes Earth a geodynamo [2]. (The aforementioned Wikipedia page is actually really long and detailed, a lot more than I would have thought) [1] https://en.wikipedia.org/wiki/Earth%27s_magnetic_field https://en.wikipedia.org/wiki/Earth%27s_magnetic_field [2] https://en.wikipedia.org/wiki/Dynamo_theory https://en.wikipedia.org/wiki/Dynamo_theory
  • fallingknife 2y ago
    No, otherwise Mars would have a magnetic field just like Earth.
  • beeforpork 2y ago
    Basically: moving electric charge = magnetic field. It's equivalent, that's why it's called electromagnetism: it's one and the same force. The Earth rotates, liquid iron (inside Earth) flows => a current flows in the iron => there is a magnetic field.