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  2. Earth's magnetic field - Wikipedia

    en.wikipedia.org/wiki/Earth's_magnetic_field

    The remaining terms predict that the potential of a dipole source (ℓ=1) drops off as 1/r 2. The magnetic field, being a derivative of the potential, drops off as 1/r 3. Quadrupole terms drop off as 1/r 4, and higher order terms drop off increasingly rapidly with the radius. The radius of the outer core is about half of the radius of the Earth.

  3. Dynamo theory - Wikipedia

    en.wikipedia.org/wiki/Dynamo_theory

    [12] [13] Mercury, despite its small size, has a magnetic field, because it has a conductive liquid core created by its iron composition and friction resulting from its highly elliptical orbit. [14] It is theorized that the Moon once had a magnetic field, based on evidence from magnetized lunar rocks, due to its short-lived closer distance to ...

  4. History of geomagnetism - Wikipedia

    en.wikipedia.org/wiki/History_of_geomagnetism

    The earliest ideas on the nature of magnetism are attributed to Thales (c. 624 BC – c. 546 BC). [1] [2] In classical antiquity, little was known about the nature of magnetism. No sources mention the two poles of a magnet or its tendency to point northward. There were two main theories about the origins of magnetism.

  5. Mathematical descriptions of the electromagnetic field

    en.wikipedia.org/wiki/Mathematical_descriptions...

    The members of the algebra may be decomposed by grade (as in the formalism of differential forms) and the (geometric) product of a vector with a k-vector decomposes into a (k − 1)-vector and a (k + 1)-vector. The (k − 1)-vector component can be identified with the inner product and the (k + 1)-vector component with the outer product. It is ...

  6. North magnetic pole - Wikipedia

    en.wikipedia.org/wiki/North_magnetic_pole

    Before magnetism was well understood, the north-seeking pole of a magnet was defined to have the north designation, according to their use in early compasses. However, opposite poles attract, which means that as a physical magnet, the magnetic north pole of the Earth is actually on the southern hemisphere.

  7. Warriors' Stephen Curry out with knee soreness for Wednesday ...

    www.aol.com/sports/warriors-stephen-curry-knee...

    The two-time NBA MVP leads the Warriors this season with 22.4 points per game, shooting 44% (60-for-135) on 3-pointers. Additionally, he's averaging 6.5 assists and 5.4 rebounds.

  8. States with the Highest and Lowest Property Tax Rates - AOL

    www.aol.com/states-highest-lowest-property-tax...

    9. Kansas. When it comes to expensive states for homeowners, the state of Kansas doesn’t often come to mind. But it has an average property tax rate of 1.26%.

  9. Terrestrial magnetism - Wikipedia

    en.wikipedia.org/?title=Terrestrial_magnetism&...

    This page was last edited on 13 July 2016, at 01:13 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...