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by spappal
2071 days ago
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The reason for magnetic field strength falling off as 1/r^3 is interesting: the biot-savart law says that magnetic field falls off as 1/r^2 from a magnetic source, but in reality sources tend to be better approximated by magnetic dipoles than magnetic monopoles. A "north pole" is always accompanied by a "south pole", and at distance there are "interaction effects" such that a part of the field strength is "canceled out". https://en.wikipedia.org/wiki/Magnetic_dipole https://en.wikipedia.org/wiki/Magnetic_monopole |
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