Re: Does a Magnet's force weaken witht the distance cube?


guskz@xxxxxxxxxxx wrote:
http://hyperphysics.phy-astr.gsu.edu/hbase/forces/isq.html#isq


The link above shows Gravity, Light(photons), and Charge (I believe
sound waves also): all these weaken with the distance square.

How about Magnets...I think there's is the distance cube which is
strange since EM waves are made of photons and photons above weaken
with the distance square???

Photons don't "weaken" with distance. A photon that
arrives here from 1 billiion light years away is the same
photon that left its source.

Magnetic fields fall off as 1/r^3 because all the magnetic
sources we know are dipoles, with a north and south pole.
The electric field from an electric dipole (a clump of
positive charge some distance away from a clump of
negative charge) also falls off as 1/r^3.

- Randy

.

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