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

If you consider a magnetic dipole (all magnets are dipoles as in reality it
is a current loop, there is no magnetic field) then each magnetic "pole"
(these don't exist) exhibits the inverse square law of force, however at a
distance the dipole field force obeys an inverse cube law.

A short dipole field has lines of force as circles through the dipole, they
may be calculated using the mathematics of Biot-Savart and modelling the
short dipole as a current loop. Otherwise you have to work out a
complicated equation using a vector diagram of two magnetic poles n and s
close together and follow the tangent to the curve, the calculation requires
the use of an extra dimension but I have forgotton now how the mathematics
went.

--
Chris
"G=EMC^2 Glazier" <herbertglazier@xxxxxxxxx> wrote in message
news:17575-441B3E74-549@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
QCD The magnetic force obey's the inverse square law. That means 3
feet from the magnet its 9 times weaker. Don't feel to bad about
this,for the force still makes it all the way to infinity. TreBert



.

Relevant Pages

  • Re: Redshift without expansion
    ... Pretend the dipole flips once every second and travels 10 meters in 1 ... flipping rate, it just appears to you they have because you move away ... Dont forget the saying a picture is worth a thousand words. ... ac current that produces the flipping magnets on the paper. ...
    (sci.astro)
  • Re: KRS: Final thoughts on North Pole
    ... the North Magnetic Pole, ... The dipole axis/surface intersect is the phyical point where the ... but based on current and aurora measurments of the past it is known ... axis where the dip maximum (the point a circle of magnets would go ...
    (sci.archaeology)
  • Re: Magnetic fields doing work?? No way ... but...
    ... a magnetic dipole in a nonuniform magnetic field which is ... the dipole field of an electron. ... fields have energy, momentum, and whatnot, the source object produces ... (permanent magnets, electromagnets, fundamental particles with intrinsic ...
    (sci.physics.relativity)
  • Re: Magnetic fields doing work?? No way ... but...
    ... a magnetic dipole in a nonuniform magnetic field which is ... the dipole field of an electron. ... (permanent magnets, electromagnets, fundamental particles with intrinsic ... spinning charge or non-spinning charge, it doesn't matter, it can do no ...
    (sci.physics.relativity)
  • Re: interaction of two free magentic dipoles
    ... |>>> So representing the magnets as interacting finite dipoles (ie two ... |> finite dipole by using the inverse-square law between the ... spherical integration of particle's energy in my model as you may ... |>>> from the inverse square law between relevant pairs of poles. ...
    (sci.physics)
Quantcast