I should know this, I did a physics degree many years ago, and it should be easy to find the right equations online, but I can't seem to find the right search term.
I need the equations to convert from magnetic pull strength (usually given in kg, clearly in reality a measure of kg*9.81 to give N) force to get me an understanding of the magnetic flux density (mT). Just like for gravity you have a mass, and for electrostatics a charge, I want to work back from the pull strength to get a magnetic "charge" which I can then drop in to an inverse cube law and get the milliTesla field strengths at various distances along the axis from a disc shaped magnet.
Can anyone remember the equations? Is there an extra variable I'd need to supply from somewhere which means that knowing the pull strength in newtons at the magnet's surface, and the distance of this surface away from an imaginary point at the magnet's centre where one can pretend the dipole resides, won't be enough to let me derive the mT flux density with distance graph?
Thanks