Does the force between two magnetic poles ever reach zero? If we hold two magnetic like-poles together and start to move them away, would the repelling force reach absolute zero at certain point?
In that scenario, as a layman, I think that there is something paradoxical :(
We can never reach absolute ZERO in Physics. Theoretically, it will always be bigger than zero... it just gets smaller and smaller... ad infinitum. And that reminds me of Zeno paradox.
 A: Like gravity or electrostatic attraction, magnetism reduces with distance. However, while the first 2 have an inverse square law (the force diminishes with the square of the distance), the magnetic force diminishes with the 4th power of the distance, or $f\propto{r^{-4}}$. Hence it reduces much faster than electric or gravitational forces.
However, even if magnetism reduces very quickly, we still see that, no matter how large $r$ gets, the resulting force never reaches $0$
A: The magnitude of the force between the two magnets will approach zero as they get further and further apart. It never (in theory) actually reaches zero because they are always a finite distance apart - we say the force approaches a limit of zero as the distance between them approaches (but never reaches) infinity. Of course, the force will eventually become too small to measure, so we might say it becomes zero for all practical purposes.
The term “absolute zero” is usually reserved in physics for a temperature that is so low that all molecular and atomic motion ceases. It is true that the laws of thermodynamics mean that this theoretical temperature can never be achieved in practice. However, many other physical attributes can (and do) become zero.
