# Eddy current - What determines the intensity of eddy current braking?

In the demonstration where a magnet is slid down a tube of conductive material, the magnet drops at a slowed and constant rate due to eddy current braking effect.

What factors will contribute to the intensity of this braking effect? I suppose one factor would be the strength of the magnet. However, it seems like the conductivity of the tube is not simple proportional to the braking effect, since I have read in other questions that a superconductor would in fact offer no resistance in such a scenario. (I might be wrong on that, but I hope you do not dwell on it too much in your answer/comment.)

$$F_{max}=VvB^2σ$$
where $$V$$ is the volume of the tube within the magnetic field $$B$$, $$v$$ is the velocity and $$σ$$ is the conductivity of the tube.
For a tube, you can consider $$V$$ to be equal to a section of tube roughly equal to the length of the magnet, as long as the inner and outer radii of the tube are both not much bigger than the magnet.