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The usual strategy for reducing static magnetic fields consists of surrounding the volume of interest with a layer of ferromagnetic material (e.g. iron). See also my other video about ferromagnetic shielding: • Shielding properties of ferromagnetic mate... . However a rotating conducting non-ferromagnetic shield could be used. This can be called dynamic shielding. In this video, a hollow rotating cylinder of alluminium is able to reduce the magnetic field at his center. A permanent magnet generates the magnetic field. The magnetic field is measured at the cylinder's center by a Hall-effect sensor. The measurements is made with the cylinder still and with the cylinder rotating. It is possible to see a good repeatability and a reduction of the magnetic field from about 95mT to about 75 mT (the rotation of the cylinder reduces the field at 77% of the value with the static cylinder). The magnetic field reduction is due to Eddy currents induced in the cylinder. Eddy currents induced by motion act to reduce the magnetic field inside the cylinder. An interesting paper regarding this topic is available at: https://ieeexplore.ieee.org/document/....