The relationship between friction and load, quantified three centuries ago, has an exception when the interaction causes ...

Traditional magnetic separators, however, present a challenge: they generate a magnetic force that is very high near the side of the vessel closest to the magnet and decreases rapidly with distance.

In the absence of substantial B g, this tension force is much reduced. This leads to the eruptive behaviour shown in Extended Data Fig. 3, where the J T profile remains relatively uniform throughout ...