Question: If a magnet is put under too much pressure will happen?

Bernard Ennis answered on 14 Nov 2015:

By pressure I assume you mean physical force, rather than magentism? In the fist case, the material will start to deform at some point it will break. The amount of deformation varies from material to material and this is what we call ductility. At some point the applied force will be too great for the material to bear and it will break. What we try to do is to make a balance between the ductility and the strength (resistance to fracture) and each application has different requirements. eg a bridge requires a high strength, but not much ductility (you don’t want the bridge to start bending when you walk across it). On the other hand the outer panels of a car don’t need to be that strong, but car makers like to be able to deform the material to give the car its shape.

As for magnetic force, if too much magnetic field is applied, then the material will heat up due to internal resistance which can (a) lower its strength, (b) reduce its magnetism and (c) cause other components to heat up and possibly catch fire.