To protect the machine of a watch from external magnetic field ,its box should be made of a.paramagnetic material b.dimagnetic material c. ferromagnetic material d.non-magnetic materialans:c-ferromagnetic material.also give the correct explanation.
Could be the air suspension leaking. If it has over 100k miles, most likely a leak. Have it checked out by a certified BMW mechanic. Pretty expenive to fix too.
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Diamagnetic cannot be used since the watch as its own internal magnetic fields also and diamagnetic material will distort it by repulsion. Paramagnetic cannot be used since it won't protect the watch from external magnetic fields, as it will be affected by any magnetic field present at a given time. Ferromagnetic however, retains its magnetisation, ie. the magnetic property it gains depending upon the magnetic field of the watch kept inside the box. and then for small external magnetic fields, the magnetised ferromagnetic material will protect the watch kept inside as it will be like a small magnet itself, repelling fields outside the box, and not affecting the watch inside ---- HOWEVER, for quite strong magnetic fields, even ferromagnetic will become useless.But that is the customer's responsibility. (and non magnetic material will reduce optimivity of watch since when we use the watch outside the box, it is always subjected to magnetic fields (however weak they may be) and this sudden change in surrounding magnetic field can hinder watch's performance) So the best choice is ferromagnetic material obviously!
