What would happen if you crushed a magnetic field to an ever decreasing size?
How small could the field possibly go? Is there a limit on how small it could get?
Is there a maximum field density based on the size?
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It is theoretically possible to generate very high magnetic fields (tens of millions of oersteds) with rapid squeezing conductive shells covering the magnetic flux.
Sufficiently rapid compression of shells can be achieved with cumulative directional blast.
The converging detonation wave then produces plastic compression and deformation of the conductive cylinder or other type of massive loop covering the magnetic flux.
The principle is that the explosive energy goes into the energy magnetic field, produced by eddy currents flowing in the compressible conducting shell. I remember we did a relatively simple calculation in a lecture.