I know that magnetic fields can be redirected, but... given a situation where you have static magnetic field over a large area, and you want to quickly change the magnetic field strength. Is it feasible to redirect nearby fields and curve the field towards a single point, thus increasing flux density and strength?
the answer with the cone is great and all but are there any alternatives?
Answer
Yes, it is possible to guide magnetic field lines using a shaped magnetic material. Just as field lines concentrate when entering the south pole of a magnet from a large area, an external magnetic field can be "gathered" using, for example, a cone-shaped piece of iron. The cone can be positioned such that the static field spread over a large area enters the wide end of the cone. The iron confines the field and will guide it to the tip of the cone, where it will emerge with a much higher density and, therefore, a much higher magnetic field strength.
This will, of course, reduce the field to the sides of the cone, since this method won't increase the total magnetic field present in the region. The field lines that used to occupy that space are now simply confined inside the cone.
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