Imagine a hollow metal sphere with rods sticking out from all sides like a ball-shaped porcupine.;-)
The sphere is steel or some other ferromagnetic substance and the rods are electromagnets. The rods are aligned so all the N poles face inward and all the S poles face outward. All the rods are lined up precisely to the center of the sphere (to some impossible degree of precision) The rods are energized and inside, the magnetic fields are forced to focus in the center of the sphere. Would the fields simply repel each other like inflated balloons, leaving a zero-field void in the center, or would the repulsion force the field density to climb and squeeze down to a super tiny point in the center? Since the fields have no substance, could they be forced to focus down like a 3-dimensional needle?
The sphere is a conductor. No magnetic fields can exist INSIDE a conductor, since charges flow freely to cancel it out. You would probably end up with just a lump of magnetic metal, unless the currents created were large enough to melt the ball.
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