Originally posted by Markoul
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thats not true, ive got TOOOOOONS of images of a ring magnet UNDER the ferrocell shows the field INSIDE the ring.

such as<<<




. This should actually work with any shape of magnet. Put for example a disk (no hole at the center) magnet inside a larger ring magnet without these two in contact. The field inside should be confined and show up like a single torus. You also could use instead of large ring magnet to confine the field, Mumetal casing to put inside a magnet under observation (i.e. use a loudspeaker magnet metal casing its made out of mumetal) but be careful your magnet strength not to exceed the saturation level of the mumetal which is 760 mT otherwise the field will again leak out.
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