By putting magnets next to each other in a particular arrangement, the field is concentrated on one side. This channel has some other interesting hands-on videos like this (youtube.com) too, e.g. Light confinement in fiber optics (youtube.com).
By putting magnets next to each other in a particular arrangement, the field is concentrated on one side. This channel has some [other interesting hands-on videos like this](https://www.youtube.com/playlist?list=PLuXvGpDxY2bAqyOSNBppUv2RJQByE5Spe) too, e.g. [Light confinement in fiber optics](https://www.youtube.com/watch?v=Ik5Z0sIQWag).
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