3 ms·
An interesting tidbit talking about the coil used to push the magnet at the end of the bob (the internal mechanism of the kitty hand): Why does the coil us
by abetusk 8y ago
An interesting tidbit talking about the coil used to push the magnet at the end of the bob (the internal mechanism of the kitty hand):
Why does the coil use air core rather than something
like iron that would concentrate the magnetic field?
Because then the magnet would want to stick to it.
Is there a nonmagnetic material that could be used to concentrate the magnetic field? Aluminum?
- lmm 8y agoI'm only going by what I just read on https://en.wikipedia.org/wiki/Magnetic_core https://en.wikipedia.org/wiki/Magnetic_core , but it seems like a core only works by being magnetic itself. Note that "air core" is a term of art; if there's a nonmagnetic (e.g. plastic or ceramic) core it's still called "air core".
- blattimwind 8y agoCopper being diamagnetic has a very low magnetic permeability, basically the same as air, but now you have an eddy current brake.