Amazing physics

[raif_nijem]

this is just amazing,,,,

[Blair_355]

damn that shit looks crazy, how is it done?

[raif_nijem]

dont know

[bmxer99]

excellent opposing magnetic force?

[Ford88]

witchcraft and trickery

[mattlikespeople]

The Meissner effect effectively tells us that, in a weak applied field (at higher fields this is not necessarily the case), a superconductor expels all magnetic flux. Although the magnetic field is completely expelled from the interior of the superconductor, there is not a sharp transition at the edges of a sample, rather there is a rapid decay of field into the sample over a distance called the penetration depth. Each superconductor will have a characteristic penetration depth dependent on the material properties. When a superconductor is cooled in a weak magnetic field, as it crosses below the transition temperature, persistent currents arise on the surface and circulate so as to cancel the flux inside (c.f. a current flowing around a loop generates a perpendicular magnetic field - the superconductor does the same to generate a field which opposed the applied field. These persistent currents only flow in a depth equal to the penetration depth. Duh

[UKunt]

lol that explains it for me. errrrrrrm.what did it say again?

[mattlikespeople]

basically the supercooled metal creates an electric field that is diamagnetic, aka repels north and south poles. simple enough?

[UKunt]

il have mustard and cheese with that please^

[vette12]

we did this in my physics class this semester, but with a cube instead of a disc. it was really weird to see in person. a spinning cube floating in air.