Massachusetts Institute of Technology
Sign in

Physics Demo -- Superconductor

A bismuth-based superconducting disk sits on a copper base and is immersed in liquid nitrogen. Two small, very strong magnets are placed on top of the superconductor. The magnets levitate due to the expelled magnetic field from the superconductor.

Superconductors have the unique property of providing zero resistance for electrical currents when cooled to low enough temperatures. Thus, a current induced in a superconductor will last for an extraordinarily long time. This property also leads to the fact that superconductors will expel all magnetic fields, a phenomenon called the Meissner Effect. As a result of this effect, a magnet approaching a superconductor will "see" an opposite magnet of the same size and field strength as itself, which causes it to levitate.

Comments (1)

what are superconductors made from and haw?

Posted over 8 years by Anonymous

You need to log in, in order to post comments.

MIT Department of Physics Technical Services Group

MIT Department of Physics Technical Services Group

Category: Science | Updated almost 7 years ago

Created
March 28, 2008 12:25
Category
Tags
License
All Rights Reserved (What is this?)
Additional Files


Viewed
58207 times

More from MIT Department of Physics Technical Services Group

Ripple Tank: Single and Double Slit Diffraction and Interference

Ripple Tank: Single and Double Slit...

Added 8 years ago | 00:03:05 | 63960 views

MIT Physics Demo -- Galvanometer Principle

MIT Physics Demo -- Galvanometer Pr...

Added 9 years ago | 00:00:47 | 54096 views

MIT Physics Demo -- Jumping Wire

MIT Physics Demo -- Jumping Wire

Added 9 years ago | 00:00:37 | 41030 views

Physics Demo -- Lenz's Law

Physics Demo -- Lenz's Law

Added over 9 years ago | 00:00:28 | 54837 views

MIT Physics Demo -- Dipole Antenna

MIT Physics Demo -- Dipole Antenna

Added 9 years ago | 00:00:57 | 45150 views

MIT Physics Demo -- Exploding Wire

MIT Physics Demo -- Exploding Wire

Added 9 years ago | 00:02:00 | 66968 views