Massachusetts Institute of Technology
Sign in | Create Account

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 5 years by Anonymous

You need to log in, in order to post comments. If you don’t have an account yet, sign up now!

MIT Department of Physics Technical Services Group

MIT Department of Physics Technical Services Group

Category: Science | Updated over 1 year ago

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


Viewed
50508 times

More from MIT Department of Physics Technical Services Group

Bell Labs Wave Machine: Reflection

Bell Labs Wave Machine: Reflection

Added over 3 years ago | 00:01:00 | 15290 views

Exploding Wire

Exploding Wire

Added over 1 year ago | 00:01:14 | 2502 views

Dissectible Capacitor

Dissectible Capacitor

Added over 5 years ago | 00:02:54 | 43441 views

Orbital Motion

Orbital Motion

Added 5 years ago | 00:03:00 | 41758 views

Inducing Dipoles with a Van de Graaff Generator

Inducing Dipoles with a Van de Graa...

Added over 5 years ago | 00:02:51 | 44607 views

Feather and Coin in a Vacuum

Feather and Coin in a Vacuum

Added almost 4 years ago | 00:02:08 | 20472 views