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 6 years by Anonymous

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

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


Viewed
52857 times

More from MIT Department of Physics Technical Services Group

MIT Physics Demo -- Levitating Magnet

MIT Physics Demo -- Levitating Magnet

Added 7 years ago | 00:00:47 | 42164 views

Fluorescent and Neon Tubes in an Electric Field

Fluorescent and Neon Tubes in an El...

Added over 5 years ago | 00:02:02 | 35991 views

Two Dimensional Collisions

Two Dimensional Collisions

Added 6 years ago | 00:01:19 | 46083 views

MIT Physics Demo -- Telegraph Transmitter

MIT Physics Demo -- Telegraph Trans...

Added over 7 years ago | 00:00:36 | 51194 views

Cloud Chamber

Cloud Chamber

Added 6 years ago | 00:02:36 | 85882 views

Bimetallic Strip

Bimetallic Strip

Added 3 years ago | 00:00:47 | 4223 views