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!

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


Viewed
50441 times

More from MIT Department of Physics Technical Services Group

Laser Diffraction and Interference

Laser Diffraction and Interference

Added over 5 years ago | 00:02:25 | 36264 views

MIT Physics Demo -- Pendulum and Magnet

MIT Physics Demo -- Pendulum and Ma...

Added over 6 years ago | 00:01:11 | 40063 views

Ripple Tank: Interference of Two Point Sources

Ripple Tank: Interference of Two Po...

Added 5 years ago | 00:01:41 | 46277 views

MIT Physics Demo -- Low Friction Atwood Machine

MIT Physics Demo -- Low Friction At...

Added almost 6 years ago | 00:00:46 | 46336 views

MIT Physics Demo -- Dipole Antenna

MIT Physics Demo -- Dipole Antenna

Added 6 years ago | 00:00:57 | 39256 views

Dissectible Capacitor

Dissectible Capacitor

Added over 5 years ago | 00:02:54 | 43372 views