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
50505 times

More from MIT Department of Physics Technical Services Group

MIT Physics Demo -- Centrifugal versus Centripetal Motion

MIT Physics Demo -- Centrifugal ver...

Added 6 years ago | 00:01:18 | 32767 views

Paramagnetism Of Liquid Oxygen

Paramagnetism Of Liquid Oxygen

Added over 2 years ago | 00:02:22 | 8733 views

Coupled Air Carts

Coupled Air Carts

Added over 5 years ago | 00:07:38 | 48415 views

Ripple Tank: Interference of Two Point Sources

Ripple Tank: Interference of Two Po...

Added 5 years ago | 00:01:41 | 46326 views

Refraction & Total Internal Reflection

Refraction & Total Internal Reflection

Added 2 years ago | 00:01:53 | 4467 views

Balloons in Liquid Nitrogen

Balloons in Liquid Nitrogen

Added over 5 years ago | 00:01:18 | 44862 views