Massachusetts Institute of Technology
Sign in | Create Account

Physics Demo -- Lenz's Law

Two bar magnets of the same size are dropped through an aluminum tube and a glass tube. The magnet dropped in the glass tube falls at the normal rate of acceleration due to gravity, but the magnet falling through the metal tube is slowed.

This slowed acceleration occurs because the falling magnet induces currents inside the metal tube. The induced currents then produce a small magnetic field that opposes the direction of the original magnetic field. This effect is known as Lenz's Law, a result of Faraday's law of induction.

Comments (2)

Great demo, the reverse effect found in a rail gun using lenz’ law too!

Posted over 5 years by Anonymous

i never heard about lenz’s law but with this video i will be motivated to research more about

Posted almost 4 years by yassine

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

Created
April 02, 2008 11:52
Category
Tags
License
Creative Commons Attribution-NonCommercial (What is this?)
Additional Files


Viewed
47632 times

More from MIT Department of Physics Technical Services Group

Cloud Chamber

Cloud Chamber

Added 5 years ago | 00:02:36 | 82435 views

A Heat Gun

A Heat Gun

Added over 1 year ago | 00:01:17 | 2229 views

Bell Labs Wave Machine: Mismatched Impedance

Bell Labs Wave Machine: Mismatched ...

Added over 3 years ago | 00:01:24 | 11931 views

MIT Physics Demo -- Back "emf" in a Large Solenoid

MIT Physics Demo -- Back "emf" in a...

Added over 6 years ago | 00:00:23 | 62858 views

MIT Physics Demo -- Levitating Magnet

MIT Physics Demo -- Levitating Magnet

Added 6 years ago | 00:00:47 | 40335 views

Temperature Effect on Resistance

Temperature Effect on Resistance

Added over 5 years ago | 00:01:10 | 41926 views