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 almost 6 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!

MIT Department of Physics Technical Services Group

MIT Department of Physics Technical Services Group

Category: Science | Updated over 1 year ago

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


Viewed
47850 times

More from MIT Department of Physics Technical Services Group

Adjustable Capacitor with Dielectric

Adjustable Capacitor with Dielectric

Added over 5 years ago | 00:02:05 | 35173 views

Bell Labs Wave Machine: Matched Impedance

Bell Labs Wave Machine: Matched Imp...

Added over 3 years ago | 00:01:13 | 11635 views

MIT Physics Demo -- Forces on a Current-Carrying Wire

MIT Physics Demo -- Forces on a Cur...

Added over 6 years ago | 00:00:49 | 38350 views

Ring Falling in a Magnetic Field

Ring Falling in a Magnetic Field

Added 3 years ago | 00:03:27 | 10103 views

MIT Physics Demo -- Microwave Polarization

MIT Physics Demo -- Microwave Polar...

Added over 6 years ago | 00:01:14 | 34588 views

Wooden Block Between Two Strings

Wooden Block Between Two Strings

Added almost 4 years ago | 00:01:54 | 15696 views