Massachusetts Institute of Technology
Sign in

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 8 years by Anonymous

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

Posted 6 years by yassine

You need to log in, in order to post comments.

MIT Department of Physics Technical Services Group

MIT Department of Physics Technical Services Group

Category: Science | Updated over 6 years ago

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


Viewed
53749 times

More from MIT Department of Physics Technical Services Group

Breaking Glass with Sound

Breaking Glass with Sound

Added over 7 years ago | 00:02:33 | 66911 views

Ripple Tank: Single and Double Slit Diffraction and Interference

Ripple Tank: Single and Double Slit...

Added over 7 years ago | 00:03:05 | 62827 views

Two Dimensional Collisions

Two Dimensional Collisions

Added over 7 years ago | 00:01:19 | 48710 views

Cloud Chamber

Cloud Chamber

Added over 7 years ago | 00:02:36 | 92733 views

Adjustable Capacitor with Dielectric

Adjustable Capacitor with Dielectric

Added almost 8 years ago | 00:02:05 | 39401 views

Inducing Dipoles with a Van de Graaff Generator

Inducing Dipoles with a Van de Graa...

Added 8 years ago | 00:02:51 | 52632 views