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 almost 9 years by Anonymous

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

Posted almost 7 years by yassine

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

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


Viewed
55020 times

More from MIT Department of Physics Technical Services Group

Balloons in Liquid Nitrogen

Balloons in Liquid Nitrogen

Added over 8 years ago | 00:01:18 | 51051 views

Inducing Dipoles with a Van de Graaff Generator

Inducing Dipoles with a Van de Graa...

Added over 8 years ago | 00:02:51 | 54092 views

Potential Energy to Kinetic Energy

Potential Energy to Kinetic Energy

Added almost 9 years ago | 00:01:11 | 35201 views

MIT Physics Demo -- Conducting Glass

MIT Physics Demo -- Conducting Glass

Added over 9 years ago | 00:01:11 | 57068 views

Physics Demo -- Magnetic Motor

Physics Demo -- Magnetic Motor

Added over 9 years ago | 00:01:29 | 79751 views

Confetti and the Van de Graaff Generator

Confetti and the Van de Graaff Gene...

Added over 8 years ago | 00:00:55 | 47102 views