Heinrich Lenz (1804-1865) Was Born

Heinrich Friedrich Emil Lenz was a Baltic German physicist most famous for formulating Lenz's law in 1834.
Lenz's law gives the direction of the induced electromotive force (emf) and current resulting from electromagnetic induction. The law provides a physical interpretation of the choice of sign in Faraday's law of induction, indicating that the induced emf and the change in flux have opposite signs.

- Wikipedia

Science Fair Project Information
Title: Research the Force Generated from a Changing Magnetic Field
Subject: Magnetism
Grade level: Middle / High School - Grades (6-12)
Academic Level: Ordinary
Project Type: Experimental
Cost: Low
Awards: None
Affiliation: California State Science Fair (CSSF)
Year: 2005
Description: A NIB magnet was dropped down a metal tube. As the magnet passed through the tube, a changing magnetic field exerted a braking force on the falling magnet to slow it down. Then Newtons' Second Law (F = ma) was used to measure the magnetic braking force by connecting the NIB magnet with a string that was attached to a cart that was pulled up an incline ramp.

Link: http://www.usc.edu/CSSF/History/2005/Projects/J1529.pdf