Lenz's+Law

Heinrich Lenz: 1804-1865

Lenz’s Law: direction of a magnetically induced current is such as to oppose the cause of the current. › Explains how electromagnetic circuits obey the law of conservation of energy.

When a magnet is dropped down a metal tube the falling magnet produces a induced current. This current moves in a circular motion around the tube which creates its own vertical electric field inside the tube. This can result in one of two effects: 1) Attract the magnet causing it to fall faster and creating a greater induced current 2) Repel the magnet and oppose the motion causing it to fall faster

Induction: movement of charge caused by an external charged object; no contact.



The left side of this ammeter becomes north because a opposing force is created by the bar magnet, repeling the bar magnet. The induced magnetic field is to the left.

To see a demonstration of Lenz's Law click [|here]

For further information: []