Lenz Law

Arco Lenz Law apparatus is a simple and effective way to demonstrate induction & Lenz Law of electrodynamics. The metal hoops (one open and one closed) are freely moving on a centrally mounted pin. In the product photo above, you have a complete closed circuit (loop) on the right. When a magnetic field is introduced (from a bar magnet being moved toward the closed loop), we have an electrical current and a magnetic field that will repel against the original magnetic field. This is demonstrated when the closed loop moves away from an approaching bar magnet. This is Lenz law. Alternately, when you approach the open circuit (open loop) on the left with a bar magnet, nothing will happen.