Consists of 2 metal rings connected by an aluminium beam, that can rotate freely on a iron stand Dia.8cm. One of the rings is closed loop; the other is opend for comparision. When a bar magnet moves into or out of the loop the magnetic flux will change. According to Lenz's law, a current will be induced in the loop to oppose the change. Students can verify the law by analyzing the movement of the loop.
