what r eddy currents.tell me in detail.i need it
See, Eddy current are nothing but the induced current in the bulk of the metal. Normally we consider a very small element to show that current are induced in it via changing magnetic fields. But Foucalt discovered that current are also induced in the bulk of a metal such as Aluminium, Copper etc. In this way Eddy current was discovered. It has a wide application in daily life. FOr eg:
1. Laminating of transformer to prevent heating and other loss
2. Induction
3. DIathermy in medical.