Eddy Current
Coil is wound over metallic core is helpful in reducing eddy currents in the metallic cores of transformers, electric motors, induction furnaces and other such devices (as shown below).
Eddy currents are undesirable since they heat up the core and dissipate electrical energy in the form of heat. These currents are minimised by using laminations of metal to make a metal core.
When a high frequency alternating current is passed through a coil which surrounds the metal to be melted, then
Options:
(a) the metal freezes
(b) coil rotates with frequency `omega`
(c) the metal melts
(d) None of the above