Eddy currents as used in electromagnetic induction and their causes
Eddy currents-They are composed of loops of current which have a magnetic effect opposing the force producing them. When a copper plate with slits isused the loops are cut off and hence the effective currents are drastically reduced and so is the opposing force.-Practically eddy currents are reduced by laminating metal plates. Armatures of electric generators and motors are wound on laminated soft ironcores. The lamination slices, which are quite thin are glued together by a non-conducting glue and this reduces eddy currents to an almostnegligible value. Eddy currents are useful in moving coil meters to damp the oscillations of the armature when the current is switched off.