Eddy Currents in Conductors Introduction

Eddy current effects in conductors were recognized at an early time. At the end of the nineteenth century, it was known that a conductor of a (telegraphic) coaxial cable has an increased AC resistance for higher frequencies and that the inductance reduces with frequency [1]. The method that was applied used mathematical series and the derivative of the current. This approach is different from the methods we use now, but the result was correct.