This book deals with the study of magnetic and electrical properties of Cr doped Ni-Cd ferrites. It gives introduction to ferrites and a review of word done in this field. It discusses the synthesis of the doped ferrites and various characterization technique used. It gives the analysis of the structural, magnetic and electrical properties of the synthesized system of ferrites. Magnetization, susceptibility, resistivity, thermoelectric power and dielectric properties are discussed.