Conducting and Dielectric Materials
Pp. 155-220 (66)
Sameir M. Ali Hamed
This chapter focuses on the conducting and dielectric materials and their
properties under static fields condition. Conducting materials conduct electric current
efficiently, while dielectrics possess high insulation capabilities, in addition to its ability
to store electric energy. Conducting and dielectric materials are essential in all electrical
and electronics systems and equipment. The ability of the material to conduct the
electric current is called the conductivity of the material. On the other hand, the
interaction between a dielectric material and electrostatic field leads to the formation of
dipole moments in the atoms of the material, which is known as polarization. This
polarization ability of a material is quantitatively described by a constant known as the
permittivity of the material. The permittivity of a dielectric material relative to that of
free space is known as the relative permittivity or dielectric constant of the material.
Both the conductivity and dielectric constant depend on the intrinsic properties of the
material. This chapter presents a detailed derivation for the conductivity and
permittivity under static field conduction. In addition to the properties of the conducting
and dielectric materials, the chapter discusses the concept of conservation of charge and
relaxation time; the boundary conditions between different media; the resistance; the
capacitance; the stored energy in a capacitor. The topics of the chapter are supported by
numerous illustrative examples and figures in addition to solved problems and
homework problems at the end of the chapter.
Capacitance, conduction current, conductivity, conductor, convection
current, dielectric breakdown, dielectric constant, dielectric strength, dielectric,
displacement current, electric flux, mobility, perfect electric conductor,
polarization, relaxation time, resistance, resistivity.
Nile Valley University Atbara, Sudan.