The dielectric characteristics of a material are determined by the dielectric constant or relative permittivity of the material. It is defined as the ratio of the permittivity of the medium to the permittivity of the free...
Category - Physics
Uses of dielectric in capacitor The dielectric materials used in capacitors may be in vacuum or gaseous form, liquid form, solid – liquid mixed or solid form. Examples Gaseous dielectrics – Air, Hydrogen, Nitrogen...
Frequency dependence On application of an AC field across the material, the polarizations are produced as function of time i.e., where Pm is the maximum polarization attained due to applied field and tr is the relaxation...
Ferroelectricity is a physical property of a material that exhibits a spontaneous electric polarization or permanent electric dipolemoment even in the absence of electric field and which can be reversed by the application of an...
When a dielectric material loses its insulating property and permits the flow of a large current. This is known a dielectric breakdown. The dielectric strength is the value at which the dielectric breakdown occurs. Dielectric...
The understanding of superconductivity was advanced in 1957 by three American physicists-John Bardeen, Leon Cooper, and John Schrieffer, through their Theories of Superconductivity, know as the BCS theory. The BCS Theory deals...
SQUID stands for Superconducting Quantum Interference Devices. It is a double junction quantum interferometer formed from two Josephson junctions mounted on a superconducting ring. SQUID is based on the flux quantization in a...
It was thought that the electrical resistance of a conductor becomes zero only at absolute zero temperature. But in 1911, H. Kammerlingh Onnes, studied that the properties of mercury at very low temperature using liquid helium...
Fig 1.1 Magnetic recording materials involves the storage of data using a magnetic medium. The data is in the form of analog or digital format. Audiocassette tape recorders are widely used to record and play back music or speech...
In Hysteresis, after a cycle of magnetization, there is some expenditure (loss) of energy. This loss of energy is radiated in the form of heat energy in the material and it is directly proportional to the area of the loop. From...
