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in order to be able to study the neural basis of perceptual and cognitive functions it is necessary to have some knowledge of brain anatomy i.e. what
in physics the dielectric material such as rochelle salt and barium titan ate with a domain structure containing dipoles a symmetric distributions of
1the first practical application for piezoelectric devices was sonar first developed during worldwar1. piezoelectric materials are as a
the world is derived from the greek world which means to squeeze or press. it is usually described as the generation of electricity as a result of
mica is an inorganic mineral. it is one of the best natural insulating materials available. in spite of the tremendous progress made in insulation
ordinary glass is a good insulator but is too brittle to be used for anything but scientific instrument part s accumulator container and for certain
plastics are polymers meaning they are made up of molecules from many different elements. by utilizing different combinations new polymers are made
ceramics are materials made by higher temperature firing treatment of natural clay and certain inorganic matters. structurally ceramics are crystal
there are thousands of insulating materials available in the market. insulations technology is one of the few branches where the number of materials
one of the functions of the insulation is hest transfer. consider an underground cable under operation. this cable is recommended for operations.
volume resistance the resistance provided to the current which flows through the material is called volume resistance. for a cube of unit dimensions
this is the virtue of a material resists flow of electric current. it should be as high as possible. when material is subjected to an electrical
it is defined as the dielectric loss expressed as the tangent of the angle between the reactance and the impedance vectors of the capacitor it is
electrical properties of dielectric materiala loss of energy which eventually produces a rise in temperature of a dielectric placed in an alternating
electrical properties of dielectric materialsthe term dielectric strength of a dielectric material means the maximum electric field strength that it
electrons have very much smaller mass than that of ions so they respond more rapidly to a changing electric field. for electric field that oscillates
in the presence of electronic ionic and dipolar polarization mechanisms the average induced dipole moment per molecule will be the sum of all
interfacial polarization takes place whenever there is an storage of charge at an interface between two materials or between two regions in a
in the case of orientation polarization we have material with built in dipoles that are independent of each other i.e. they can rotate liberally in
the contribution of ionic polarization takes account of the fact that when in a molecule some of the atoms have an excess positive or negative charge
it is defined as an electric strain produced in an atom due to application of external electric field to the bulk material. it is the result of the
an atom is said to be polarized if it possesses and effective dipole moment that is if there is a separation between the centres of negative and
an electrical dipole is just a separation between a negative and positive charge of the same magnitude. consider that a dielectric material is
consider that two large parallel plates forming a capacitor are separated by a distance d with vacuumed as the dielectric medium between the plates.
a metal forms 2 oxides. the higher oxide has 80 metal. 0.72g of lower oxide gave 0.8g of higher oxide when oxidised. show that law of multiple