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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 (resulting from the ionic character of the bonds),an electric field tend to shift positive ions relative to negative ones. This leads to an induced moment of other origin from the moment induced by electron clouds shifting relative to nuclei. In this case a solid material should have some ionic character. It then automatically has internal dipoles, exactly cancels each other and is unable to rotate. The external field them induces net dipoles by slightly displacing the ions from their rest position. The paradigmatic materials are simple ionic crystal like NaCl. The polarization of a given volume, though, is exactly zero as for every dipole moment there is a neighbouring one with exactly the same magnitude, but with opposite sign. Note that the dipoles cannot dipoles, their direction is permanent. In electric field, the ions feel forces in opposite directions. The Na+ ions moved a bit to the right, the Chlorine ions to the lift. The dipoles moments between adjacent NaCl pairs in field direction are now different and there is a net dipole moment in a finite volume now. It can be observed that it is enough to take one dipole in field direction.
Nuclear medicine imagining devices : Imagining ,or producing pictures of the distribution of the radioactivity is the most important aspect of nuclear medicine. Rectilinear s
What is a calorie? a) Amount of heat needed to raise one gram of water one degree Celsius. b) Amount of work needed to move one gram of water by one centimeter. c) Amo
The temp gradient is similar to finding the slope of a line (when in two dimensions) Temp. Gradient= Change in Temp. value/Distance. dT/dx = (T2 - T1)/(X2 - X1)
A 10 V ZENER DIODE ALONG WITH A SERIES RESISTOR IS CONNECTED ACROSS A 40 V SUPPLY.CALCULATE THE MINIMUM VALUE OF THE RESISTOR REQUIRED,IF THE MAXIMUM ZENER CURRENT IS 50 mA?
The turning movement of a particle about the axis of rotation is called the angular momentum of the particle and is measured as the product of the linear momentum and the perpendic
An object is placed at a distance of 0.12m from a convex lens forms an image at a distance of 0.18m. Determine the magnification produced.
Derive the relation between the magnitude of electric displacement and displacement current.
(i) On the average, particles are separated by a distance of the order of 10-10 m and exert a force of attraction of the order of 10-11 N on each other. (ii) The force of atta
"It is explaining that at similar temperature and pressure equivalent volumes of all gases contain similar number of molecules".
what is power of lens?
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