ECE :: Materials and Components
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When the atom of rare gas is placed in an electric field the nucleus shifts from the centre of electron cloud by an amount x. If the radius of electron cloud is R, then
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Macroscopic quantities of a given material
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The relative permeability of a ferromagnetic material is
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If v is velocity of electron, ε0 is absolute permittivity, m is mass of electron, e is charge on electron and r is the radius of orbit of electron in hydrogen atom, the stability of orbit requires the following equation to be satisfied
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Assertion (A): The equation D = ∈0∈rE is applicable only to isotropic materials.
Reason (R): In polycrystalline materials, the directional effects are absent.
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Assertion (A): For a dielectric, P = ∈0(∈r - 1) E.
Reason (R): Dipole moment per unit volume is called polarization of dielectric.
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Assertion (A): Ferrites are very useful at very high frequencies.
Reason (R): Ferrites have high permeability and high resistivity.
0.5 R 
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and coulomb force is equal to 
.