ECE :: Materials and Components
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The resistivity of intrinsic semiconductors, at room temperature, is of the order of
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Assertion (A): Ferromagnetic materials possess ferromagnetic properties only when temperature is less than paramagnetic curie temperature.
Reason (R): For a ferromagnetic material
for T > θf. -
In terms of classical representation of electrons
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For a polyatomic gas, the equation relating dielectric constant ∈r with molecular properties is
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The relaxation time of electrons in a metal is of the order of
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Assertion (A): For elemental dielectrics, P = NaeEi where N is number of atoms/m3, P is polarization, ae is electronic polarization and Ei is internal electric field.
Reason (R): In elemental dielectrics there are no permanent dipoles or ions.
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The circumference of an electron orbit is equal to integer times the wavelength of electron.
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In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be
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In a rare gas, the molecules of some atoms have an excess positive or negative charge. The electric field tends to shift positive ions relative to negative ions. This is known as ionic polarization.
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