ECE :: Materials and Components
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The relationship of hysteresis loss to maximum flux density was first determined by
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In metals the thermal conductivity K and electrical conductivity σ are related as (K/σT) = L, L is known as
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Assertion (A): If WF is Fermi energy, v is velocity of electron and m is mass of electron, then
.Reason (R): Conductivity of a metal depends on temperature and impurity concentration.
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Assertion (A): When an electron is revolving in its orbit and magnetic field is also present, the angular frequency of electron will be affected by the magnetic field.
Reason (R): In the case of electron revolving in its orbit in the presence of magnetic field, the orbital magnetic dipole moment is not affected by the presence of magnetic field.
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In carbon resistor colour code, the third band is red. It indicates
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Paramagnetic materials have permanent magnetic dipoles but interaction between neighbouring dipoles is negligible.
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Assertion (A): If difference between static and optical dielectric constant is high, the mechanical compressiblity of that material is also high.
Reason (R): For soft ions, ionic polarization per unit field is higher than that of hard ions.
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Assertion (A): In Figure, the intercept of the line on y-axis is equal to N (ae + ai), where N is number of atoms/m3, ae is electronic polarizability and ai is ionic polarizability.
Reason (R): ae and ai are independent of temperature.
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