ECE :: Materials and Components
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The core of a solenoid is made of material of relative permeability μr. A small cavity area dA and length dl is cut in the core. If it is desired that flux density in the cavity should be equal to B0
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A copper specimen has resistivity equal to 1.8 x 10-8 ohm-m at room temperature. At a temperature of 700 K, the resistivity is likely to be
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Assertion (A): Dielectric constant is independent of temperature unless the temperature is extremely high.
Reason (R): For normal temperatures the number of atoms per unit volume is constant.
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As the atoms of rare gases become larger, electronic polarizability
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Ferrimagnetic materials have anti-parallel orientation of equal moments of permanent dipoles.
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Yettrium-iron garnet (Y2Fe5O12) is a soft magnetic material suitable for applications involving
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The mass of proton and electron are
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A rare gas having N atoms/m3 is subjected to an electric field E. The electric dipole moment per unit volume is proportional to N and E.
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In an intrinsic semiconductor, at a given temperature T
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A.
the number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
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B.
the number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
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C.
the number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination
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D.
any of the above
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