ECE :: Materials and Components
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When a ferromagnetic substance is magnetised there are small changes in dimensions. This phenomenon is called
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Assertion (A): In some materials, ∈r is independent of temperature while in others, ∈r depends on temperature.
Reason (R): If permanent dipoles are absent, ∈r varies with temperature.
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An electron in a homogeneous magnetic field and having velocity perpendicular to the direction of field moves
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For a given value (n) of principle quantum number, the number of possible electronic states are
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Electrical conductivity of metals expressed in ohm-1 m-1 is of the order of
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In a metal the probability of a state 0.1 eV below Fermi level being occupied
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An homogeneous dielectric material is subjected to an electric field E. If a small cavity is made inside the material, the electric field intensity inside and outside the cavity are different.
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A dielectric is subjected to alternating field. The dielectric losses are potential to
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(2l + 1) = 1 + 3 + .... + [2(n-1) + 1] = n2.|
A.
is more than the probability of state 0.1 eV above Fermi level being occupied
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B.
is the same as the probability of state 0.1 eV above Fermi level being occupied
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C.
is less than the probability of state 0.1 eV above Fermi level being occupied
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D.
may be equal to or more or less than the probability of state 0.1 eV above Fermi level being occupied
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