ECE :: Materials and Components
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Assertion (A): Dielectric losses are proportional to tan δ.
Reason (R): tan δ =
where ∈r' and ∈r" denote the real and imaginary parts of ∈r. -
In a polyatomic gas, the types of polarization which exist together are
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Assertion (A): Metals are better heat conductors than insulators.
Reason (R): If
is temperature gradient, Q is heat flow density and K is thermal conductivity, then Q = - K (dT/dx). -
Electric dipole moment is usually expressed in debye units. Here, 1 debye unit equals
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A particle of charge Q coulombs is bound elastically to an equilibrium position with a force constant of f newton per metre. The polarizability of the system is
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An electron (charge -e) is rotating in a circular orbit of radius R, around a proton with charge +e at a constant angular velocity ω. The orbital magnetic dipole moment is
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In a virgin specimen of iron, the direction of spontaneous magnetisation varies from domain to domain.
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Which of the following is used in lightning arresters?
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