ECE :: Materials and Components
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Assertion (A): Rochelle salt and Barium titanate are both ferroelectric.
Reason (R): Ferroelectric materials exhibit hysteresis effect.
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The temperature coefficient of resistivity of semiconductors is
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Which of the following is used in automatic control of street lights?
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A leaky dielectric has ∈r = ∈r' - j∈r". If a field E is applied, the current component in phase with E is proportional to ∈r".
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Assertion (A): In ionic dielectrics, P = Pe + Pi.
Reason (R): In ionic crystals, permanent electric dipole moment is zero.
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The current flow in a semiconductor is due to
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Assertion (A): Relative permittivity is determined by the atomic structure of the material.
Reason (R): Absolute permittivity is determined by the atomic structure of the material.
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Eddy current loss is
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The dipole moment per unit volume P as a function of E for an insulator is
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