Materials and Components
As regards ∈0 and ∈r (absolute and relative permittivity)
Answer: B
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Assertion (A): The resistance of a copper specimen changes by about 22% when temperature is increased from room temperature to 700°C.
Reason (R): The physical properties of a material are determined mostly by the extent of impurities.
Answer: B
The increase of resistance with temperature is governed by temperature coefficient of resistance.
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For a polyatomic gas, the equation relating dielectric constant ∈r with molecular properties is
Answer: A
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When an electric field E is applied to solid and liquid insulating materials, the internal field Ei acting at the location of atom is such that
Answer: B
The actual field seen by an atom is larger than applied field.
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Dielectric constant of transformer oil is about
Answer: B
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There is no hysteresis phenomenon is any dielectric material.
Answer: B
Hysteresis phenomenon exists in dielectic materials.
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If ∈r' and ∈r" are the real and imaginary parts of complex dielectric constant ∈r, and δ is the loss angle. Then
Answer: B
If ∈r" = 0, δ = 0.
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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.
Answer: A
The intercept on y-axis equals N (ae + ai).
This intercept is constant because ae and ai are independent of temperature.
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Which of the following is the poorest conductor of electricity?
Answer: B
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At room temperature, the current in intrinsic semiconductor is due to
Answer: D
Both electrons and holes contribute to flow of current in semiconductors.
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