ECE :: Materials and Components
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The fact that domains exhibits spontaneous magnetisation is
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Assertion (A): Hall effect is used to determine whether the semi- conductor is p or n type.
Reason (R): Under the influence of field, holes and electrons move in opposite direction.
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The most important set of specifications of transformer oil include
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With increase in temperature, the electrical conductivity would
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The resistance of a metallic wire would
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If a small amount of Cu is added to Ni conductor, then
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When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.
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A.
resistivity of Ni will decrease at all temperatures because Cu is a better conductor than Ni
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B.
residual resistivity of Ni at low temperature will increase as Cu atoms act as defect centres
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C.
resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects
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D.
resistivity of Ni remains the same
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