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Discussion :: Materials and Components

  1. As per Matthiessen's rule, the total resistivity r of a conductor can be written as r = ri + aT, where ri and a are constants and T is absolute temperature. At very low temperatures

    2. A.
    aT = 0
    B.
    aT > ri
    C.
    aT ∼ ri
    D.
    aT < ri

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    Answer : Option D

    Explanation :

    At very low temperatures a T → 0. Since resistivity has a finite value even at low temperature, a T < ri.

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