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
Options
A. aT = 0
B. aT > ri
C. aT ? ri
D. aT < ri
Correct Answer
aT < ri
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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