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.
More questions
1. If an amplifier with gain of - 1000 and feedback factor ? = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be