Question
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Solving time: 2 mins
The relaxation time is nearly independent of applied field whereas it changes significantly with temperature . First fact is (in part) responsible for Ohm's law whereas the second fact leads to variation of with temperature. Elaborate why?
Text solutionVerified
Relaxation time is inversely proportional to the velocities of electrons and ions. The applied electric field produces the insignificant change in velocities of electrons at the order of , whereas the change in temperature , affects velocities at the order of .
This decreases the relaxation time considerably in metals and consequently resistivity of metal or conductor increases as.
This decreases the relaxation time considerably in metals and consequently resistivity of metal or conductor increases as.
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Question Text | The relaxation time is nearly independent of applied field whereas it changes significantly with temperature . First fact is (in part) responsible for Ohm's law whereas the second fact leads to variation of with temperature. Elaborate why? |
Updated On | Mar 5, 2023 |
Topic | Current Electricity |
Subject | Physics |
Class | Class 12 |
Answer Type | Text solution:1 Video solution: 1 |
Upvotes | 275 |
Avg. Video Duration | 6 min |