Is the Ohm's law verified to hold true at all temperatures? If not, then till what temperature does the Ohm's law hold?
I think it is valid only till $0$ K and above. Am I right in my thinking?
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Ohm's law is a statement regarding the relationship between potential difference and current - they are proportional to one another.
What one can do is to decide whether or not for a particular object that relationship between potential difference and current is followed.
Whether or not an object follows Ohm's law makes no difference to the statement which we call Ohm's law.
So there can be no verification of Ohm's law rather one can test whether or not an object obeys Ohm's law.