What are the conditions under which $Ohm's$ law is not obeyed ?
What are the conditions under which $Ohm's$ law is not obeyed ?
Ohm's law. is not obeyed under the following conditions
$(i)$ Potential difference depends upon current non-linearly and
$(ii)$ For the same value of $V ,I$ changes sign with $V.$
$(iii)$ $V$ and $I$ have non-unique relation.
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