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In which one of the following cases Ohm’s law is not valid?
Wire bound resistor
Potentiometer
Junction diode
Electric bulb
-Diode do not supports ohm’s law as Ohm's law is not applicable for unilateral networks. The conductors which does not obey ohm's law is called Non – Ohmic Conductors. Semi – conductors like Germanium and silicon do not obey Ohm's law.
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