Ohm's law fails in

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(D) Ohm's law states that the current flowing through a conductor is directly proportional to the potential difference across its ends,provided physic

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All of these

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(D) Ohm's law states that the current flowing through a conductor is directly proportional to the potential difference across its ends,provided physical conditions remain constant. This results in a linear $I-V$ characteristic.Devices like diodes,thyristors,and $PN$ junction systems are non-ohmic devices. They do not exhibit a linear relationship between current and voltage,and their resistance is not constant. Therefore,Ohm's law is not applicable to these devices.Thus,the correct option is $D$.

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