The example of a non-ohmic conductor is :

Copper wire

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Aluminium wire

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Diode

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Silver wire

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Solution

The correct option is C Diode
An ohmic conductor is the one which obeys ohm's law.
It is a common error to say that $R = \frac{V o l t a g e}{C u r r e n t}$ is a statement of Ohm's law but, If and only if it is constant for arbitrary values of voltage, then the device is said to be Ohmic or Linear.
But, the resistance of a diode varies non linearly with applied voltage.

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