Assertion :The equation $V = R i$ . does not apply to those conducting devices which do not obey Ohm's law. Reason: $V = R i$ is a statement of Ohm's law.

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

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Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
1. It is 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. The essence of Ohm's law is that the value of R is independent of the value of V.
2. The resistance defining equation R $= \frac{V o l t a g e}{C u r r e n t}$ can be used for finding resistance of all conducting devices, whether they obey Ohm's law or not. If and only if it is constant for arbitrary values of voltage, then the device is said to be Ohmic or Linear.

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Assertion :The equation V=Ri. does not apply to those conducting devices which do not obey Ohm's law. Reason: V=Ri is a statement of Ohm's law.

Assertion :The equation $V = R i$ . does not apply to those conducting devices which do not obey Ohm's law. Reason: $V = R i$ is a statement of Ohm's law.