Assertion :For good conductors, the $I - V$ graph is a perfectly straight line inclined to current axis. Reason: By Ohm's law, voltage across the ends of a conductor is directly proportional to the resistance of the conductor.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
The $I - V$ characteristics for a good conductor shows a straight line because in a conductor, the voltage is directly proportional to the current in the conductor.

According to the ohm's law, the current flowing through a conductor is directly proportional to the voltage applied across it.
$I \propto V$

Thus, the assertion is correct and the reason is incorrect.

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