Assertion :The electrical resistance of any object decreases with increase in its length. Reason: Electrical resistance of any object increases with increase in its area of cross-section.

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 D Both Assertion and Reason are incorrect
Resistance is the opposition that a substance offers to the flow of electric current. It is represented by the uppercase letter R. The standard unit of resistance is the ohm.
The relation between length,area and resistance of a material is given by, $R \propto \frac{l}{A}$
It shows that length is directly proportional to Resistance and area is inversely proportional to resistance of material.
Hence, resistance hence it increases with increase in the length of the object and decreases with increase in its area of cross-section.
So, both assertion and reason are incorrect.

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