Assertion :Gaussian surface is considered carefully. Reason: The point where electric field to be calculated should be within the surface.

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 Gaussian surface should preferably be normal to the direction of electric field vector in the region where it is drawn. But electric field is calculated at the Gaussian surface only, not inside it.
Thus, assertion is correct but reason is incorrect.

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