Assertion :Gauss theorem can be applied only for a closed surface. Reason: Electric flux can be obtained passing from an open surface also.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Gauss' law is only applied for the closed surfaces, as over the closed surface, the surface integral of the induced electric field which is electric flux due to induced electric field, is zero. induced electric field is the electric field due to the moving charges.

Though flux can be calculated for open surfaces also.
Thus, both assertion and reason are true but reason is not the correct explanation of the assertion.

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