Assertion :An electrostatic field line never forms a closed loop. Reason: Electrostatic field is a conservative field.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
If electrostatic field lines formed closed loops, then work done in taking a charge along this loop will be non zero which contradicts the fact that electrostatic force is conservative. Therefore electrostatic field lines can never be closed. Thus, both assertion and reason are correct and reason is the correct explanation of assertion.

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