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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Work done by electric field on moving a positive charge on an equipotential surface is always zero. Reason (R) : Electric lines of forces are always perpendicular to equipotential surfaces. In the light of the above statements, choose the most appropriate answer from the options given below.

1. (A) is correct but (R) not correct
2. (A) is not correct but (R) is correct
3. Both (A) and (R) are true and (R) is the correct explanation of (A)
4. Both (A) and (R) are true and (R) is not the correct explanation of (A)

Correct answer: Both (A) and (R) are true and (R) is the correct explanation of (A)

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