Assertion (A): Work done by electric field on moving a positive charge on an equipotential surface is always zero.

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Q.
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 given below: [2024]

1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)

2 (A) is correct but (R) is not correct

3 (A) is not correct but (R) is correct

4 Both (A) and (R) are correct and (R) is the correct explanation of (A)

Ans.
(4)

Electric line of force are always perpendicular to equipotential surface so angle between force and displacement will always be $90^{o}$ . So work done is equal to 0.

Solution

1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)

2 (A) is correct but (R) is not correct

3 (A) is not correct but (R) is correct

4 Both (A) and (R) are correct and (R) is the correct explanation of (A)

Ans.
(4)

Electric line of force are always perpendicular to equipotential surface so angle between force and displacement will always be $90^{o}$ . So work done is equal to 0.

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Solution

1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)

2 (A) is correct but (R) is not correct

3 (A) is not correct but (R) is correct

4 Both (A) and (R) are correct and (R) is the correct explanation of (A)

Ans. (4) Electric line of force are always perpendicular to equipotential surface so angle between force and displacement will always be 90o. So work done is equal to 0.

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Ans.
(4)

Electric line of force are always perpendicular to equipotential surface so angle between force and displacement will always be $90^{o}$ . So work done is equal to 0.