Explanation Introduction: Equipotential lines are the contour lines which basically trace the lines of equal potential or voltage. These lines are perpendicular to the direction of electric field. When three dimension is considered, the equipotential lines form equipotential surfaces. To move apositive point charge around the negative point charge, then no work is needed. The potential is same along each equipotential line.So, if any change if moving along this line, no work is required. Consider the following figure:

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Solution Summary: The author explains that Equipotential lines are contour lines that trace the lines of equal potential or voltage. They are perpendicular to the direction of electric field.