Dear student,
When we draw in the electric field lines (lines of force) and the equipotential lines on the same picture we find that the equipotential lines will always cross the field lines at right angles to each other.
It is important to note that electric field lines have a defined direction, the direction of the force on a positive test charge. The equipotential lines have no direction at all.
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All the best.
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Sagar Singh
B.Tech, IIT Delhi