Reason (R): Electric field at a point in space is proportional to rate of change of potential with distance.
Solution:
Assertion (A) is true because equipotential surfaces are perpendicular to electric field lines. Reason (R) is true as \(E = -\frac{dV}{dr}\). However, (R) describes the relation, but not why potential is constant along north-south specifically for an eastward field.
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