Answer: Because electric field lines and equipotential
Chapter 23, Problem Q23.13(choose chapter or problem)
Because electric field lines and equipotential surfaces are always perpendicular, two equipotential surfaces can never cross; if they did, the direction of E S would be ambiguous at the crossing points. Yet two equipotential surfaces appear to cross at the center of Fig. 23.23c. Explain why there is no ambiguity about the direction of E S in this particular case.
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