Question: Because electric field lines and equipotential surfaces are always perpendicular, two equipotential surfaces can never cross; if they did, the direction of EÌ(vector) would be

Because electric field lines and equipotential surfaces are always perpendicular, two equipotential surfaces can never cross; if they did, the direction of EÌ…(vector) 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 EÌ…(vector) in this particular case.

Fig.23.23c

V = +30 V V = +50 V V = +70 V

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