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Homework Statement
This is from Prob. 2.25
Two point charges with separation d, P is a point at a distance z above the mid-point of the charges.
The last sentence asked if one of the positive charges is changed to a negative one, what is the potential at P? What field does it suggest? Explain the discrepancy.
Homework Equations
E = -grad V
The Attempt at a Solution
V=0 obviously
E = -grad V = 0
What is the reason behind that gives this result?