65. We treat the system as a superposition of a disk of surface charge density σand radius Rand a smaller, oppositely charged, disk of surface charge density –and radius r. For each of these, Eq 24-37 applies (for z> 0) VzRzzrz=+−+−+−ε2200ejej.This expression does vanish as r→∞, as the problem requires. Substituting
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