18. Eq. 23-6 (Gauss’ law) gives εοΦ = qenc. (a) The value Φ = – 9.0×105 (in SI units) for small rleads to qcentral= – 7.97×10−6 C or roughly – 8.0 µC. (b) The next (non-zero) value that Φtakes is +4.0×105 (in SI units), which implies 6enc3.54 10 C.q−=×But we have already accounted for some of that charge in part (a), so
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