12. Eq. 23-6 (Gauss’ law) gives εοΦ = qenc. (a) Thus, the value 522.0 10 N m /CΦ=×⋅for small rleads to 12225266central0(8.85 10C /N m )(2.0 10 N m /C)1.77 10 C1.8 10 Cqε−−−=Φ=×⋅×⋅=×≈ ×.(b) The next value that Φtakes is 4.0 10 N m /CΦ=−×⋅, 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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