ch23-p012 - 12. Eq. 23-6 (Gauss law) gives = qenc . (a)...

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12. Eq. 23-6 (Gauss’ law) gives ε ο Φ = q enc . (a) Thus, the value 52 2.0 10 N m /C Φ= × for small r leads to 12 2 2 5 2 6 6 central 0 (8.85 10 C /N m )(2.0 10 N m /C) 1.77 10 C 1.8 10 C q ε −− = × × = × ≈ × . (b) The next value that Φ takes is 4.0 10 N m /C Φ=− × , which implies 6 enc 3.54 10 C. q =− × But we have already accounted for some of that charge in part (a), so
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