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应用高斯定理 ∮ E · dS = ∑qi /ε0
E 4 π r^2 = ∑qi /ε0,E = ∑qi / (4 π ε0 r^2)
(1)r = 5 cm 处,小于 6 cm,∑qi = 0,E = 0
(2)r = 8 cm 处,
∑qi = 2*10^-5 * 4/3 * π (0.08^3 - 0.06^3) = 2.47976*10^-8 C,
E = 34840 V/m
(3)r = 12 cm 处,
∑qi = 2*10^-5 * 4/3 * π (0.10^3 - 0.06^3) = 6.56802*10^-8 C,
E = 41013 V/m
E 4 π r^2 = ∑qi /ε0,E = ∑qi / (4 π ε0 r^2)
(1)r = 5 cm 处,小于 6 cm,∑qi = 0,E = 0
(2)r = 8 cm 处,
∑qi = 2*10^-5 * 4/3 * π (0.08^3 - 0.06^3) = 2.47976*10^-8 C,
E = 34840 V/m
(3)r = 12 cm 处,
∑qi = 2*10^-5 * 4/3 * π (0.10^3 - 0.06^3) = 6.56802*10^-8 C,
E = 41013 V/m
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