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(1/(4*pi*8.854187e-12))*(3e-8*(1/0.1-1/0.9)+(-6e-8*(1/0.9-1/0.1)))
(1/(4*pi*8.854187e-12))*(3e-8*(1/0.1-1/0.9)+(-6e-8*(1/0.9-1/0.1)))
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