k =ko/epsr = ~ 9*10^9/epsr
F31 = k*q1 *q3 / (4*10^-4)
F32 = k*|q2|*q3/(16*10^-4)
F = F31 + F32 = kq3(q1/(4*10^-4) + |q2|/(16*10^-4)) = ~9*10^9/epsr*7.5*10^-9(10^-9/(4*10^-4) + 6*10^-9/(16*10^-4)) =7.4*10^-5
epsr = x≈5.70101
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