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90 = 9x10^9 .q1 . q2 / (2x10^-2)²
90 = 9x10^9 .q1 .q2 / 4x10^-4
90 . 4x10^-4 = 9x10^9 .q1 .q2
36x10^-3 =9x10^9 .q1 . q2
4x10^-3 / 10^9 = q1 . q2
4x10^-12 = q1 . q2
q1 = 2x10^-6 ,
q2 = 2x10^-6