F = kq1q2/r2
Where,
F - Coulomb Force
k - constant value which is equal to 8.98 × 10^9 newton square metre per square coulomb
q1 and q2 - two electric charges
r - distance.
5.8 10^5 = 1.5 10^-9 / r^2
5.8 10^5 r^2 = 1.510^-9
r^2 = 0.0000258620
r = 0.0050854694
So the distance is equal to 5.09 x 10^-3
