Answer
10 N.
Work Step by Step
Use Coulomb's Law, $F = k \frac{q_{1} \; q_{2}}{d^{2}}$.
$$F = 9.0 \times 10^{9} \frac{N m^{2}}{C^{2}} \frac{q_{1} \; q_{2}}{d^{2}}$$
$$F = 9.0 \times 10^{9} \frac{N m^{2}}{C^{2}} \frac{(0.000001 C)(0.000001 C)}{(0.03 m)^{2}}$$
$$F = 10 N$$