\(F\,\, = \,\,\frac{{k{Q^2}}}{{{r^2}}}\,\, = \,\,\frac{{9\,\, \times \,\,{{10}^9}\,(100\,\, \times \,{{10}^{ - 6}})\,\, \times \,\,(100\,\, \times \,\,{{10}^{ - 6}})}}{{{{(10\,\, \times \,\,{{10}^{ - 2}})}^2}}}\,\,\, = \,\,9\,\, \times \,\,{10^3}\,\,N\,\)