Two identical charged particles each having a mass 10 g and charge $2.0 \times 10^{-7} \mathrm{C}$ area placed on a horizontal table with a separation of L between then such that they stay in limited equilibrium. If the coefficient of friction between each particle and the table is 0.25, find the value of L. [Use $\mathrm{g}=10 \mathrm{~ms}^{-2}$ ]