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