Charges in Right Triangle

Electricity and Magnetism Level 3

Three equal charges are placed in such a way that they form a right triangle with sides $3\text{ cm}, 4\text{ cm}, 5\text{ cm}.$ Each charge has a magnitude of $2\times 10^{-6}\text{C}$ .

Find the net force acting on the charge at the right angle.

Details and assumptions:

Take $\dfrac 1{4\pi\epsilon_0} = 9\times 10^9\text{ Nm}^2/\text{C}^2$ .
Round your answer to the nearest integer.