Three point charges of magnitude $5 \mu \mathrm{C}, 0.16 \mu \mathrm{C}$ and $0.3 \mu \mathrm{C}$ are located at the vertices $A, B, C$ of a right angled triangle whose sides are $A B=3 \mathrm{~cm}, B C=3 \sqrt{2} \mathrm{~cm}$ and $C A=3 \mathrm{~cm}$ and point $A$ is the right angle corner. Charge at point $\mathrm{A}$ experiences ____________ $\mathrm{N}$ of electrostatic force due to the other two charges.