A point charge q_1=4 q_0 is placed at origin. Another point charge q_2=-q_0 is placed at x=12 cm. Charge of proton is q_0. The proton is placed on x…

A point charge $\displaystyle q_1=4 q_0$ is placed at origin. Another point charge $\displaystyle q_2=-q_0$ is placed at $\displaystyle x=12 \mathrm{~cm}$. Charge of proton is $\displaystyle q_0$. The proton is placed on $\displaystyle x$ axis so that the electrostatic force on the proton is zero. In this situation, the position of the proton from the origin is $\displaystyle \_\_\_\_$ cm .