Electrostatics

A point charge \(q_1=4q_0\) 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 \(x\) axis so that the electrostatic force on the proton is zero. In this situation, the position of the proton from the origin is ___________ cm.