Particle 1 with charge q1, and particle 2, with a charge q2, are on the x axis, with particle 1 at x = a with and particle 2 at x = −2a. For the net force on a third charged particle, at the origin to be zero q1 and q2 must be related by q2=: 2q1 4q1 −2q1 −4q1 −q1/4