Two particles (point charge) are on the x-axis as shown below. Particle 1 charge Q1 = +1.0 C and Q2 particles = -3.0 C separated by L= 10 cm. If particle Q3 the charge is unknown Q3 must be placed in such a way that the electrostatic force is zero, then: a. Determine the position (coordinate) of particle 3 in the x, y plane? b. Do a simple scientific analysis of why particle Q3 is in that position (answer a).