Question

Three point charges are arranged on a line. Charge q3 = +5.00 nC and is at the origin. Charge q2 = -2.00 nC and is at x = 3.50 cm . Charge q1 is at x = 1.50 cm . What is q1 (magnitude and sign) if the net force on q3 is zero?

Answer 1

Concept: since the force on the charge is zero, field at origin must be zero, we use this to find the charge as follows, ***************************************************************************************************
Check the answer and let me know immediately if you find something wrong... I will rectify the mistakes asap if any