Fundamentals of Engineering Electromagnetics 1st Edition by David Cheng

Exercise 19

Three point charges Q 1 = 9 ( C ), Q 2 = 4 ( C ) , and Q 3 = 36( C) are arranged on a straight line. The distance between Q 1 and Q 3 is 9 (cm), it is claimed that a location can be selected for Q 2 such that each charge will experience a zero force. Find this location.