Fundamentals of Engineering Electromagnetics 1st Edition by David Cheng

Exercise 1

Two point charges, Q 1 and Q 2 , are located at (0, 5, 1) and (0, 2, 6), respectively. Find the relation between Q 1 and Q 2 such that the total force on a test charge at the point P(0, 2, 3) will have
a) no y -component, and
b) no z -component.