Question

There is a point charge Q1 at x= 0 and a charge Q2 at x=d. What is the relationship between these charges if the resulting electric field is zero at the following points: a) x= d/2 b) x= 2d c) x= -d/2?

Answer 1

$E_i=\frac{kq_i}{r_i^2},$

a)

$\frac{q_2}{q_1}=1,$

b)

$\frac{q_2}{q_1}=-0.25,$

c)

$\frac{q_2}{q_1}=-9.$