Chapter 22, Problem 23P

Figure 22-47 shows two parallel nonconducting rings with their central axes along a common line. Ring 1 has uniform charge q₁ and radius R; ring 2 has uniform charge q₂ and the same radius R. The rings are separated by distance d = 3.00R.The net electric field at point P on the common line, at distance R from ring 1, is zero. What is the ratio q₁/q₂?

Figure 22-47 Problem 23.