Figure 23-39 shows two parallel nonconducting rings arranged withtheir central axes along a common line. Ring 1 has uniform chargeq1 and radius R; ring 2 has uniformcharge q2 and the same radius R. Therings are separated by a distance 3R. The net electricfield at point P on the common line, at distanceR from ring 1, is zero. What is the ratioq1/q2?

Figure 23-39.