# Two parallel non conducting rings

1. May 11, 2012

### SOS2012

1. The problem statement, all variables and given/known data

Figure 22-42 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 a distance 3.00R. The ratio of the electric field magnitudes of Ring 1 and Ring 2 at point P on the common line is 2.87. What is the ratio of charge magnitudes q1/q2?

2. Relevant equations

3. The attempt at a solution

2. May 11, 2012

### tiny-tim

Welcome to PF!

Hi SOS2012! Welcome to PF!

(where is P ? and try using the X2 button just above the Reply box )

Show us what you've tried, and where you're stuck, and then we'll know how to help!

3. May 11, 2012

### SOS2012

Re: Welcome to PF!

E1/E2=2.87

E1=kq1r/(r^2+r^2)^1.5
E2=kq2(2r)/(r^2+(d-r)^2)^1.5

thats the equations i have but i dont know how i would use them in order to get the ratio of q1/q2

4. May 11, 2012

### tiny-tim

(where is P, and what is d ? )

why can't you find q1/q2 just by dividing?​