Two parallel non conducting rings

[SOS2012]

Homework Statement

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?

Homework Equations

The Attempt at a Solution

 

[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!

 

[SOS2012]

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 don't know how i would use them in order to get the ratio of q1/q2

 

[tiny-tim]

(where is P, and what is d ? )

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