Two parallel non conducting rings

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SUMMARY

The discussion centers on calculating the ratio of charge magnitudes q1/q2 for two parallel non-conducting rings with uniform charges q1 and q2, both having radius R and separated by a distance of 3.00R. The electric field magnitudes at point P on the common axis are in a ratio of 2.87, leading to the need for a mathematical approach to derive q1/q2. The relevant equations for electric fields E1 and E2 are provided, but the user expresses confusion regarding the application of these equations to find the desired ratio.

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SOS2012
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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

 
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Welcome to PF!

Hi SOS2012! Welcome to PF! :smile:

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

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


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
 
(where is P, and what is d ? :confused:)

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

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