How do I find the other charge using electric potential?

AI Thread Summary
To find the other charge using electric potential, the relevant equation is not k|q1||q2|/r^2, but rather the expression for electric potential due to point charges. The potential at a point is the sum of the potentials from each charge, which should be set equal to the given potential of 7.68 V. The calculation must begin with the correct formula for electric potential, which involves the individual charges and their distances from the point of interest. It’s essential to show detailed calculations to identify any errors in the approach. Correctly applying the principles of electric potential will lead to the solution for the unknown charge.
moeug1999
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Homework Statement
The potential equals 7.68 V at the midpoint between two point charges that are 1.11 m apart. One of the charges is 1.06 10-9 C. Find the value of the other charge.
Relevant Equations
I assume the k|q1||q2|/r^2
I tried looking for the other charge using the equation k|q1||q2|/r^2 but it tells me that my answer is wrong
 
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moeug1999 said:
Homework Statement:: The potential equals 7.68 V at the midpoint between two point charges that are 1.11 m apart. One of the charges is 1.06 10-9 C. Find the value of the other charge.
Relevant Equations:: I assume the k|q1||q2|/r^2

I tried looking for the other charge using the equation k|q1||q2|/r^2 but it tells me that my answer is wrong
Please show us your detailed calculation so we can check it for you. Thanks. :smile:
 
berkeman said:
Please show us your detailed calculation so we can check it for you. Thanks. :smile:
here's my attempt
 

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moeug1999 said:
Relevant Equations:: I assume the k|q1||q2|/r^2
What you have there is irrelevant to this problem. Not only that but it's not even an equation. Your attempt in post #3 shows a bunch of numbers without a starting equation. This problem is about the electric potential due to point charges. What is a general expression for that? That should be your starting point.
 
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