Electric Potential-finding unknown charge

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Homework Help Overview

The problem involves calculating the unknown charge based on the electric potential at a midpoint between two point charges. The context is centered around electric potential and charge interactions.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply the formula for electric potential but questions the validity of their result after receiving feedback. Some participants inquire about the correctness of the original poster's answer and suggest verifying it with a teacher.

Discussion Status

The discussion is ongoing, with participants exploring the calculations and questioning the accuracy of the results. There is no explicit consensus on the correctness of the answer, but guidance has been offered regarding seeking further clarification from a teacher.

Contextual Notes

The original poster mentions that their answer was marked incorrect in an online submission system, indicating potential constraints related to the evaluation process.

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Homework Statement



The potential equals 7.52 V at the midpoint between two point charges that are 0.91 m apart. One of the charges is 1.11 x 10-9 C. Find the value of the other charge.

Homework Equations



V = k [sum] (q/r)

The Attempt at a Solution



7.52=k[(1.11 x 10-9 / 0.455m ) + ( x / 0.455m )]

This gives me -7.3x10^-10, which is incorrect, but I cannot think of any other way to approach this problem.
 
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Your approach is correct and the numbers match the approach. How do you know it is incorrect? Do you know the correct answer?
 
I am entering the answers in Webassign and it marked my answer as incorrect. I think there must be a mistake because no one I've showed it to has gotten a different answer.
 
It is time to ask your teacher. You might do everybody a favor.
 

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