How Does the Charge Simulation Method Determine Q1, Q2, and Q3?

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The Charge Simulation Method determines the charges Q1, Q2, and Q3 based on their symmetrical arrangement, leading to Q1 being equal to Q3 at 6.97 x 10^-11 C. Q2 is calculated to be 1.44 x 10^-11 C. The user seeks assistance with understanding the method for finding these charges. Additionally, there is a request for guidance on how to upload a picture to the forum. The discussion focuses on the calculation and representation of electric charges in a symmetrical setup.
MissP.25_5
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Hello. This is not homework, so I am posting this here because I feel this is the right place to do so.
How do I find charges Q1, Q2 and Q3? The answers are given as follow:

Q1 = Q3 (This is due to the symmetrical arrangement)
= 6.97 x 10^-11 [C]

Q2 = 1.44 x 10^-11 [C]

I really appreciate if anyone could help me out.

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