Electric charge and force question

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SUMMARY

The discussion centers on a physics problem involving electric charges, specifically calculating the value of charge q3 given q1 = 25 μC and q2 = 20 μC. The user attempted to find q3 by adding the charges vectorially, resulting in 5 μC, while the correct answer according to the textbook is 20 μC. The force on charge q1 is directed in the negative x-direction, indicating the influence of charge q2 on q1.

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Homework Statement


q1 = 25 μC at (0,1) and q2 = 20 μC find a.) q3 if q1 is in the negative x direction

Homework Equations


E=kq1q2/r^2

The Attempt at a Solution


I keep trying to add vectors to find q3 ie ( -(25 μC) + 20 μC) and get 5 μC the book answer says 20 μC
 
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the force on q1 points in the -x direction
 

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