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- Homework Statement
- Three equal positive charges, q = 8.5 μC each, are arranged at the vertices of equilateral triangle (see figure below). A negative charge, Q, is placed at the center of the triangle such that all four charges are in equilibrium.

- Relevant Equations
- Ef=0

f=kq1q2/r^2

hello i would like to understand something, i found the right answer but there is still something i don't understand.

here is the figure

and here is my correct solution

what i don't understand is why F(3,Q) is 3kQ/r^2

i mean why is the 3? i only calculat the force between q3 and Q so why the 3 before?

here is the figure

and here is my correct solution

what i don't understand is why F(3,Q) is 3kQ/r^2

i mean why is the 3? i only calculat the force between q3 and Q so why the 3 before?

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