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A point charge of 5.00 μC is placed at the origin and a second point charge...

A point charge of 5.00 μC is placed at the origin and a second point charge of -3.00 μC is placed at x = 0.450 m. Where along the x-axis can a third charge be placed so that the net force on it is zero?

What if both charges are positive?

Please answer the bolded part of the question as well!

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