Calculating Electric Field & Force: Q1 & Q2

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laxwarrior
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Electric Field Help Please!

Two charges are separated by 1.0 m. Q1 has a negative charge of 4.2 µC and Q2 has a positive charge of 1.4 µC. At what position is the net electric field that is produced by both Q1 and Q2 equal to zero?

2nd part: If a +5.0 µC charge is placed at this position, what force would act on it as a result of Q1 and Q2?
 
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