There is a 4.00 nC charge at the origin. A 9.00 nC charge is on the x-axis at x=2.00m. A 5.00 nC charge is on the y-axis at y=1.00m. What is the total force on the 4.00 nC charge at the origin? Give your answer as a magnitude and an angle counterclockwise from the positive x-axis.

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