If you could show work and explain, that\'d be great! Thanks! Two point charges

Question

If you could show work and explain, that'd be great! Thanks! Two point charges are located on the y axis as follows: charge q_1 = -1.00 nC at y_1 =-0.600 m, and charge q_2 = 2.40 nC at the origin (y=0). What is the magnitude of the net force exerted by these two charges on a third charge q_3=7.00 nC located at y_3=0.250 m? What is the direction of the net force? The net force is in + y direction. The net force is in - y direction. The net force is in + x direction The net force is in - x direction

Explanation / Answer

force on q3 due to q1= 9 x 10^9 x 1 x 10^-9 x 7 x 10^-9/0.85^2 = 87.2 x 10^-9 towards - y-sxis

force on q3 due to q2= 9 x 10^9 x 2.4 x 10^-9 x 7 x 10^-9/0.25^2 = 2419.2 x 10^-9 n towards + y-axis

net force = (2419.2 - 87.2 ) x 10^-9 = 2332 x 10^-9 N towards + y-axis

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