Question

Two charges are located on the *x* axis: *q*_{1} = +4.7C at *x*_{1} = +4.2 cm, and *q*_{2} = +4.7C at *x*_{2} = -4.2 cm. Two other charges are located on the *y* axis: *q*_{3} = +3.9C at *y*_{3} = +4.9 cm, and *q*_{4} = -11C at *y*_{4} = +6.2 cm. Find **(a)** the magnitude and **(b)** the direction of the net electric field at the origin.

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