4) (20 pts) Three point charges are arranged at the corners of a square as shown below. -3.20 με 1.50 με 1.20 m 1.50 με

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4) (20 pts) Three point charges are arranged at the corners of a square as shown below. -3.20 με 1.50 με 1.20 m 1.50 με a) Find the magnitude and direction of the electric field at the empty corner.
b) Find the magnitude and direction of the electric force on a +9.0 C charge placed at the empty corner.