A +8.30 μC charge is placed at the origin, as in the figure below. (a) What is the magnitude and direction of the electric field due to the +8.30 μC charge at the point marked P? (b) What is the magnitude and direction of the electric force on a −1.50 μC charge placed at point P due to the +8.30 μC charge? (c) What is the magnitude and direction of the electric field due to the +8.30 μC charge at the point marked R? (d) What is the magnitude and direction of the electric force on a −1.50 μC charge placed at point R due to the +8.30 μC charge?