(Solved): Three point charges are placed at the corners of a equilateral triangle as shown in the figure abo ...

Three point charges are placed at the corners of a equilateral triangle as shown in the figure above. \( A=-4 \mu \mathrm{C}, B=-5 \mu \mathrm{C} \). \( C=7 \mu \mathrm{C} \) and \( d=6 \mathrm{~cm} \). a) Find the field stregth due to charges \( B \) and \( C \) at the origin: b) What is the force on charge \( A \) ? \( \mathrm{i}+\mathrm{jN} \) c) If the sign of the charge at the origin is changed, what will be the field strength? \( \mathbf{i}+\mathbf{j N} / \mathrm{C} \)