Three point charges are placed at the corners of an equilateral triangle as shown below. (a) Find the electric field strength due to the charges -2 µC and +4 µC at the origin. (b) What is the force on the -3 µC charge? (c) If the sign of the charge at the origin is changed, how is the field strength calculated in part (a) affected? 4.

Three point charges are placed at the corners of an equilateral triangle as shown below. (a) Find the electric field strength due to the charges -2 µC and +4 µC at the origin. (b) What is the force on the -3 µC charge? (c) If the sign of the charge at the origin is changed, how is the field strength calculated in part (a) affected? 4.