25. Three positive charges A, B, and C, and a negative charge D are placed in a line as shown in the diagram. All four charges are of equal magnitude. The distances between A and B, B and C, and C and D are equal. (ref: p.553-561) + A + B + C - D a. Which charge experiences the greatest net force? Which charge experiences the smallest net force? b. Find the ratio of the greatest to the smallest net force