(b) A positive point charge +Q is positioned at a fixed point X and an identical positive point charge is positioned at a fixed point Y, as shown in Fig. 6.1. X +Q A 2.5 cm 10.0 cm Fig. 6.1 B Y +Q 2.5 cm The charges are separated in a vacuum by a distance of 10.0 cm. Points A and B are on the line XY. Point A is a distance of 2.5cm from X and point B is a distance of 2.5cm from Y. The electric field strength at point A is 4.1 × 10⁻⁵ Vm⁻¹. (ii) On Fig.6.2, sketch the variation of the electric field strength E with distance d from A to B, along the line AB. 5 E/10⁻⁵ V m⁻¹ 4- 3 2 1 0+ 0 -1 -2- -3- -4- -5- 1 2 3 d/cm 4 5 Fig. 6.2