Two charges `pm10muC` are placed 5.0 mm apart. Determine the electric field at (a) a point P on the axis of the dipole 15 cm away from its centre O on the side of the positive charge, as shown in Fig. 1.21(a), and (b) a point Q, 15 cm away from O on a line passing through O and normal to the axis of the dipole, as shown in Fig. 1.21(b).
FIGURE 1.21

Explanation

(a) ` 2.6 xx 10^(5) N //C ` along the dipole moment
(b) ` 1. 33 xx 10^(5) N //C` opposite to dipole moment