Two particles A and B having opposite charges
Question:

Two particles A and B having opposite charges $2.0^{\times 10^{-6}} \mathrm{C}$ and $-2.0^{\times 10^{-6}} \mathrm{C}$, are placed at a separation of $1.0 \mathrm{~cm}$.

(a) Write down the electric dipole moment of this pair.

(b) Calculate the electric field at a point on the axis of the dipole $1.0 \mathrm{~m}$ away from the centre

(c) Calculate the electric field at a point on the perpendicular bisector of the dipole and $1.0 \mathrm{~m}$ away from the centre.

Solution: