Question

Two particles A and B having oposite charges $2.0\times {10}^{-6}C$ and $-2.0\times {10}^{-6}C,$ are placed at a separation of 1.0 cm. (a) Write down te electric diple moment of this pair. (b) calculate the electric field at a Point on the axis of the dipole 1.0 m away from the centre. (c) Calculat the electric field at a point on the perpendicular bisector of the dipole and 1.0 m away from the centre.

Answer 1

(a) Dipole moment $=q\times 1$
[where q = magnitude of charge, l = separation between the harges]
$=2\times {10}^{-6}\times {10}^{-2}c-m=2\times {10}^{-8}c-m$
(b) We know , electricifield at axial point of the dipole $=36\times {10}^{7}N/C$

(c) We know electri field at a point on the perpendicular bisector about 1 m away from the centre of dipole
= 180 N/C