We
had found in Chapter 1 that the electric field on the perpendicular bisector
of the dipole is given by [See Eq (1 21)],
E ≃
pe
x
4
0
3
πε
where x is the distance from the dipole If we replace p à m and 
0
1/0
µ
ε
→
in the above expression, we obtain the result for B for a point in the
plane of the loop at a distance x  from the centre