and 
..................(7.23b)
when the distance 
is very large compared to 
, amplitude variations corresponding to 1/r are important and 1/rn terms 
can be neglected. Retaining the terms containing 1/r variations, which constitute the radiated field or the field in the far zone, the electric and magnetic field components can be written as:
...................................(7.24a)
.......................................(7.24b)
We find that the radiated field has transverse components only and they satisfy the relation
.....................................................(7.25a)
.......................................................(7.25b)