# finding polarization of radiated far-zone electric field

I am given a question in which I have to find the polarization of the radiated far-zone electric fields when phi is 0 and 90. Why are the following formulas used respectively? For phi = 0 $$E_\theta = jn\frac{kI_0le^{-jkr}}{4\pi r} cos\theta$$

For phi = 90

$$E_\theta = jn\frac{kI_0le^{-jkr}}{4\pi r} . 1$$

• Welcome to EE.SE - what has your own research shown and what specifically do you not understand? – Peter Smith Apr 1 at 13:11
• @PeterSmith, sorry i wanted to find for phi 0 and 90 respectively. – Ahmad Qayyum Apr 1 at 13:20