How Are Electric and Magnetic Fields Produced in Electromagnetic Radiations?

[Confused mind]

I have encountered a problem that how electric and magnetic fields at perpendicular to each other are produce in electromagnetic radiations?

 

[scottdave]

Not knowing exactly what you already know about electric and magnetic fields, I will point you to this resource http://www.phy.davidson.edu/instrumentation/NEETS.htm

In particular, look at Module 10 - Introduction to Wave Propagation, Transmission Lines, and Antennas

 

[sophiecentaur]

I have encountered a problem that how electric and magnetic fields at perpendicular to each other are produce in electromagnetic radiations?

This is only the case in the 'far field' of a radiator. Right up close, the fields can have a range of relative angles around, say, a simple antenna. It is only when the fields have settled down at a distance and there is only energy being transferred and not stored (as in a Capacitor or Inductor). A plane EM wave in space is the simplest case.

 

[Drakkith]

This is only the case in the 'far field' of a radiator. Right up close, the fields can have a range of relative angles around, say, a simple antenna.

Is that so? Huh. I never knew that. I thought the angle was always 90 degrees.

 

[sophiecentaur]

Is that so? Huh. I never knew that. I thought the angle was always 90 degrees.

It is when the only wave is a progressive wave. In the standing wave region the fields will be the resultant of various traveling waves in different directions. Also, in waveguides, not all the modes are TEM, there are TE modes too. Coax is always TEM, though.
Near to an antenna you can get different modes which are not TEM and it happens, I think, when you have waves from different parts of the antenna, traveling in different directions.