- #1
mgkii
- 138
- 42
Can someone correct my understanding on electromagnetic waves please; I've clearly got the wrong end of a stick somewhere, but can't figure out where my misunderstanding is! Thanks.
If I draw a classic EM wave with the electric field on the up and down axis and the magnetic field at right angles, then both of the sine waves cross the time (or distance) axis at the same points. What I really don't get is "where is the energy" at this point? I can comprehend that a moving electric field generates a magnetic field and vice-versa and that this is how the wave propagates over a distance, but if the heights above and below the axis represent field strength and therefore (possible mistake) a level of energy, then what's happening at the point they both cross the axis, and how does the next phase of the wave get "kick started"?
Don't shoot me... I know I've missed something, I just can't see what!
Thanks
Matt
If I draw a classic EM wave with the electric field on the up and down axis and the magnetic field at right angles, then both of the sine waves cross the time (or distance) axis at the same points. What I really don't get is "where is the energy" at this point? I can comprehend that a moving electric field generates a magnetic field and vice-versa and that this is how the wave propagates over a distance, but if the heights above and below the axis represent field strength and therefore (possible mistake) a level of energy, then what's happening at the point they both cross the axis, and how does the next phase of the wave get "kick started"?
Don't shoot me... I know I've missed something, I just can't see what!
Thanks
Matt