Is there any force which can neutralise or cancel out a electromagnetic force emitted by a source? For me it seems impossible becouse EM waves seems to be overlapping each other rather than having neutralization effect. But still there is a doubt if something with greater intensity, force and interception would tend to act upon the EM waves and force to change its character and behaviour.
2006-09-15 01:24:18 · 4 answers · asked by orsel 2 in Science & Mathematics ➔ Physics
If you have 2 radiating surfaces (antennas) with zero separation and opposite polarity signals, the EM fields will cancel each other out. The problem with that, of course, is to get zero separation. You can only get close, in which case you only have partial cancelling.
If the separation distance is 1/2 the signal wavelength, things get interesting. Then you have a "phased array", where the signal cancels in some directions and enhances in others.
Note: I do not mean to say that phased arrays need to be spaced at 1/2 wavelength. You can also vary the signal phase shift to achieve the same effect with different separations.
2006-09-15 05:03:21 · answer #1 · answered by semdot 4 · 0⤊ 0⤋
of course it's possible. examples of technology that already uses this:
radar jamming
radio jamming
signal nullifiers
(for sound) gray noise machines
it is possible to cancel any wave by overlaying it with another wave in the proper set up. Further, most jamming devices go for it the easy way... they broadcast the same frequency at a much higher power and simply block out any transmissions made on that frequency
2006-09-15 12:23:37 · answer #2 · answered by promethius9594 6 · 0⤊ 0⤋
It is hypothetically possible, but if you tried to set up an experiment it would be extremely difficult to accomplish. IF you could get all the waves to exactly oppose each other there would be no force produced.
Also; even if you did that, it would only be for a microscopic point, a micron or two either way, and you'd be back into the force field.
2006-09-15 09:27:34 · answer #3 · answered by tgypoi 5 · 0⤊ 1⤋
Out of phase light waves do cancel each other out, resulting in darkness. That is a localized case of one EM field cancelling another.
2006-09-15 09:20:31 · answer #4 · answered by campbelp2002 7 · 0⤊ 0⤋