- #1
sahil_time
- 108
- 0
If i move a magnet back and forth in free space, will it radiate?
If it does not then why?
If it does not then why?
Vanadium 50 said:Yes.
Why is it not used for practical purposes?
Is it because it cannot produce high energy radiation?
davenn said:its used for many many different things ... electric motors just to name one
sahil_time said:if a magnet, which although has neutral charge on the whole, but has a magnetic field,
is moved back and forth, will it radiate?
sahil_time said:Why is it not used for practical purposes? Is it because it cannot produce high energy radiation?
Okay, i think the question has been a little vague i guess. Let me rephrase.
--An electron, if moved back and forth, emits radiation. This is the basis of antenna theory.
--In contrast, any neutral metal will not radiate if moved back and forth because it is neutral and
hence does not produce a magnetic field.
--Now, if a magnet, which although has neutral charge on the whole, but has a magnetic field,
is moved back and forth, will it radiate?
The_Duck said:Yes, it will, as Vanadium 50 said in the first reply.
The frequency of the radiation will be equal to the frequency of the oscillation of the magnet, of order 1 Hz. I don't think there is any practical use for such low-frequency radiation. Furthermore the total radiated power will be extremely low.
davenn said:Electrons oscillate back and forward in a conductor when an AC current is applied
the acceleration of that charge generates an electromagnetic field which will be radiated
again, the only thing being radiated is a magnetic field
there is NO RF radiation
there's only a magnetic field, not an electromagnetic field because there is no AC current flowing to generate one
Dave
davenn said:OK
I see where you are coming from
So you are saying that the field outside the magnet is then cutting back through the magnet as the magnet moves within the field and thus generating a current which in turn is generating an EM emission
and OK so its freakin' tiny, nothing like what the OP was indicating or hoping for
Dave
The principle behind the radiation of a moving magnet in free space is based on electromagnetic induction. When a magnet moves, it creates a changing magnetic field which in turn induces an electric field. This electric field then propagates as an electromagnetic wave, radiating energy into the surrounding space.
The speed of the moving magnet directly affects the frequency of the radiated electromagnetic waves. As the magnet moves faster, the frequency of the waves increases. However, the amplitude or intensity of the radiation remains constant.
Yes, the radiation produced by a moving magnet and an electric current is different. While both create electromagnetic waves, the frequency and direction of the waves are different. The radiation from a moving magnet is in the form of circularly polarized waves, while that from an electric current is in the form of linearly polarized waves.
Yes, the strength of the magnetic field directly affects the amount of radiation produced. A stronger magnetic field will induce a stronger electric field, resulting in a higher intensity of radiation. However, the frequency of the radiation remains unchanged.
No, the radiation produced by a moving magnet is in the form of non-ionizing electromagnetic waves, which are not harmful to living organisms. These waves do not have enough energy to break chemical bonds or cause any damage to cells. However, strong magnetic fields can pose a risk to individuals with certain medical devices such as pacemakers or metal implants.