[SI-LIST] Re: how EM wave propagates through space
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 04 Oct 2011 09:21:50 -0700
A detailed answer is typically provided by a one hour second semester
physics lecture. What physics references have you looked at that
confuse you? What do you find confusing about them?
Steve.
On 10/4/2011 9:07 AM, S A wrote:
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> Hi All,
> I agree with Vinodh. Mine and his question is the same
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> Thanks,
> Shahbaz Assad
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>> From: ah.vinod@xxxxxxxxx
>> Date: Tue, 4 Oct 2011 20:08:10 +0530
>> Subject: [SI-LIST] Re: how EM wave propagates through space
>> To: si-list@xxxxxxxxxxxxx
>>
>> Hi All,
>> Can anyone please explain the EM wave movement in free space rather than
>> going into equations. It is very easy to quote Maxwell's equations& complex
>> mathematical derivations to explain but physically how does the
>> wave propagate as we know that for electric field to exist there should be a
>> charge and free space has no charge!!!.For magnetic field to exist the
>> charge should be in motion and if charge is only not there where is the
>> point of motion!!! If i am wrong do correct me.
>>
>> Regards
>> Vinod A H
>> EchoStar Corporation
>>
>> On Tue, Oct 4, 2011 at 7:52 PM, Ihsan Erdin<erdinih@xxxxxxxxx> wrote:
>>
>>> Shahbaz,
>>> A few corrections to your assumptions follow. First, the electric field is
>>> due to the charge (electron) itself not its motion. The charge motion is
>>> attributed to the magnetic field but indeed magnetic field originates from
>>> the spin properties of matter which is a more complex quantum effect. You
>>> can find a good presentation of this subject in the following portal
>>>
>>> http://en.wikipedia.org/wiki/Portal:Electromagnetism
>>>
>>> The second issue is that you don't need conductors for field propagation.
>>> EM
>>> fields will propagate in vacuum, as well. Maxwell-Ampere law relates the
>>> time varying electric field to the curl (rotation) of the magnetic field
>>> through displacement current. In other words, a time varying electric field
>>> generates magnetic field. Maxwell-Faraday law, on the other hand states a
>>> time varying magnetic field is the source of electric field. The
>>> interleaved
>>> generation of the electric and magnetic fields from one another is the
>>> cause
>>> of energy propagation in the permeating field at the speed of light.
>>>
>>> Regards
>>>
>>> On Tue, Oct 4, 2011 at 5:38 AM, S A<shahbaz_assad@xxxxxxxxxxx> wrote:
>>>
>>>>
>>>>
>>>>
>>>> Hi Experts,
>>>>
>>>> My question is related to propagation of EM waves.
>>>> As EM waves have electric field and magnetic field and as we know that
>>>> electric field is due to the motion of electrons and require some
>>> conducting
>>>> medium.But I am confused that how EM wave propagate through space. what
>>>> happens to the electric and magnetic field?
>>>> I am sorry my question is very basic. but what happens to the electric
>>> and
>>>> hence magnetic field in space and how these fields exists in space.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Thanks,
>>>> Shahbaz Assad
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>
>>> --
>>> Ihsan Erdin
>>>
>>>
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--
Steve Weir
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