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srp
science forum Guru Wannabe

Joined: 30 Apr 2005
Posts: 198

Posted: Mon Jun 13, 2005 10:52 pm    Post subject: Re: Some Electromagnetism questions

"Fergus" <Ferguscapewrath@yahoo.co.uk> a écrit dans le message de news:
ir2sa1d62ih8epv30kcuob5l402mkc8ea9@4ax.com...
 Quote: On Sun, 12 Jun 2005 12:51:58 GMT, "srp" wrote: "EMy" a écrit dans le message de news: 1118537451.741900.84460@z14g2000cwz.googlegroups.com... 1. What formula correctly describes the immeasurable force between moving charges? When only a few charges are involved, simply the Coulomb equation, for more complex situations, the Gauss law is the tool. If the charges are moving then you need to include magnetic effects. So you need Coloumb + Biot Savart + Lorentz. It ain't a trivial problem!

Not necessarily. If an external magnetic is not applied, it is perfectly
possible to have only electric interaction to deal with even if the
charges are moving. But you are right, if a magnetic field is involved.

 Quote: Not sure what you mean by "immeasurable".

Me neither. The force is measurable in most circumstances.

André Michaud
Fergus
science forum beginner

Joined: 10 May 2005
Posts: 6

Posted: Mon Jun 13, 2005 8:44 pm    Post subject: Re: Some Electromagnetism questions

On Sun, 12 Jun 2005 12:51:58 GMT, "srp" <srp@microtec.net> wrote:

 Quote: "EMy" a écrit dans le message de news: 1118537451.741900.84460@z14g2000cwz.googlegroups.com... 1. What formula correctly describes the immeasurable force between moving charges? When only a few charges are involved, simply the Coulomb equation, for more complex situations, the Gauss law is the tool.

If the charges are moving then you need to include magnetic effects.
So you need Coloumb + Biot Savart + Lorentz. It ain't a trivial
problem!

Not sure what you mean by "immeasurable".

 Quote: 2. How does one reconcile the contradiction between the Biot-Savart/Lorentz force and Newton's third law? What contradiction are you referring to ? 3. Why did Maxwell praise Ampere's work but ignore his force law? He did not ignore it. He generalized it to become the 4th equation, from which the speed of light can be calculated. André Michaud

--
Fergus
srp
science forum Guru Wannabe

Joined: 30 Apr 2005
Posts: 198

Posted: Sun Jun 12, 2005 10:51 am    Post subject: Re: Some Electromagnetism questions

"EMy" <magnetofeynman@yahoo.com> a écrit dans le message de news:
 Quote: 1. What formula correctly describes the immeasurable force between moving charges?

When only a few charges are involved, simply the Coulomb equation,
for more complex situations, the Gauss law is the tool.

 Quote: 2. How does one reconcile the contradiction between the Biot-Savart/Lorentz force and Newton's third law?

What contradiction are you referring to ?

 Quote: 3. Why did Maxwell praise Ampere's work but ignore his force law?

He did not ignore it. He generalized it to become the 4th equation, from
which the speed of light can be calculated.

André Michaud
Dave
science forum Guru Wannabe

Joined: 23 Apr 2005
Posts: 191

Posted: Sun Jun 12, 2005 8:56 am    Post subject: Re: Some Electromagnetism questions

"EMy" <magnetofeynman@yahoo.com> wrote in message
 Quote: 1. What formula correctly describes the immeasurable force between moving charges?

if its not measurable how could anything describe it?

 Quote: 2. How does one reconcile the contradiction between the Biot-Savart/Lorentz force and Newton's third law?

describe the contradiction mathematecally using all appropriate formulas and
it will be reconciled.

 Quote: 3. Why did Maxwell praise Ampere's work but ignore his force law?

oversight? or maybe he didn't like it? have you tried asking him?

 Quote: 4. What must be added to Wilhelm Weber's incomplete theory of 1848 so that it can predict electromagnetic radiation?

maybe it was incomplete because he didn't try to describe electromagnetic
radiation. but i bet if you add maxwell's equations it will predict em

 Quote: Ty. EMy
EMy
science forum beginner

Joined: 11 Jun 2005
Posts: 7

 Posted: Sat Jun 11, 2005 10:50 pm    Post subject: Some Electromagnetism questions 1. What formula correctly describes the immeasurable force between moving charges? 2. How does one reconcile the contradiction between the Biot-Savart/Lorentz force and Newton's third law? 3. Why did Maxwell praise Ampere's work but ignore his force law? 4. What must be added to Wilhelm Weber's incomplete theory of 1848 so that it can predict electromagnetic radiation? Ty. EMy

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