Electrostatic force on a charge

AI Thread Summary
Coulomb's Law is considered incomplete because it does not account for the velocity and acceleration of charges, which are important in electrodynamics. The discussion highlights that the force between charges also depends on their motion, leading to the concept of magnetism. The Lienard-Wiechert potentials are referenced as a more comprehensive framework for understanding forces on moving charges. It is noted that Coulomb's work predates the discovery of velocity-dependent forces, which explains the absence of these factors in his law. Overall, the conversation emphasizes the evolution of understanding in the field of electrodynamics beyond static conditions.
astro2cosmos
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i was reading the book of Griffin - introduction to electrodynamics. it is written that the force of charge q on Q is not only depends on the distance b.w them but also the velocity & acceleration of charge q.then i think coloumb'law is incomplete at all. it must include some quantity for velocity or acceleration. ian't it right?
hope for this >>>>>>>>
 
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astro2cosmos said:
i was reading the book of Griffin - introduction to electrodynamics. it is written that the force of charge q on Q is not only depends on the distance b.w them but also the velocity & acceleration of charge q.then i think coloumb'law is incomplete at all. it must include some quantity for velocity or acceleration. ian't it right?
hope for this >>>>>>>>

Yes, "coloumb'law" is incomplete. This incompleteness is a topic within the field of electrodynamics (note the phrase *dynamics* as opposed to statics), an introduction to which is presumably given in the book you mentioned.
 
Yes. If you go further on in the book, you will get to the Lienard-Wiechert potentials which replace Coulomb's law for moving and accelerating charges.
 
astro2cosmos said:
it is written that the force of charge q on Q is not only depends on the distance b.w them but also the velocity & acceleration of charge q.then i think coloumb'law is incomplete at all. it must include some quantity for velocity or acceleration. ian't it right?

The dependence of the force on the velocity of q is usually called "magnetism." :biggrin:
 
jtbell said:
The dependence of the force on the velocity of q is usually called "magnetism." :biggrin:

yes it may right like it is something electromagnetic force b.w the particles, then why didn't coloumb mention it in his Law??
 
astro2cosmos said:
yes it may right like it is something electromagnetic force b.w the particles, then why didn't coloumb mention it in his Law??

Isn't Coulomb's Law confined to electrostatics? That might be why...

http://en.wikipedia.org/wiki/Coulomb's_law

No v or a in his equation that I can see...
 
astro2cosmos said:
yes it may right like it is something electromagnetic force b.w the particles, then why didn't coloumb mention it in his Law??


The man's name is Coulomb not "coloumb". He studied electricity a long time ago... He didn't get *everything* exactly right but he got pretty close. Cut the man some slack. Geez.
 
astro2cosmos said:
why didn't coloumb mention it in his Law??

Because at the time Coulomb did his work, the velocity-dependent force hadn't been discovered yet!
 

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