# Recent content by Doug007

1. ### Magnetic fields

But a charge would need to be attached to a geometric point in order for movement to be defined and this would necessitate the introduction of non uniform charge distribution. The attachment of a uniform plane of charge would not distinguish it - in terms of movement - from an unattached one...
2. ### Magnetic fields

The first paragraph of your reply is relevant to my question, but I'm afraid the rest isn't - I understand the generation of magnetic field via the equations you qoute. I have reformulated the OP as... "If I'm sitting above an infinite continous 2D plane how can I tell if I'm moving relative...
3. ### Magnetic fields

But how can a reference frame for the charges be constructed because there arn't any? It's a uniform continuous distribution of charge with no discrete points of any form - charge or otherwise - to refer to!!!
4. ### Magnetic fields

Thanks for replying. I do understand your reply but I still have the problem. I've tried to reformulate it as... If I'm sitting above an infinite continous 2D plane how can I tell if I'm moving relative to the plane or not (not nearer or closer to, just parallel to)? Presumably I must know...
5. ### Magnetic fields

This is a tricky issue to describe. I think it may come down to the problem of assigning a velocity to a infinite uniform field as hinted at by the other reponse.
6. ### Magnetic fields

I've been trying to get my head around the generation of magnetic fields from moving charges. I can see how a moving point charge or even electrons that constitute a current in a wire can generate a magnetic field but when I extend this concept to an idealised current - an infinite uniformly...