electricity in air

[Ankit Gupta]

we all knew that two current carrying (in same direction) wire attract each other but if two electrons (or as many as in wire) going in any direction repel each other,then why those wire

[studiot]

The attraction/repulsion effect is due to the magnetic field developed by the travelling charge (electrons).

 

In the case of a wire is takes the form of concentric circles around the axis of the wires.

 

In my sketch the wires are perpendicular to the plane of the screen. I have drawn a couple of circles of the magnetic field lines. Obviously they combine to form a single field. You should draw some for yourself to see how the reinforce in some areas and cancel in others, due to their directions.

Edited September 13, 2013 by studiot

[swansont]

Remember that you don't just have the electrons — wires themselves are electrically neutral; there are the same number of + and - charges there. So the wires don't repel when there's no current.