Yes, and a charge moving in a circle will give you a magnetic field.
Actually, in coil electrons don't move in circle, but in spiral. Single electron is just once passing through wire.
When electrons flow in one direction in coil of course it will produce magnetic field, that anybody with "compass array" device can see on his own eyes.
But if we will use alternating current, electrons flow once in one direction, once in opposite direction.
Can you detect magnetic field when frequency of AC would be counted in millions or billions Hz?
What does show "compass array" device, if you will place it close to coil through which there is flowing low frequency AC, or high frequency AC.. ?
What does show "compass array" device, if you will place it close to discharge tube with Hydrogen and turn high voltage on to ionize it.. ?
The issue I see here is that spectral lines are obtained from discharge tube, with ionized plasma.
But electric neutral Hydrogen gas is not mixture of proton and electron, but H2 molecule, two protons and two electrons.
ps. Where in USA and UK somebody can buy "compass array" like below one? I searched couple times on Google and can't find anything.. Here it costs $40 in the regular shop.
Whenever somebody asks on physics forum about "moving electron in circle around proton" I know they don't mean it literally. Circle is 2d figure, with missing one axis to 3d. Analyze should be done using the all 3 dimensions.
What are your predictions of magnetic field lines around it for such "coil".. ? Imagine it's single long wire.
Edited by Sensei, 23 July 2014 - 07:13 AM.