 Quote by universal_101
But there should be all these effects when the current is ON, that is, when electrons are moving and therefore there should be length contraction and thus Force.
|
Yes, when the current is ON then the electrons and the test charge are moving, all these effects are present, and there is a force.
In the lab frame the force is attributed to the magnetic force on the moving charge due to the current in the neutral wire. In the electron/test-charge frame the force is attributed to the electrostatic force on the stationary charge due to the net charge in the wire.