If two parallel wires have current in same direction they will absorb each other.
because of magnetic field produced by one and current moving in another wire.
F=qvB.
So far there is no problem.
I don't understand this force in particle level.
So imagine there is two beam of electrons (without wire) that are parallel and have the same velocity.
So according to the equations we have learned before, this electron must absorb each other.
But the problem is these electrons are stationary in relation to each other.
Please help me I am confused!!!!
Dear Azizi,
If you have two wires with currents in the same direction and with the same magnitude, the wires will attract each other with forces of the same intensity.
However, when you talk about particles, there is no limitation of the charges movement, since there is no wire to bind them together. What you will probably notice is that the beams will merge, but not the electrons themselves. If you look at the interaction forces between two electrons moving in the same direction and speed at a given distance, this distance will reduce until their repulsive forces balance with the magnetic force caused by its movement.
I hope it helps you!
Thanks for response Murilo
What do you mean by the beams will merge but not the electrons?
there is nothing except electron in the beam. So this force is applied to what? electrons?
When magnetic field is present, the magnetic force will be applied over the moving charges, in this case, the electrons. But you need to consider that there is also a Coulomb force in action.
Even if there are only electrons in the beam, it is not massive, since there are spaces between the electrons in the beam. When I said that the beams would merge is that the electrons will only find a new arrange while moving, to balance the attracting magnetic force and the Coulomb force that repeals them. However, the intensity of Coulomb's law increases with the proximity of the electrons. In this case, the speed of the moving charges would need to be very high for the attractive magnetic force surpass the Coulomb's repealing force. The beams would only merge if the charges were moving in a very high speed. I didn't do the calculation to obtain the moving charge speed in which the beams would move, but it would be probably a very high value.
This attached link may help.
http://physics.stackexchange.com/questions/71378/two-electron-beams-exert-different-forces-on-each-other-depending-on-frame-of-re
thanks marilo your answer is correct about speed of beams that may compensate Coulomb force in very high speed but the question is because the electrons are stationary in relation to each other there should be no magnetic force between them and there must be just coulomb force .
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