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# Conceptual Questions No.2- Forces between two current elements

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• #364
Hamid

Consider two non parallel wires each carrying a current which located at one plane surface.

Consider two non parallel wires each carrying a current which located at one plane surface.
According to electromagnetic theory, the forces between two straight and solid wires mentioned can be estimated as follow:

F= i . (L x B)

Where the F” is force vector that applied to each wire and “L” and “B” are current path vector and flux density vector respectively. Also “i” is amount of current and “x” is vector multiply symbol.Therfore the vector of forces are perpendicular to “L” or wires body.

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• #1170
Hamid

According to electrical engineering experience, two free wires carrying currents can not stable non parallel, and applied electromagnetic torque to each wire rotate them and they will be parallel after short time.Therefor in non parallel configuration of wires we need to assume one supplementary mechanical force in system which we were not considered it. Of course in free wires moving duty we have involved with problem yet. In that condition because of magnetic field variation, the mass of magnetic field change due to wires moving. Therefore the essential principle of survival momentum is fulfilled and we can forget that inconsistent (action and reaction forces) temporarily. What is your opinion?

#1171
Hamid

The law of conservation momentum is one of essential law in classic and modern physics that shall not contravene. Also as you know the electromagnetic field similar to other forces field is a form of energy and energy is equal to mass, therefore the changing of electromagnetic field cause mass or momentum changing.

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