Journal of Basic and Applied Physics                            
Journal of Basic and Applied Physics(JBAP)
Frequency: Annually
The Use of Coulomb’s Law can Account for the Attractive Force between Electromagnets
Full Paper(PDF, 1871KB)
This paper demonstrates that Coulomb’s Law can account for the attractive force between two electromagnets, provided the respective currents have the same direction of rotation, the electromagnets being aligned along the same axis. The work is based on earlier research showing that Coulomb’s law can account for the forces between collinear currents in Ampère’s bridge. This was done by recognising the need for analysing the delay of action that can be ascribed the different propagation time for the action between parts of two currents due to their relative distance. This will cause the stationary positive ions bound to the metal lattice in an electric conductor to give rise to a different strength of the force field than the moving electrons. The difference between these fields constitutes the so-called magnetic force. It is also necessary to take into account the Lorentz transformation of lengths according to the Special Relativity theory in order to predict the attractive force between two parallel currents. This result explains why two electromagnets carrying currents with the same rotational direction attract each other. This is shown for the simplistic case of one-winding coils.
Keywords:AmpÈRe’S Law; Coulomb’s Law; Propagation Delay; Electromagnets; AmpÈRe´S Bridge; Lorentz Force; Retarded Action; Special Relativity Theory; Lorentz Transformation
Author: Jan O. Jonson1
1.Alumnus of Stockholm University, Sweden and the KTH Technical University Ostmarksgatan 50 n.b., SE-12342 Farsta, Sweden
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