Thanks to supermagnete.com for providing the magnets I used to perform these two Laplace rail experiments. Here are the magnets used in this video.
First Experiment
S-30-07-N https://sumag.net/s-30-07-n-x01
Second Experiment
S-12-06-N http://sumag.net/s-12-06-n-x01
The phenomenon is governed by Laplace’s second law (often integrated into the definition of the Lorentz force for conductors), which states that a conducting wire of length L, carrying a current I and immersed in a magnetic field B, experiences a magnetic force F expressed by the formula:
F = I . (L x B)
(Where x indicates the vector product).
We can analyze the direction of the forces using the right-hand rule Thumb Direction of the current (I) passing through the crossbar (from one rail to the other). Index finger: Direction of the magnetic field (B) pointing vertically upwards coming from the magnets.Palm/Middle finger: Direction of the resultant force (F), which pushes the bar forward (or backward if the polarity of the current is reversed).
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