**Description**: Resultant and power of the Laplace forces acting on a conductive bar in rectilinear translation on two parallel rails (Laplace rails) in a uniform external magnetic field, stationary and orthogonal to the bar.

**Definitions**

__Lorentz force__: When a wire carrying an electric current is placed in a magnetic field, each of the moving charges, which comprise the current, experiences the Lorentz force, and together they can create a macroscopic force on the wire (sometimes called the **Laplace force**). By combining the Lorentz force law above with the definition of electric current, the following equation results, in the case of a straight, stationary wire. **F = Il x B**