How does an electromagnetic pump use a magnetic field to move liquid metal?

An electromagnetic pump is designed specifically to move fluids that are good electrical conductors, such as liquid metals used for cooling nuclear reactors.1

The pump operates on the same fundamental principle as an electric motor. To move the liquid, the pipe carrying the fluid is placed within a magnetic field. An electric current is then passed crosswise through the fluid.1

When a current-carrying conductor is placed in a magnetic field, it experiences the Lorentz force, which acts on the moving charges within the fluid. Because these charges are contained within the liquid, the resulting electromagnetic force is transferred to the fluid itself, pushing it in the direction of the flow. The magnitude of this force is at its maximum when the direction of the current and the magnetic field are perpendicular to each other.231