Animation shows a conductor rotating about a verticsl axis in a magnetic field drected parallel to the axis with its end sliding on smooth circular conducting rail. (The plane of motion is horizontal). A cell is connected through a resistance between the axis and the rail. When the switch is closed, the current through the conductor causes it to experierence a force that causes rotation of the conductor. As the conductor rotates the emf induced in it opposes the exteranal cell and causes the current to decrease. This in turn causes the torque on the conductor to decrease. Eventually the conductor has no current in it and rotates at a steady speed.
The blue curve shows the current in the conductor. This is also equal to the electrical power generated in the moving conductor.
The red curve represents the magnitude of angular velocity.