Electromagnetic means that magnetic power caused by the electric current flowing through the led, this means that if you leave the power flow in the object will cause a magnetic field around the conductor.
Electromagnetic means magnetism caused by an electric current flows through the conductor means if the current flowing in the conductor will cause a magnetic field around the conductor.
Electromagnetic means magnetism caused by current flowing through the conducting objects means that if the electrical current to flow in the conducting objects will cause a magnetic field around the conductor.