This document discusses the relationship between magnetism and electricity, and how this relationship led to the development of motors. It explains that Michael Faraday discovered that a current-carrying conductor in a magnetic field experiences a force perpendicular to both the magnetic field and current direction. This effect is known as the Lorentz force. The magnitude of the Lorentz force depends on the current, magnetic field strength, and length of conductor in the field. This relationship between electricity, magnetism, and force allowed for the development of the first electromagnets and motors. Motors have since become widely used in factories and homes to provide convenience and power.