Opposite charges attract.
Similar charges repel.
There is a connection between electricity and magnetism. In 1820, Hans Christian Oersted, a Danish scientist discovered that electric currents create a magnetic field . In 1873, James Clerk Maxwell demonstrated the relationship mathematically in four equations known as Maxwell's Equations , which are the foundation for the theory of electromagnetism. Everyone has a basic familiarity with wave phenomena. Throw a stone into a pond and observe the waves moving outward from the central point.