Gently tap the board until the pattern forms. The iron filings make a picture. They show the lines of force in the magnetic field. There are strong lines of force between the pole of the magnets. D. Electromagnets are temporary magnets that let us turn magnetic field on and off so we can control the magnetic energy.
People use the power of magnets in many ways.
Magnetism and electricity are closely related. In an electric generator, an electric current is set up in a coil of wire that moves through a magnetic field. An electric current moving through a wire coil wrapped around an iron core produces magnetism. The close interrelationship between magnetism and electricity has many applications. Label a magnet 2.