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What are electromagnetic waves?
Electricity can be static, like what holds a balloon to the wall or makes your hair stand on end.
Magnetism can also be static like a refrigerator magnet. But when they change or move together, they make waves - electromagnetic waves.
Electromagnetic waves are formed when an
electric field (shown as blue arrows) couples with a magnetic field
(shown as red arrows). The magnetic and electric fields of an
electromagnetic wave are perpendicular to each other and to the direction of
James Clerk Maxwell and Heinrich
Hertz are two scientists who studied how electromagnetic waves are
formed and how fast they travel.