What are electromagnetic fields (emf)

1. What are Electromagnetic Fields
(EMF)
• You would have studied in school that an electric charge repels a
similar electric charge but attracts an opposite electric charge.
The influence of an electric charge on another particle located
some distance away is termed its field. The strength of this
repulsion or attraction is termed the electric field strength. Field
strength falls off rapidly with distance, the "Inverse Square" Law.
When the electric charges are stationary, they produce only an
electric field. When an electric charge is in motion, it produces a
magnetic field as well. The electric field and magnetic field
caused by a moving electric charge combine & interact to form an
electromagnetic field. Radio signals, TV signals are carried over
these electromagnetic waves. Light, including sunlight, is also an
electromagnetic wave. The sun is the biggest source of
electromagnetic radiation reaching the earth. All electric wires,
appliances etc generate electric waves, and magnetic waves too if
the charges are moving.