Question
State the research done by scientists on electromagnetism after Oersted's observation.

Answer

After the observation of Oersted, in 1864 James Maxwell examined the laws governing electricity and magnetism and concluded that light is an electromagnetic wave.
Scientist Hertz discovered radio waves and, Jagdish Bose, Marconi produced radio waves experimentally by the end of the $19^{\text {th }}$ century.
This led to the invention of devices for generation, amplification, transmission and detection of electromagnetic waves in the $20^{\text {th }}$ century.

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