Question

Who proposed an electromagnetic theory of light.

Answer 1

Electromagnetism is the phenomenon that deals with the interaction between the Electric field and Magnetic field. In the system, Stationary charges lead to an electric field, and moving charges in a system leads to a magnetic field. The Electric field and Magnetic field direction are always perpendicular to each other, and the wave travels at the speed of light.

Complete step by step solution:
The Scottish scientist and mathematician named James Clerk Maxwell, gave the correlation between electricity and magnetism for the first time using Maxwell’s equations.
During the $19$th century, Michael Faraday was the foremost experimenter on electricity and magnetism in the world. He found out how to make electric current by moving magnets, the principle behind all-electric generators to this day. And the principle of induction, behind the transformers. He constructed the first-ever electric motor. Although he got nowhere near the electronics that run our computers, phones, etc.
Faraday was not well educated as to be able to find out the equations for his field. Fortunately, one of the greatest theoretical physicists of all time, James Clerk Maxwell (white, male, middle-class Scottish) was his near contemporary. He put the equations together and watched that one term was missing here, it did not drop out of the experiments easily.
Maxwell immediately saw that one of the solutions of his (now neatly symmetric) equations was a wave traveling at a particular speed. The speed only depended on the electric permittivity and the magnetic permeability $\mu$ of the medium the waves passed through. and $\mu$ were known already for lots of substances.
Maxwell plugged in the values of vacuum ϵ and μ to find the speed of electromagnetic waves in vacuum
Finally, James Clerk Maxwell proposed the electromagnetic theory of light.

Note: The basic ideas in electromagnetic theory are “a changing electric field generates a magnetic field” and “a changing magnetic field generates an electric field.”
Maxwell’s theory describes that the electric and magnetic fields which were once perceived as two separate fields are different, coupled components of the same field.
The electric fields are always accompanied by magnetic fields and vice versa, and through their interactions with particles and within particles, they produce electromagnetic radiation.