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Maxwell's Theory of the Electromagnetic Field

Maxwell's Equations

§ Maxwell's Equations by James Clerk Maxwell ( Scottish, 1831 - 1879 ):

From his original 1861 Maxwell's Theory of the Electromagnetic Field  "On Physical Lines of Force"

§ Defining terms:

electric charge definitions

§ Maxwell's equations:

maxwell's equations

§ Lorentz Force Law:

Lorentz force law

§ Unifying all of electrodynamics:

What makes for the unity of all of electrodynamics is Maxwell's equations plus Lorentz Force Law.

§ Interpreting Maxwell's equations:

equation (1): In the presence of an electric charge, the resulting electric field will be such that the electric charge will be exactly compensated by the electric displacement;

equation (2): An equal amount of magnetic displacement passes outward thru every closed surface as it passes inward into the same closed surface

- i.e., that the magnetic field lines must be closed loops since there are no such things in nature as free magnetic charges;

equation (3): Every magnetic displacement current has a reverse sense electric field;

equation (4): Every electric current produces its own magnetic field.

Maxwell wrote in his  Maxwell's Theory of the Electromagnetic Field  "A Dynamical Theory of the Electromagnetic Field" ( 1864 ), pg. 499, part ( 97 ) [ note: pg. 41 of this pdf. ], that

"The agreement of the results seems to show that light and magnetism are affections of the same substance, and that light is an electromagnetic disturbance propagated through the field according to electromagnetic laws."

§ Maxwell's Theory of the Electromagnetic Field:

According to Maxwell's equations, electromagnetic radiation ( EM ) is a self - propagating transverse wave with electric and magnetic components where the oscillating electric and magnetic field components induce their respective opposites and vice-versa. These electric and magnetic components oscillate at right angles to each other and propagate perpendicularly to the direction in which they indefinitely travel unless absorbed by intervening matter. That is, each kind of field - electric and magnetic - generates the other in order to propagate the entire composite structure moving forward through empty space at the finite speed of light, c. In order of increasing frequency, the types of electromagnetic waves include radio and television waves; microwaves; infrared radiation; visible light; ultraviolet light; x - rays; gamma rays; and finally, cosmic rays.

Simple harmonic motion

transverse wave

§ Maxwell:  Maxwell's Theory of the Electromagnetic Field "On Faraday's Lines of Force", Transactions of the Cambridge Philosophical Society, Vol. X, Part I - read on Dec. 10, 1855 and Feb. 11, 1856

Maxwell's Theory of the Electromagnetic Field

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