# Maxwell's Four Equations

February 14th Fact-of-the-DayIn the 1870's James
Clerk Maxwell was able to put together four important equations
that govern the three-dimensional electric and magnetic fields in electromagnetic
energy. He did that merely on the basis of early experimental evidence
obtained by means that are crude by today's standards. Even so, his equations
have withstood the test of time and still are important today, not only
because they define all points in the electric and magnetic three-dimensional
vector fields, but because they can be used to establish the wave nature
of electromagnetic radiation. They can be rewritten in several forms.
Stokes' theorem can be used to rewrite two of them to show that the curl
of the electric field always is zero. The divergence theorem can be used
to rewrite the other two to show that the divergence of the electric field
is proportional to the charge density. *©2005 Martek International All
rights reserved.*

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