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24.1 Maxwell's Equations: Electromagnetic Waves Predicted and Observed
The 50-foot radar dish antenna at Kennedy Space Center in Florida helps track expendable launch vehicles with high-definition imagery.
The first use of this C-band radar dish was for the launch of the Atlas V rocket.
The greatest theoretical physicist of the 19th century was from Scotland.
A 19th-century physicist named James Clerk Maxwell developed a theory that explained the relationship between electricity and magnetism and predicted the cause of visible light.
The work of brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday were brought together by Maxwell and he added his own insights to develop the overarching theory of electromagnetism.
The mathematical statement of the equations is beyond the level of the text.
The equations show how simple mathematical statements can unite and express a lot of concepts.
The electric field is defined as the force per unit charge on a test charge, and the strength of the force is related to the electric constant, also known as the permittivity of free space.
Gauss's law for electricity is a special form of Coulomb's law that was obtained from the first equation.
There are no magnetic monopoles.
The permeability of free space is related to the strength of the magnetic force.
Gauss's law for magnetism is the second part of the equations.
An electric field is created by a changing magnetic field.
The emf is against the change.
The third of Maxwell's equations is the law of induction.
Magnetic fields can be generated by moving charges or electric fields.
Ampere's law is encompassed by this fourth of the equations.
The major laws of electricity and magnetism are encompassed in the equations.
The symmetry that was introduced in his framework is not apparent.
The hypothesis that changing electric fields create magnetic fields is important.
This is similar to the law of induction and fits nicely into the equations.
Symmetry can be seen in a wide range of situations.
Symmetry plays a major part in the search for sub-atomic particles using large multinational particle accelerators.
The electric and magnetic forces are both manifestations of the same thing.
Current attempts to unify the four basic forces in nature are motivated by the classical unification of forces.
The weak magnetic fields could not be easily detected at the time of the hypothesis.
AC circuits produce changing electric fields.
He predicted that the waves generated by the jumping fish would travel from the source to the lake.
The waves predicted by Maxwell would consist of magnetic and electric fields.
It is possible that the waves are capable of exert force on charges far from their source.
According to Maxwell, light can be detected by the eye because it has such wavelength.
It remained to be seen if other wavelengths existed.
The greatest triumph of physics sinceNewton would be verified if that was the case.
It took a few years for experimental verification to come about.
The German physicist was the first to generate and detect certain types of waves.
He did a series of experiments in the 19th century that proved that the waves travel at the speed of light.
There were sparks that were visible evidence of the current in the circuit that was generated by high voltages across the gap in the loop.
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