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Electromagnetic Waves

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Richard Datwyler

on 15 March 2016

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Transcript of Electromagnetic Waves

Electromagnetic Waves
Poynting Vector

Electromagnetic waves are self propagating electric fields and magnetic fields. The changing of one creates the other.
They are at right angles to each other, as shown below.
In addition the magnitudes of the fields are related via the velocity.
The direction of propigation is given using the RHR, and with the intensity the Poynting vector describes both.
Noting that the wave follows a sinusoidal motion, the average is more telling. Taking this into account and putting the two together gives:
The amplitude of the electric field of an EM wave is 50 V/m. What is the amplitude of the magnetic field?
If the wave is traveling in the x direction, and the B field is initially in the -y direction, what direction is the E field initially?
What is the average intensity of this wave?
+ Z
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