You have just completed the syllabus of the Electromagnetic Fields subject for the Electrical Engineering Branch. Here you will find all the IMPORTANT FORMULAS Of Electromagnetic Fields subject. Formulas of the first chapter have displayed for your illustration.
1. Electromagnetic waves:
Maxwell’s equations predict the existence of electromagnetic waves that propagate in a vacuum with the electric and magnetic fields perpendicular and with ratio:
2. Energy in Electromagnetic waves:
The energy flow rate (power per unit area) of an electromagnetic wave is given by the Poynting vector The magnitude of the time-averaged value of S is called the intensity of the wave
3. Speed of light in materials
When light propagates through a material, its speed is lower than the speed in free space by a factor called the index of refraction
4. Reflection and refraction
At a smooth interface, the incident reflected and refracted rays and the normal to the interface all lie in a single plane. The angle of incidence and angle of reflection (measured from the normal) are equal θr = θa and the angle of refraction is given by Snell’s law:
sinθa = nb sin θb
A polarizing filter passes waves that are linearly polarized along its polarizing axis. When polarized light of intensity Imax is incident on a polarizing filter used as an analyzer, the intensity I of the light transmitted depends on the angle between the polarization direction of the incident light and the polarizing axis of the analyzer
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