Electromagnetic Waves | Engineering Physics
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
'2' Marks Questions with answers : Engineering Physics: Electromagnetic Waves
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
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Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
Let us consider a monochromatic (single frequency) uniform plane wave that travels through one medium (vacuum) and enters another medium (non-conducting) of infinite extent.
Electromagnetic Waves
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
A typical cell phone contains a tiny low-power radio transmitter or antenna.
Electromagnetic Waves
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
It is important to note that as EM waves carry energy, they also carry momentum.
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
The magnitude of the average value of at a point is called the intensity of radiation at that point.
Electromagnetic Waves
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
Electromagnetic waves transports energy from one region to another.
Hertz experiment
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
It follows from Maxwell's equations that electromagnetic radiation occurs whenever electric charge accelerates.
Electromagnetic Waves
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
Due to this fact, EM waves cannot be polarized in the direction they are travelling. So EM waves are never longitudinally polarized.
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
Any stationary charge produces only electric field.
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
Electromagnetic waves are produced by accelerated charges.
Electromagnetic Waves
Subject and UNIT: Engineering Physics: Unit II: Electromagnetic Waves
This is the general wave equation for the electric vector in an electromagnetic wave propagating in conducting medium.