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प्रश्न
Answer briefly.
State two characteristics of an EM wave.
थोडक्यात उत्तर
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उत्तर
- The electric and magnetic fields, `vec"E"` and `vec"B"` are always perpendicular to each other and also to the direction of propagation of the EM wave. Thus, the EM waves are transverse waves.
- The cross product `(vec"E"xx vec"B")` gives the direction in which the EM wave travels. `(vec"E" xx vec"B")` also gives the energy carried by EM wave.
- The `vec"E"` and `vec"B"` fields vary sinusoidally and are in phase.
- EM waves are produced by accelerated electric charges.
- EM waves can travel through free space as well as through solids, liquids, and gases.
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पाठ 13: Electromagnetic Waves and Communication System - Exercises [पृष्ठ २४०]
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