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Electromagnetic Waves
Electromagnetic Waves – Energy Density
1 question from 1 paper, each with its answer.
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- years asked, 2017–2026
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- of Electromagnetic Waves
- 2.04%
Concepts tested
- equal contribution of E and B to intensity
All Questions
2020 1 question
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The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is: ($c$ = speed of electromagnetic waves)In an electromagnetic wave, the energy densities of the electric and magnetic fields are equal: $\frac{1}{2}\epsilon_0E^2 = \frac{B^2}{2\mu_0}$ So half of the intensity is provided by the electric field and half by the magnetic field. Required ratio = 1 : 1