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Question
An electromagnetic wave passes through space and its equation is given by E = E0 sin(ω - kx) where E is electric field. Energy density of electromagnetic wave in space is ______.
Options
`1/2epsilon_0"E"_0^2`
`1/4epsilon_0"E"_0^2`
`epsilon_0"E"_0^2`
`2epsilon_0"E"_0^2`
MCQ
Fill in the Blanks
Solution
An electromagnetic wave passes through space and its equation is given by E = E0 sin(ω - kx) where E is electric field. Energy density of electromagnetic wave in space is `underlinebb(1/2epsilon_0"E"_0^2)`.
Explanation:
Energy density (EM waves)
= `epsilon_0"E"_"rms"^2`
= `epsilon_0("E"_0/sqrt2)^2`
= `1/2epsilon_0"E"_0^2`
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Energy Density of a Magnetic Field
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