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Q.

The average value of electric energy density in an electromagnetic wave is (E0 is peak value)

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a

12ϵ0E02

b

E022ϵ0

c

ϵ0E02

d

14ϵ0E02

answer is D.

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Detailed Solution

Electric energy densityue=12ε0Erms2Erms=E02∴ue=14ϵ0E02
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