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Q.

A plane electro-magnetic wave is propagating through space. If amplitude of electric field is Em, the average intensity of the wave is

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a

CEm22μ0

b

12μ0CEm2

c

12ε0Em2

d

12ε0CEm2

answer is D.

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Detailed Solution

Average energy density u=12ε0Em2∴ Average intensity I=uC=12ε0CEm2
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