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An electric field in an e.m.wave is give...

An electric field in an e.m.wave is given by
`E=200 sin .(2pi)/lambda(ct-x)NC^-1`.
Find the energy contained in a cylinder of crossection `20 cm^2` and length 40 cm along the x-axis.

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The correct Answer is:
`22 xx 10^(-11)J`
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