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The intensity of plane electromagnetic w...

The intensity of plane electromagnetic wave with `B_(0)=1.0xx10^(-4)T` is ….. `Wm^(-2)`.
`[c=3xx10^(8)ms^(-1), mu_(0)=4pi xx 10^(-7)NA^(-2)]`

A

`2.38xx10^(6)`

B

`1.19xx10^(6)`

C

`6xx10^(5)`

D

`4.76xx10^(6)`

Text Solution

Verified by Experts

The correct Answer is:
B
`B_(rms)=(B_(0))/(sqrt(2)) " " therefore B_(rms)^(2)=(B_(0)^(2))/(2)`
`c=3xx10^(8)m//s, B_(0)=1xx10^(-4)T`
`mu_(0)=4pi xx10^(-7)N//A^(2)`
Intensity `I=(cB_(rms)^(2))/(mu_(0))`
`therefore I=(cB_(0)^(2))/(2mu_(0))`
`therefore I=(3xx10^(8)xx10^(-8))/(2xx12.56xx10^(-7))=1.19xx10^(6)Wm^(-2)`
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