1.

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)]

Answer»

`2.38xx10^(6)`
`1.19xx10^(6)`
`6xx10^(5)`
`4.76xx10^(6)`

SOLUTION :`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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