1.

In a travelling plane electromagnetic wave, the maximum magnetic field is 1.26xx 10^(-4) T . The intensity of the wave is (Assume, mu_0 = 126 xx 10^(-6) H//m)

Answer»

`1.56 xx 10^6 (W)/(m^2)`
`1.89 xx 10^6 (W)/(m^2)`
`8.92 xx10^6 (W)/(m^2)`
`4.62 xx 10^6 (W)/(m^2)`

Solution :GIVEN , MAXIMUM magnetic field ,
`B_0 = 1.26 xx 10^(-4) t`
` mu_0 = 1.26 xx 10^(-6) H//m`
` therefore ` Intensity of EMW (Electromagnetic wave) is given by
`I = 1/2 (B_0^2 C)/(mu_0) = 1/2 xx( (1.26 xx 10^(-4) )^2 xx 3 xx 10^8)/(1.26 xx 10^(-6) ) `
` =1/2 xx (1.26 xx 1.26 xx 10^(-8) xx 3 xx 10^8)/(1.26 xx 10^(-6) )`
`= 0.63 xx 3 xx 10^6 = 1.89 xx 10^6 W//m^2`


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