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Energy in Electromagnetic field?

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Find the intensity of an electromagnetic wave having a peak magnetic field strength of 4.00*10^-9 T.

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  1. The electromagnetic wave intensity is:

    S = cB² / µ₀

    = ((3.00 x 10^8 m/s) x (4.00 x 10^-9 T)²) / (4π x 10^-7 Tm/A)

    = 3.82 x 10^-3 W/m²

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