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The magnetic field in a plane electromagnetic wave is given by:

   By = 12×10-8 sin1.20×107 z + 3.60×1015 t T. Calculate the

   (i)Energy density associated with the Electromagnetic wave

   (ii)Speed of the wave

Explanation:

(i) Energy density U = B2μ0        (1/2) mark

u= 11.5 X 10-9 J/m3.              (1/2) mark

(ii) Speed = ωk                      (1/2) mark

    speed= 3 X 108 m/s           (1/2) mark

 

 

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