Question: For free space show that electromagnetic ( EM ) wave is transverse in nature. Show that for free space, the total outward flux of EM

For free space show that electromagnetic $($ EM $)$ wave is transverse in nature.

Show that for free space, the total outward flux of EM energy through surface S bounding volume V is equal to the rate of loss of EM energy from the volume V $.$ A laser beam of $2$ mm diameter has average power of $20$ GW $.$ Calculate the peak values of electric and magnetic fields in the laser beam.

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