Q.

In an electromagnetic wave the electric and magnetizing fields are 100 V/m and  0.265A/m. The maximum rate of energy flow is

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a

26.5 Wm−2

b

36.5 Wm−2

c

46.7 Wm−2

d

76.5 Wm−2

answer is A.

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Detailed Solution

Amplitude of electric field,  E0=100V/mAmplitude of magnetizing field  H0=0.265 A/mThe maximum rate of energy flow is poynting vector   =E0B0μ=E0×H0=100×0.265           ∴ S=26.5 Wm−2
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In an electromagnetic wave the electric and magnetizing fields are 100 V/m and  0.265A/m. The maximum rate of energy flow is