Questions
A point source of electromagnetic radiation has an average power output of . The maximum value of electric field at a distance of 3m from this source in is
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a
10
b
20
c
15
d
5
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Correct option is A
I=P4πr2=12∈0E02C ⇒E0=P2πr2∈0c12 ⇒E0=152π×9×3×1084π×9×10912 ⇒E0=10212=10VmSimilar Questions
In an electromagnetic wave, the electric and magnetising fields are and . The maximum energy flow is
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