Em Waves Question 107

Question: In a wave $ E _{0}=100,V{{m}^{-1}} $ . Find the magnitude of Pointing’s vector

Options:

A) $ 13.25W{{m}^{-2}} $

B) $ 26.5W{{m}^{-2}} $

C) $ 18.25W{{m}^{-2}} $

D) $ 19.7W{{m}^{-2}} $

Show Answer

Answer:

Correct Answer: B

Solution:

[b] $ \vec{s}=\frac{E^{2}}{C{\mu _{0}}}=26.5,W{{m}^{-2}} $