Optics Question 299
Question: In an electromagnetic wave, the electric and magnetising fields are $ 100V{{m}^{-1}} $ and $ 0.265A{{m}^{-1}} $ . The maximum energy flow is
[Pb. PMT 1997, 98]
Options:
A) $ 26.5W/m^{2} $
B) $ 36.5W/m^{2} $
C) $ 46.7W/m^{2} $
D) $ 765W/m^{2} $
Show Answer
Answer:
Correct Answer: A
Solution:
Here $ E _{0}=100\ V/m, $
$ B _{0}=0.265\ A/m. $
Maximum rate of energy flow S = $ E _{0}\times B _{0} $ = $ 100\times .265=26.5\frac{W}{m^{2}} $
