Q. In an electromagnetic wave, the electric and magnetizing fields are $100\ Vm^{- 1}$ and $0.265\ Am^{- 1}$. The maximum energy flow is
A) $26.5\ Wm^{- 2}$
B) $36.5\ Wm^{- 2}$
C) $46.7\ Wm^{- 2}$
D) $765\ Wm^{- 2}$
Explanation
(a) Here, amplitude of electric filed, $E_{0} = 100\ Vm^{- 1}$; amplitude of magnetic field, $B_{0} = 0.265\ Am^{- 1}$. We know that the maximum rate of energy flow
$S = E_{0} \times B_{0} = 100 \times 0.265 = 26.5\ Wm^{- 2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.