Question

The ratio of average electric energy density and total average energy density of electromagnetic wave is:

• A. 2
• B. 3
• C. $\frac{1}{2}$
• D. 1

Answer 1

Answer: (C)

$<u_E>=<u_B>=\frac{1}{2}<u_{\text{total }}>$
So $\frac{⟨u_E⟩}{⟨u_{\text{total }}⟩}=\frac{1}{2}$