AP EAMCET20225 Jul 2022Evening ShiftPhysicsElectromagnetic WavesActual
A plane electromagnetic wave of frequency 50 MHz travels in free space. If the average energy densities in the electric field and magnetic field are K _ E and K _ B respectively, then the correct option in the following is
Options
- AK _ E = K _ B
- BK _ E = K _ B =0
- CK _ E > K _ B
- DK _ E < K _ B
Correct answer
A. K _ E = K _ B
Step-by-step solution
K _ E = 1 2 ₀ E ₀^2= 1 2 ₀ ~B ₀^2 C ^2= 1 2 ₀ B₀^2 1 ₀ ₀ = B₀^2 2 ₀ =K_B