JEE Main 2019 Physics question
A plane electromagnetic wave having a frequency ν = 23.9 GHz propagates along the positive z-direction in free space. The peak value of the Electric Field is 60 V/m. Which among the following is the acceptable magnetic field component in the electromagnetic wave?
Answer: (D)
Solution
T, ω = 1.5 × 10 rad/s, k = ω/c = 500 m; +z propagation needs (kz − ωt) and B ⊥ z.