JEE Main202523 Jan 2025Evening ShiftPhysicsElectromagnetic WavesActual
A plane electromagnetic wave of frequency 20 MHz travels in free space along the +x direction. At a particular point in space and time, the electric field vector of the wave is E _y=9.3 Vm ⁻¹ . Then, the magnetic field vector of the wave at that point is
Options
- AB _z=6.2 10⁻⁸ ~T
- BB _z=3.1 10⁻⁸ ~T
- CB _z=1.55 10⁻⁸ ~T
- DB _z=9.3 10⁻⁸ ~T
Correct answer
B. B _z=3.1 10⁻⁸ ~T
Step-by-step solution
aligned & E = BC & 9.3= B 3 10^8 & ~B = 9.3 3 10^8 =3.1 10⁻⁸ ~T aligned