JEE Main20249 Apr 2024Morning ShiftPhysicsElectromagnetic WavesActual
A plane EM wave is propagating along x direction. It has a wavelength of 4 ~mm . If electric field is in y direction with the maximum magnitude of 60 Vm ⁻¹ , the equation for magnetic field is :
Options
- AB _z=2 10⁻⁷ [ 2 10^3 (x-3 10^8 t ) ] k T
- BB _z=60 [ 2 (x-3 10^8 t ) ] k T
- CB _x=60 [ 2 (x-3 10^8 t ) ] i ~ T
- DB _z=2 10⁻⁷ [ 2 (x-3 10^8 t ) ] k T
Correct answer
A. B _z=2 10⁻⁷ [ 2 10^3 (x-3 10^8 t ) ] k T
Step-by-step solution
E = BC 60= B 3 10^8 B =2 10⁻⁷ Also C = f aligned & 3 10^8= f 4 10⁻³ & f = 3 4 10¹¹ & =2 f = 3 4 2 10¹¹ & = 2 10^3 C aligned Electric field y direction Propagation x direction Magnetic field z -direction