COMEDK2023Morning ShiftPhysicsElectromagnetic WavesActual
A plane electromagnetic wave of frequency 20 ~MHz travels through a space along x -direction. If the electric field vector at a certain point in space is 6 ~Vm ⁻¹ , then what is the magnetic field vector at that point?
Options
- A2 ~T
- B2 10⁻⁸ ~T
- C1 2 10⁻⁸ ~T
- D1 2 ~T
Correct answer
B. 2 10⁻⁸ ~T
Step-by-step solution
The relationship between the magnitude of the electric field E and the magnetic field B in an electromagnetic wave is given by E = cB , where c is the speed of light in vacuum. Given E = 6 ~Vm ⁻¹ and c = 3 10^8 ~ms ⁻¹ . The magnitude of the magnetic field B is calculated as: B = E c = 6 3 10^8 ~T B = 2 10⁻⁸ ~T Answer: 2 10⁻⁸ ~T