An em wave is propagating in a medium with a velocity . The instantaneous oscillating electric field of this em wave is along axis. Then the direction of oscillating magnetic field of the em wave will be along:
- Adirection
- Bdirection
- Cdirection
- Ddirection
Solution & Step-by-step Explanation
The direction of propagation of an electromagnetic wave is given by the vector cross product .Velocity direction () = .Electric field direction () = .We need .Using the unit vector cross products: .Therefore, the magnetic field must be along the direction.