JEE MAIN - Physics (2021 - 16th March Morning Shift - No. 13)
For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (Ue) and magnetic (Um) fields is :
Ue = Um
Ue $$\ne$$ Um
Ue < Um
Ue > Um
Giải thích
In EMW, average energy density due to electric field (Ue) and magnetic field (Um) is same.