The relation between electric field E and magnetic field induction B in an electromagnetic waves

The relation between electric field E and magnetic field H in an electromagnetic wave is

The electric and magnetic field of an electromagnetic wave is

The electric and magnetic field of an electromagnetic wave are:

Out of electric field vector, vec(E) and magnetic field vector, vec(B) in an electromagnetic wave, which is more effective and why ?

Write the relation between the following: (a) Direction of propagation and directions oscillation of the electric and magnetic field vectors in an electromagnetic wave. (b) Velocity of the electormagnetic wave in vacuum and the permeability and permittivity of free space.

The energy associated with electric field is (U_(E)) and with magnetic field is (U_(B)) for an electromagnetic wave in free space. Then :