An electromagnetic wave is travelling in a medium with a velocity `vecv=vhati` with the electric field oscilating along the y-axis
In which direction the magnetic field oscillates?
(b) What is the relation between the amplitude of the electric and magnetic fields?

Options

A. along y-axis an `B_(0)=(E_(0))/C`
B. along z-axis and `B_(0)=(E_(0))/C`
C. along z-axis and `B_(0)=E_(0)-C`
D. along z-axis and `B_(0)=E_(0)C`

Answer

B

Explanation

(a) Since electric and magnetic fields are perpendicular to each other.
Therefore magnetic field oscillations are taking place along z-axis.
(b) The magnitude of the electric field `(E_(0))` and magnetic field `(B_(0))` in an electromagnetic wave are related as `B_(0)=(E_(0))/C`