Question

Write the relation for the speed of electromagnetic waves in terms of the amplitudes of electric and magnetic fields.

Answer 1

${\epsilon }_x={\epsilon }_0\sin (wt-kz)$ (general equation)

$B_y=B_0\sin (wt-kz)$

Electrical field and magnetic field are perpendicular to each other.

$ϵM$ wave travels in direction of $=\overrightarrow{\epsilon }\times \overrightarrow{B}$

$C=$ speed of $ϵM$ wave

${ϵ}_0=$Amplitude of electric field

$C=\frac{{ϵ}_0}{B_0}$

$B_0$ = amplitude of magnetic field.