The ratio of the magnitudes of the electric field to the magnetic field of an electromagnetic wave is of the order of

In a travelling plane electromagnetic wave,the maximum magnetic field is $1.26 \times 10^{-4} \ T$. The intensity of the wave is (Assume,$\mu_0 = 1.26 \times 10^{-6} \ H/m$)

The property which is not of an electromagnetic wave travelling in free space is that:

The electric and the magnetic field,associated with an electromagnetic wave propagating along the $+z$-axis,can be represented by

What is the amplitude of the electric field in a parallel beam of light of intensity $\left(\frac{15}{\pi}\right) \text{ W/m}^2$ (in $\text{ N/C}$)? $\left[\text{Assume} \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \text{ Nm}^2/\text{C}^2\right]$

The Poynting vector $\vec S$ is defined as a vector whose magnitude is equal to the wave intensity and whose direction is along the direction of wave propagation. Mathematically,it is given by $\vec S = \frac{1}{{\mu _0}}(\vec E \times \vec B)$. Show the nature of the $\vec S$ vs $t$ graph.