The electric field in an electromagnetic wave is given as E =20 sin ω( t -x/c) j NC^-1 where ω and c are angular frequency and velocity of…

The electric field in an electromagnetic wave is given as $$\overrightarrow{\mathrm{E}}=20 \sin \omega\left(\mathrm{t}-\frac{x}{\mathrm{c}}\right) \overrightarrow{\mathrm{j}} \mathrm{NC}^{-1} $$ where $\displaystyle \omega$ and $\displaystyle c$ are angular frequency and velocity of electromagnetic wave respectively. The energy contained in a volume of $\displaystyle 5 \times 10^{-4} \mathrm{~m}^3$ will be (Given $\displaystyle \varepsilon_0=8.85 \times 10^{-12} \mathrm{C}^2 / \mathrm{Nm}^2$ )