A plane electromagnetic wave of frequency 25 GHz is propagating in vacuum along the z-direction. At a particular point in space and time, the magnetic field is given by $\overline{\mathrm{B}}=5 \times 10^{-8} \hat{\mathrm{j}} T$. The corresponding electric field $\overrightarrow{\mathrm{E}}$ is (speed of light $\mathrm{c}=3 \times 10^8 \mathrm{~ms}^{-1}$ )