plane electromagnetic wave of frequency 500 MHz is travelling in vacuum along y-direction. At a particular point in space and time, $\vec{B}=8.0 \times 10^{-8} \hat{z} T$. The value of electric field at this point is : speed of light $\left.=3 \times 10^8 \mathrm{~ms}^{-1}\right)$
$\hat{\mathrm{x}}, \hat{\mathrm{y}}, \hat{\mathrm{z}}$ are unit vectors along $\mathrm{x}, \mathrm{y}$ and z direction.