A plane electromagnetic wave is travelling along +y-axis. The value of electric field at a point is $\vec E=12.3\hat i\frac{N}{C}$ The magnitude and direction of magnetic field B at this point is:

$4.1 × 10^{-8} T$, along -z axis $4.1 × 10^{-8} T$, along +z axis $36.9× 10^8 T$, along -z axis 12.3 T, along +z axis

$4.1 × 10^{-8} T$, along -z axis

The correct answer is Option (1) → $4.1 × 10^{-8} T$, along -z axis