In an $EM$ wave propagating along the $X-$ direction,the magnetic field oscillates at a frequency of $3 \times 10^{10} \, Hz$ along the $Y-$ direction and has an amplitude of $10^{-7} \, T$. The expression for the electric field will be:

• A
  $E_z = 30 \sin 2\pi (100x - 3 \times 10^{10} t) \, V/m$
• B
  $E_z = 300 \sin 2\pi (100x - 3 \times 10^{10} t) \, V/m$
• C
  $E_y = 30 \sin 2\pi (100x - 3 \times 10^{10} t) \, V/m$
• D
  $E_z = 300 \sin 2\pi (100x - 3 \times 10^{10} t) \, V/m$