The magnetic field in a plane electromagnetic wave is given as $B = (3 \times 10^{-7} \text{ T}) \sin (3 \times 10^4 x + 9 \times 10^{12} t) \hat{j}$. The electric field of this wave is given as:

• A
  $90 \sin (3 \times 10^4 x + 9 \times 10^{12} t) \hat{i} \text{ Vm}^{-1}$
• B
  $90 \sin (3 \times 10^4 x + 9 \times 10^{12} t) \hat{k} \text{ Vm}^{-1}$
• C
  $45 \sin (3 \times 10^4 x + 9 \times 10^{12} t) \hat{i} \text{ Vm}^{-1}$
• D
  $45 \sin (3 \times 10^4 x + 9 \times 10^{12} t) \hat{k} \text{ Vm}^{-1}$