A plane electromagnetic wave having a frequency $n = 23.9\, GHz$ propagates along the positive $z-$ direction in free space. The peak value of the electric field is $60\, V/m$. Which among the following is the acceptable magnetic field component in the electromagnetic wave?

• A

  $\vec B = 2 \times {10^{ - 7}}\,\sin \,\left( {1.5 \times {{10}^2}x + 0.5 \times {{10}^{11}}t} \right)\hat j$

• B

  $\vec B = 60\,\sin \,\left( {0.5 \times {{10}^3}x + 1.5 \times {{10}^{11}}t} \right)\hat k$

• C

  $\vec B = 2 \times {10^{ - 7}}\,\sin \,\left( {0.5 \times {{10}^2}z - 1.5 \times {{10}^{11}}t} \right)\hat i$

• D

  $\vec B = 2 \times {10^{7}}\,\sin \,\left( {0.5 \times {{10}^3}z + 1.5 \times {{10}^{11}}t} \right)\hat i$