The electric field of a plane electromagneyic wave propagating along the x direction in vacuum is \vec{E}=E_{0}\; \hat{j}\cos (\omega t-kx) . The magnetic field \vec{B}, at the moment t=0 is :
Option: 1 \vec{B}=\frac{E_{0}}{\sqrt{\mu _{0}\epsilon _{0}}}\cos (kx)\hat{k}  
Option: 2 \vec{B}=E_{0}\sqrt{\mu _{0}\epsilon _{0}}\cos (kx)\hat{j}
Option: 3 \vec{B}=E_{0}\sqrt{\mu _{0}\epsilon _{0}}\cos (kx)\hat{k}
Option: 4 \vec{B}=\frac{E_{0}}{\sqrt{\mu _{0}\epsilon _{0}}}\cos (kx)\hat{j}

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