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The electric and magnetic field, associated with an E.M wave propagating along the + z axis, can be represented by

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$[\vec{E} = E_{0} \hat{j,} \vec{B} = B_{0} \hat{k}]$

$[\vec{E} = E_{0} \hat{i,} \vec{B} = B_{0} \hat{j}]$

$[\vec{E} = E_{0} \hat{k,} \vec{B} = B_{0} \hat{i}]$

$[\vec{E} = E_{0} \hat{j,} \vec{B} = B_{0} \hat{i}]$

answer is B.

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Detailed Solution

$\vec{E} \times \vec{B}$ points in the direction of wave propagating

As the direction of propagation is along +z-axis, $[\vec{E} = E_{0} \hat{i,} \vec{B} = B_{0} \hat{j}]$ is the possible direction of electric field and magnetic field.

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