A) \[\left( \hat{i}+2\hat{j} \right)\]and\[\left( 2\hat{i}-\hat{j} \right)\]
B) \[\left( -2\hat{i}-3\hat{j} \right)\]and\[\left( 3\hat{i}-2\hat{j} \right)\]
C) \[\left( 2\hat{i}+3\hat{j} \right)\]and\[\left( \hat{i}+2\hat{j} \right)\]
D) \[\left( 3\hat{i}+4\hat{j} \right)\]and\[\left( 4\hat{i}-3\hat{j} \right)\]
Correct Answer: B
Solution :
[b] In propagation of light \[\vec{E}\]and \[\vec{B}\]oscillate in mutually perpendicular directions. |
\[\vec{E}\times \vec{B}=\]direction of propagation = +z direction only option [d] satisfies both conditions of [a] \[\vec{E}\times \vec{B}=0\] |
[b] \[\left( \vec{E}\times \vec{B} \right)\]directed along the z-axis. |
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