A) \[6\times {{10}^{-8}}T\] along z-direction
B) \[6\times {{10}^{-8}}T\] along x-direction
C) \[2\times {{10}^{-8}}T\] along z-direction
D) \[2\times {{10}^{-8}}T\] along y-direction
Correct Answer: C
Solution :
The direction of propogation of an EM wave is direction of \[\vec{E}\times \vec{B}.\] \[\hat{i}=\hat{j}\times \hat{B}\]\[\Rightarrow \]\[\hat{B}=\hat{k}\] \[C=\frac{E}{B}\Rightarrow B=\frac{E}{C}=\frac{6}{3\times {{10}^{8}}}\] \[B=2\times {{10}^{8}}T\] along z direction.
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