First slide

Nature of electromagnetic wave

Question

A plane electro magnetic wave is propagating through space. It at any instant of time $\vec{E} = E_{0} \sin (ω t - k x) \hat{j}$ and $\vec{B} = - B_{0} \sin (ω t - k x) \hat{k}$ , the wave is carrying energy along

Easy

A

positive y-axis
B

negative x-axis
C

positive z-axis
D

positive x-axis

Solution

Direction of propagation of wave is same as the direction of $\vec{E} \times \vec{B}$ . Direction of $\vec{E} \times \vec{B}$ is $\hat{j} \times (- \hat{k}) = - \hat{i} \Rightarrow$ along negative x-axis.

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