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  • An electromagnetic wave is transposing energy in the negative y – direction. At one point and one instant the magnetic field is in the positive x – direction. The electric field at that

An electromagnetic wave is transposing energy in the negative y – direction. At one point and one instant the magnetic field is in the positive x – direction. The electric field at that point and instant in:

Option: 1

positive y – direction


Option: 2

negative y – direction


Option: 3

positive z – direction


Option: 4

negative z – direction


Answers (1)

best_answer

In an electromagnetic wave, the direction of energy flow is along the direction of the wave propagation. Therefore, the wave propagates along negative y - direction. Magnetic field (\overrightarrow{\mathrm{B}}) is along the positive x- direction and the wave propagates along negative y- direction. Therefore, electric filed (\overrightarrow{\mathrm{E}}) should be in a direction perpendicular to both x and y-axes. Using vector algebra \mathrm{\vec{E} \times \vec{B}} should be along negative y- direction.
Since \mathrm{(-\hat{\mathrm{j}})=(-\hat{\mathrm{k}}) \times(\hat{\mathrm{i}}), } \overrightarrow{\mathrm{E}} is along negative z- direction.

Hence option 4 is correct.

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