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Poynting vector gives the energy flow per unit area per unit time through a cross-sectional area along the direction of propagation of the wave.

(a) True

(b) False

I got this question during an online exam.

This intriguing question comes from Poynting Theorem topic in division Electrodynamics of Engineering Physics II

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Correct answer is (b) False

Easy explanation: The Poynting vector is in the direction of the propagation of the wave. However, the cross-sectional area through which the energy is flowing out is perpendicular to the direction of propagation of wave.

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