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According to the Poynting theorem, the energy flow per unit time out of any closed surface is ___________

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According to the Poynting theorem, the energy flow per unit time out of any closed surface is ___________

(a) Integral of S over the length of the surface

(b) Integral of S over the are of the surface

(c) Differential of S over the length of the surface

(d) Differential of S over the are of the surface
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Correct option is (b) Integral of S over the are of the surface

Easiest explanation: According to the pointing theorem, the energy flow per unit time out of any closed surface is the integral of S over the surface i.e., P = ∫S.da.
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