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Q4. One of the following statements is a correct interpretation of Poynting's theorem - which one?...

Q4. One of the following statements is a correct interpretation of Poynting's theorem - which one?

(A) The decrease in energy within the electric and magnetic fields over a certain volume always has the same magnitude as the energy that flows away from the volume.

(B) The work that the electromagnetic force exerts on a configuration of charges over a certain volume, has the same magnitude as the decrease in energy within the electric and magnetic fields over this volume - plus the energy that is flowing away from the volume.

(C) The energy within the electric and magnetic fields over a certain volume can only fluctuate if energy flows away from or into this particular volume.

_____________________________________________

Thank you in advance!

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