What exactly does the statement of poynting theorem mean physically?
The Poynting Theorem is a fundamental concept in electromagnetism that describes the relationship between electric and magnetic fields and the flow of energy through space.
The Poynting Theorem physically means that the energy transported by electromagnetic waves is proportional to the product of the electric field and the magnetic field, and is directed perpendicular to both fields.
The Poynting Theorem is derived from Maxwell's equations, which are a set of four equations that describe the behavior of electric and magnetic fields. It can also be derived from the Lorentz force law.
The Poynting Theorem has many practical applications, including understanding how energy is transferred in electrical circuits, analyzing the behavior of electromagnetic waves, and predicting the effects of electromagnetic radiation on matter.
The Poynting Theorem is closely related to the law of conservation of energy, as it describes the transfer of energy through electromagnetic fields. It states that the total energy in a closed system remains constant, and energy can be neither created nor destroyed, only transformed.