Question

The energy transported by the fields per unit time per unit are is called __________

(a) Poynting Energy

(b) Electro-magnetic energy

(c) Poynting vector

(d) Flux density

I had been asked this question during an online interview.

The question is from Poynting Theorem in chapter Electrodynamics of Engineering Physics II

Answer 1

Right option is (c) Poynting vector

For explanation: The work done on the charges by an electromagnetic field is equal to the decrease in energy stored in the field less the energy that flowed out through the surface. This energy, that is transported by the fields, per unit are per unit time is called Poynting vector.