In this work, we demonstrate explicitly the unified nature of electric and
magnetic fields, from the principles of special relativity and Lorentz transformations
of the electromagnetic field tensor. Using an operational approach we construct the
tensor and its corresponding transformation law, based on the principle of relativity.
Our work helps to elucidate concepts of advanced courses on electromagnetism for
primary-level learners and shows an alternative path to derive the Lenz’s law based 
on the connection between relativity arguments and a standard electromagnetism
experiment.