What is the general idea around which passage 2 revolves?

Answer the question based on the following passages.

Passage 1

            Wood was initially the sole heat energy provider. Later coal
            energized the western industry and finally came fuels like
            petroleum and natural gas to ignite the industrial sector. The
            triggered demand of energy has been due to boom in
(5)        modern luxuries like kitchen gadgets, air conditioners, heat
            pumps and the futuristic electric cars. So, to execute
            uninterrupted supply of energy, many coal fired and nuclear
            power plants have been set up. Even electric generators work
            with turbines to give hydroelectricity. Today electricity stands
(10)      distinctively as the most predominant energy provider. The
            oiling of kerosene lamps, hearth fires and cool iceboxes all are
            outdated. Now townships are planned near waterfalls so that
            easy energy can be obtained.
            Benjamin Franklin introduced the subject ‘electricity’ and Thomas
(15)      Edison brightened human life by inventing the first electric bulb.
            The electric charge was produced by the positive charge of
            protons and negative charge of electrons, both present in an atom.
            Their attraction to each other helps produce electrical charge.
            So the universally known principle of the attraction of opposites
(20)      helped produce electricity.

Passage 2

            Study of magnets acquaints us with the energy field which
            surrounds it, within which we feel the force of these magnets.
            A bar magnet pulls a piece of iron placed 2 cm away. If the
            potency is stronger it can make the iron almost dance to its
(5)        tune. Hence, if the attraction occurs, we can derive that the
            iron piece falls within the magnetic field. This comprehension
            of an energy field was difficult to relate in the past but for
            scientists today the concept stands clear that magnetic poles
            apply a force within a limit called its field. Even the molecules
(10)      of a liquid and air can be magnetized. Electric charge and
            magnetic charge both exert their force in a field. This electric
            field has both magnitude and direction represented by lines
            force or field lines, which begin on positive charges and
            terminate on negative charge. If electric energy could be
(15)      exploited for human use, can’t magnetic energy be not
            similarly used?