Some other discoveries were from the Greeks. Two millennia ago, Greeks
noticed that, when a material was amber rubbing with animal fur, it attracted
small pieces of leaves and dust. This processing is said to be charged. Some other
people thought that the amber had a special property but later they understood
and found that not only amber but even a glass rod rubbed with silk cloth, attracted
pieces of paper. So that Greeks finally understood of some other materials
having charged while they’re rubbed with silk, fur and so and so.
Therefore, two kinds of charges exist
in the universe. Benjamin Franklin segregated the charge concept into
positive and negative charges. In the 18th
century, Benjamin Franklin called one type of charge positive and another
type of charge negative. He segregates that as its material changes. Based on
Franklin’s convention, rubber and amber rods are negatively charged while the
glass rod is positively charged. If the net charge is zero in the object, it is
said to be electrically neutral.
Finally, J. J.
Thomson and E. Rutherford, search works are used to find today’s charge concepts.
Nowadays we understand that the atom is electrically neutral and is made up of negatively charged electrons, positively charged protons, and neutrons
which have zero charge. Some amount of charge is transferred from one object to
another due to the friction between them and the object is then said to be
electrically charged.
Charging the objects through rubbing is called triboelectric
charging.
