you are: Magnetism and an electricity
Therefore Franklin consider as the inventor of a lightning rod though the first lightning rod has been designed in 1752 by Frenchman Dalibarom.
Communication between an electricity and processes in live organisms has allowed to make even more remarkable opening in other area of physics - in the doctrine about electric currents.
How between charges force of an attraction or pushing away depends on size of charges and from distance between them? The second question was answered with the French scientist Charles Ogjusten Kulon (1736-1806).
The First researches of Kulon has devoted to the applied mechanics: prosecuted subjects of resistance of materials, in particular the laws operating at torsion of hair, silk threads, and, at last, thin metal provolok. Result of these researches was the device of an original design. It consisted of the glass cylinder on which circle the angular scale has been put. The cylinder, besides, had a special cover. In its centre there was an aperture into which the glass tube was inserted, through it in the cylinder the silver thread has been passed, on a thread the easy glass lever is suspended, and on its end there was a ball. Through a lateral aperture in cylinder Kulon cover entered inside a core with a ball on the end. Now, if both balls received an electric charge, the forces which have resulted interaction of these charges, caused turn of a silver thread on a corresponding corner which could be defined easily on an angular scale.
Making these experiments at first with identical, and later with different electric charges, Kulon has formulated the electricity organic law according to which the absolute size of force of pushing away of two with the same name or attractions of two heteronymic charges is directly proportional to product of sizes of these charges and inversely proportional to a distance square between them. (It is necessary to notice that today this law is considered ' correct ' for charges dot, that is hypothetically concentrated in one geometrical point.) Kulon has given the formulation of the similar law defining quantitative dependences of mutual influence of magnetic charges.