Lecture 2 The Electric Field Prepared By Dr

Lecture (2) The Electric Field Prepared By Dr. Badry N Abdalla 2019 -2020

History Michael Faraday (1791– 1867) was the son of a blacksmith, and started his career as a bookbinder’s apprentice. He used the opportunity to read many books on science. He became interested in chemistry and physics. Faraday proposed our the electric field. of concept current

Faraday never had the proper education given to an English gentleman. As such, his mathematical skills were basic. However, he was a brilliant experimentalist. He discovered, or laid the ground work for, electric and magnetic fields, electromagnetic induction, diamagnetism, the laws of electrolysis, electrochemistry (he popularized the terms ion, anode, cathode, and electrode), electric motors and generators, and organic chemistry (he discovered benzene for example). He has not one but two units named for him — the farad (F), the unit of capacitance, and the faraday, the charge of one mole of electrons. (1 faraday = 96485 C)

Field lines Faraday imagined invisible lines of electrical force emanating from charged particles or metal plates. The convention is to imagine a positive test charge within the field. It will move along a path toward a negative charge, or away from a positive charge. + q q 0 F F q + q 0