High Quality Content by WIKIPEDIA articles! In physics, the weber is the SI unit of magnetic flux. A Flux density of one Wb/m2 (one weber per square meter) is one tesla. IT is named after the German physicist Wilhelm Eduard Weber (1804 ? 1891). THe weber may be defined in terms of Faraday's law, which relates a changing magnetic flux through a loop to the electric field around the loop. A Change in flux of one weber per second will induce an electromotive force of one volt.