The quasilinear generator and ∫B⋅dS=0

At the undergraduate level, it is often easier to measure electrical magnitudes than magnetic ones. Working within the framework of classical electromagnetism (i.e., without referring to massive photons or to hypothetical magnetic monopoles) we develop an inexpensive and easy-to-use device capable of verifying a fundamental property of the magnetic flux density as applied to free space, ∫B⋅dS=0, to better than 5 parts per million accuracy. In order to achieve the above purpose, we make a slight variant of our former quasilinear generator. Gauss’s theorem ensures that div B=0 for empty space to the same accuracy as above.